Solutions Of Complexes Research Articles

CuII-Hfur–imidazole] compounds as precursors of efficient hydrogenation and reductive alkylation catalysts in flow systems

The reaction of copper(II) acetate with furoic acids (2Hfur / 3Hfur) and imidazole (Im) in methanol resulted in mononuclear complexes [Cu(fur)2(Im)2(H2O)]·L (fur- = 2fur- (1, 2), 3fur- (3); L = MeCN (1)) whose structures were determined by direct single crystal X-ray analysis. It was found for the first time that copper nanoparticles immobilized on the surface of γ-Al2O3 obtained by chemical reduction of 1, 2 and 3 (pre-deposited on the surface from solution) with sodium tetrahydroborate show high selectivity of mono- and dihydrogenation of tricyclo[5.2.1.02,6]deca-3,8-diene (dicyclopentadiene, DCPD). The catalytic activity tests show a high selectivity (97 %) of the catalyst obtained from an ethanolic solution of complex 1 in the reaction of partial hydrogenation to DHDCPD under continuous process conditions even at high conversion values (up to 96 %) and with an excess of hydrogen, whereas the catalyst obtained from an aqueous solution of complex 1 showed 98 % total hydrogenation product (THDCPD) selectivity. The catalysts based on all the complexes 1–3 were successfully used in reactions of nitrobenzene (NB) reduction to aniline (AN) and in the reductive alkylation of nitrobenzene with isobutanol (i-BAN) 100 % yields of aniline and N-isobutylaniline were obtained at LHSV 0.16 h−1.

Cationic cluster complex [{Mo6I8}(H2O)4(OH)2]2+ with diphenyl phosphate anions: Structure and optical properties behavior

The interaction of an aqueous solution of the cluster complex [{Mo6I8}(H2O)4(OH)2](NO3)2 with an excess of diphenyl phosphoric acid in ethanol leads to the formation of a light orange insoluble crystalline product. According to the single-crystal X-ray diffraction analysis, the crystals obtained have the composition [{Mo6I8}(H2O)4(OH)2]((PhO)2PO2)2·6H2O·2EtOH·2(PhO)2PO2H. The inclusion of such large molecules as diphenyl phosphate into the structure leads to a dramatic decrease in the packing density of cluster fragments. The study of the optical properties of the obtained compound showed that such a decrease in the density leads to a decrease in absorption and a hypsochromic shift of the absorption edge. At the same time, there is a significant increase in the luminescence intensity accompanied by a blueshift of the emission maximum in comparison with the initial compound and other related clusters.

Conceptual Foundations of Information Modeling Technology in Urban Planning

Introduction. For the management of complex urban planning systems, the problems of choosing alternatives and finding effective solutions under conditions of risk and uncertainty in the interaction of many exogenous and endogenous factors are of great theoretical and practical importance. A special place in decision-making is occupied by an integrated approach that allows, based on artificial intelligence models, expert assessment, analytical and computational models, modeling methods and a number of other models and methods, to successfully apply various approaches to decision support, to provide a deeper and more comprehensive account of various factors. , their relationship, act in conditions of semistructured or unstructured information about the control object. In this regard, the problem of creating integrated intelligent decision support systems based on the theory and principles of hybrid artificial intelligence systems, mathematical modeling methods, system analysis, synthesis of control actions, etc. is relevant.The purpose of this article is to clarify the conceptual foundations of information modeling technology in urban planning.Materials and methods. To achieve this goal, the article used methods of problem analysis, synthsis, scientific approaches to solving the stated problem, classification of hybrid models used in information modeling in urban planning. The materials of the article are the works of scientists on the stated issues.Research results. The article points out that the possibilities of modeling in urban planning are associated with the development of hybrid models, which are models that are built using various methods. The author determined that a hybrid intelligent system is a combination of: analytical models, expert systems, artificial neural networks, fuzzy systems, genetic algorithms, simulation statistical models. The main task in the development of hybrid systems is to best combine different forms of representation and methods of knowledge processing in the decision-making process in the field of urban planning.Discussion and conclusion. The article substantiates the importance of introducing hybrid models for studying the functioning and forecasting the development of urban infrastructure. Approaches to the creation of intelligent information systems for decision support in urban planning based on a combination of analytical methods and models, such as simulation modeling, computational calculations, optimization calculations with soft computing models, such as fuzzy systems, neural networks, genetic solutions of complex weakly structured or unstructured tasks. The creation of such systems will increase the level of managerial decision-making in urban planning, better assess the quality of the housing policy being pursued.

Spectro-luminescent characterization of molecular complex based on tryptanthrin for design of new effective drugs

Optical absorption (at room temperature), fluorescence (at room temperature and T = 78 K) and phosphorescence (at T = 78 K) spectra of solution of the molecular complex based on tryptanthrin with platinum chloride and DMSO [Pt(Try)(DMSO)Cl2] (Try-Pt) was investigated. The positions of the first excited singlet (S1) and triplet (T1) energy levels were obtained. It was shown that in the excited state intramolecular singlet excitations energy transfer inside tryptanthrin π-electron system between two centers of optical absorption (that absorb equally) exists. It was found out the optical response of toxic influence of platinum chloride on tryptanthrin π-electron system inside this molecular complex as it is shown by us for a number of polynucleotides. Contrary to singlet energy transfer no intramolecular triplet electronic excitations energy transfer inside tryptanthrin π-electron system between both optical centers is observed. Taking into account the facts that such complexes can easy bind to telomeric G4 DNA the studied phenomena can be used for the design of new effective antitumor and anti-inflammatory drugs.

COMPARATIVE STUDY OF THE RHEOLOGICAL BEHAVIOR OF SOLUTIONS OF THE CHITIN-GLUCAN COM-PLEX FROM THE FRUIT BODIES OF ARMILLARIA MELLEA IN ACETIC AND HYDROGENIC ACID

The article is devoted to the study of the rheological properties of the chitin-glucan complex (CGC) in aqueous solutions of hydrochloric and acetic acids. The CGC sample was isolated from the fruiting bodies of the Armillaria mellea, biotechnologically obtained from an easily renewable plant material. The flow of solutions of chitin-glucan complex with a concentration of 1, 5, 10% (wt.) in hydrochloric acid and 1, 3, 5% (wt.) in acetic acid was studied by the method of rotational viscometry in the range from 10 s-1 to 1000 s-1 at temperatures from 20°C to 50°C. The values of the rheological coefficients of the Ostwald equation are determined. The phenomena of non-Newtonian viscosity anomalies are established. The high viscosity of solutions may be due to the presence of an internal supramolecular structure in solutions of the chitin-glucan complex. The predominantly pseudoplastic nature of the rheological behavior of the studied solutions is shown. The flow index in this case varies from 0,18 to 0,79 for solutions of the chitin-glucan complex in hydrochloric acid and from 0,01 to 0,47 in solutions of acetic acid with a concentration of 3 to 5% (wt.). The pseudoplastic flow mechanism of such solutions can be explained by the destruction of the internal structure of the solution with an increase in shear loads. The dilatant nature of the flow of CGC solutions in acetic acid at a concentration of 1% (wt.) at a shear rate of 10 to 100 s-1 was also revealed. The flow index in this case ranges from 1,28 to 1,57. The dilatant nature of the flow may be due to the predominance of the processes of formation of a new internal structure in solution over the destruction of the existing structure in solution at a low concentration of the chitin-glucan complex. The influence of temperature on the rheological behavior of solutions is strongly distorted by the influence of other factors.

Linking surface tension to water polarization with a new hypothesis: The Ling-Damodaran Isotherm.

Studying aqueous solutions of complex (bio)polymers is essential from both theoretical and practical perspectives. To understand the principles that govern the properties of these solutions is pivotal for the study of biological processes, considering that the most distinguished components of the cells are polymers (proteins, nucleic acids). These macromolecular aqueous systems, known as colloids, has raise the interest of scientists in recent years. It is known that several physicochemical properties deviate from ideal behaviour in this kind of solutions and that the physical state of water is different compared to its pure state. Particularly, the surface tension of such mixtures often shows a peculiar profile at semi-dilute and concentrated conditions. Here, we joined the colloidal concept of water polarization (proposed in the Association-Induction Hypothesis) with Damodaran's formalism for surface tension to theoretically derive a compelling mathematical model that explains the behaviour of polymer solutions. We measured the surface tension and osmolarity of different polyethylene oxide solutions and we used the ACDAN fluorescence probe to assess the water dipolar relaxation (polarization) in these mixtures. As a proof of concept, we also studied the influence of these polymer solutions on lipid interfaces. Our isotherm model explains the experimental observations with a unifying view that correlates with other measured properties, such as osmolarity and water dipolar relaxation. This provides a link between interfacial and bulk physicochemical properties of polymer solutions, also giving a new framework for studying the interaction of colloidal systems with lipid membranes interfaces.

ON OBTAINING BINARY POLYELECTROLYTE COMPLEXES OF CHITOSAN BOMBYX MORI WITH COLLAGEN

We obtained binary polyelectrolyte complexes containing chitosan from Bombyx mori and collagen with a mass ratio of 10:1; 10:2, and 10:3. During the interaction between the macromolecules, due to the compensation of the positive charges of chitosan with the negative charges of collagen, the zeta potential of the solutions of polyelectrolyte complexes changed from +15.2 to +5.67 mV. We revealed the dependence of the size characteristics of the particles of polyelectrolyte complexes on time and the ratio of macromolecules. An examination of the morphology of the films of polyelectrolyte complexes demonstrated that in the evaluated chitosan/collagen mass ratios, non-spherical nanosized particles up to ≤ 60 nm form on the surface of the films. We evaluated the mechanism of formation of complexes by using Fourier-transform infrared spectroscopy and confirmed the findings with density functional theory and molecular dynamics. We found that the particle diameter is inversely proportional to the diffusion coefficient. The results show that the particles are almost uniformly distributed over the surface of the polymer matrix and have a unimodal character. We obtained reproducible results when using a chitosan/collagen mass ratio of 10:2 to dye natural silk. We found that the complexes contribute to increase the intensity and stability of colour relative to soap and friction.

CLASSIFICATION OF CONTEMPORARY HOUSING IN THE HISTORICAL CONTEXT

Preservation of historical buildings while accommodating modern housing is a difficult challenge in urban development. The successful integration of contemporary architectural design within the context of historic districts requires careful consideration of various factors. In this article, we present a comprehensive classification scheme for modern housing in historic buildings based on a careful analysis of practical experience and architectural principles. The classification scheme covers eight key features that serve as the main parameters for evaluating and classifying modern housing in a historical context. These features include project quality classes, floor plan, functionality, volume-spatial structure, construction method, furnishing materials, color scheme and approach to harmonization with the historical context. Classification signs are divided into different categories, sometimes into subcategories and cover the relatively maximum load of world experience in the design of modern housing in a historical context. The project quality classes are divided into mass housing and housing of increased comfort. Flooring is defined by three categories: low-rise, medium-rise and multi-story. Different forms of spatial and volumetric structure, which flow from different sections of the design and structure of quarters in the historical districts of the cities, are defined. Furnishing materials are divided into traditional, modern, and combined options. On the basis of historical architecture, coloristic categories are defined, which either repeat the historical colors of the city, or contrast against their background. Also, residential buildings are defined according to functionality, while multi-functional residential buildings are divided into several categories according to various variants of architectural and planning solutions of complexes. The last feature is the main feature in the case of determining the harmonization of modern housing with the historical context and is divided into 5 categories, starting from pseudo-historical design and ending with the contrasting formation of modern architecture.

Emergence of belief-like representations through reinforcement learning.

To behave adaptively, animals must learn to predict future reward, or value. To do this, animals are thought to learn reward predictions using reinforcement learning. However, in contrast to classical models, animals must learn to estimate value using only incomplete state information. Previous work suggests that animals estimate value in partially observable tasks by first forming "beliefs"-optimal Bayesian estimates of the hidden states in the task. Although this is one way to solve the problem of partial observability, it is not the only way, nor is it the most computationally scalable solution in complex, real-world environments. Here we show that a recurrent neural network (RNN) can learn to estimate value directly from observations, generating reward prediction errors that resemble those observed experimentally, without any explicit objective of estimating beliefs. We integrate statistical, functional, and dynamical systems perspectives on beliefs to show that the RNN's learned representation encodes belief information, but only when the RNN's capacity is sufficiently large. These results illustrate how animals can estimate value in tasks without explicitly estimating beliefs, yielding a representation useful for systems with limited capacity.

Cytogenetic changes in irradiated rats under influence of guaninium-zinc chloride complex

Aim. The main goal of this study was to study the anti-radiation effect of guaninium-zinc chloride complex on cytogenetic changes in irradiated rats. Methods. White rats of the Wistar line with an average weight of 110-125 grams served as the material for the detection of the anti-radiation effect of guaninium-zinc chloride complex. Animals were injected intraperitoneally with solutions of guaninium-zinc chloride complex at a concentration of 40 mg/kg 2 hours before irradiation and were subjected to general uniform gamma irradiation from a 60Co source in the Rukhund-20000 irradiation unit at a dose of 3 and 5 Gy. Results. Cytogenetic analysis of animals showed that with a single injection of guaninium-zinc chloride complex solutions before irradiation, the proportion of chromosomal abnormalities decreased markedly, and reached 2.93 %, and the amount of abnormal spermatozoa markedly decreased. Guaninium-zinc chloride complex softened the damaging effects of ionizing radiation. There was no suppression of cell division. Conclusions. It was found for the first time that, with the introduction of a solution of guaninium-zinc chloride complex in white Wistar rats before irradiation, it reduces the damaging effect of gamma irradiation. The obtained data gives grounds to assume that the guaninium-zinc chloride complex tested by us can be recommended as a promising anti-radiation agent.

The dynamical study of fractional complex coupled maccari system in nonlinear optics via two analytical approaches

In this work, the modified auxiliary equation method (MAEM) and the Riccati–Bernoulli sub-ODE method (RBM) are used to investigate the soliton solutions of the fractional complex coupled maccari system (FCCMS). Nonlinear partial differential equations (NLPDEs) can be transformed into a collection of algebraic equations by utilizing a travelling wave transformation, the MAEM, and the RBM. As a result, solutions to hyperbolic, trigonometric and rational functions with unconstrained parameters are obtained. The travelling wave solutions can also be used to generate the solitary wave solutions when the parameters are given particular values. There are several solutions that are modelled for different parameter combinations. We have developed a number of novel solutions, such as the kink, periodic, M-waved, W-shaped, bright soliton, dark soliton, and singular soliton solution. We simulate our figures in Mathematica and provide many 2D and 3D graphs to show how the beta derivative, M-truncated derivative and conformable derivative impacts the analytical solutions of the FCCMS.The results show how effectively the MAEM and RBM work together to extract solitons for fractional-order nonlinear evolution equations in science, technology, and engineering.

Solid-to-solid polymorphic phase transitions in two isostructural Bi(III) complexes with 1-phenylethyl-N-ethylthiosemicarbazide and halogens

Two isostructural (in room temperature) complexes of Bi(III) with halogens and sulfur ligands have been investigated in terms of the solid-to-solid phase transitions indicated by temperature. Both chloride and bromide (X) complexes of the general formula (µ2-X)-(BiX2L2)2 exhibit some phase transitions between 100 and 333 K, which, apart from the numerous similarities, show significant differences, which have been noted and analyzed in detail in this paper by using different techniques, i.e., powder and single crystal diffraction or DSC. The obtained results have also been collated with those obtained for solid solutions of both complexes.

Создание комфортных условий эксплуатации выставочных комплексов в жарком климате

Purpose: To consider the possibility of using modern innovative coating materials, and in particular ETFE film, in the enclosure structures when designing public buildings in different natural and climatic conditions, with the example of regions with hot climates. Method: Generalization of design principles, including those for hot climates. Analysis of climatic parameters of hot climate regions which have a significant impact on comfortable conditions of people staying in public buildings, characterized by multifunctionality, large spatial dimensions, high occupancy rates, and other factor s. To show the possibility of providing favorable conditions for people staying in such buildings in different ways: through planning and design; improvement of adjacent areas; the location of the building. To carry out the analysis of domestic and foreign experience of application of means of sun protection of buildings. To develop space-planning and structural solutions of the exhibition complex. To evaluate the effectiveness of the proposed solution through a computational study. Results: The results of the research of a range of measures aimed at improving the conditions for comfortable stay of people in the exhibition complexes are presented. The constructive solution of sun protection of the exhibition complex taking into account physical and mechanical properties of the membrane system and climatic conditions of the construction areas has been proposed. Practical significance: The versatility of using dome structures as enclosures is demonstrated. The advantage of using innovative covering materials as an alternative to traditional materials is shown.

Extremal Solutions for Surface Energy Minimization: Bicubically Blended Coons Patches

A Coons patch is characterized by a finite set of boundary curves, which are dependent on the choice of blending functions. For a bicubically blended Coons patch (BBCP), the Hermite cubic polynomials (interpolants) are used as blending functions. A BBCP comprises information about its four corner points, including the curvature represented by eight tangent vectors, as well as the twisting behavior determined by the four twist vectors at these corner points. The interior shape of the BBCP depends not only on the tangent vectors at the corner points but on the twist vectors as well. The alteration in the twist vectors at the corner points can change the interior shape of the BBCP even for the same arrangement of tangent vectors at these corner points. In this study, we aim to determine the optimal twist vectors that would make the surface an extremal of the minimal energy functional. To achieve this, we obtain the constraints on the optimal twist vectors (MPDs) of the BBCP for the specified corner points by computing the extremal of the Dirichlet and quasi-harmonic functionals over the entire surface with respect to the twist vectors. These twist vectors can then be used to construct various quasi-minimal and quasi-harmonic BBCPs by varying corner points and tangent vectors. The optimization techniques involve minimizing a functional subject to certain constraints. The methods used to optimize twist vectors of BBCPs can have potential applications in various fields. They can be applied to fuzzy optimal control problems, allowing us to find the solution of complex and uncertain systems with fuzzy constraints. They provide us an opportunity to incorporate symmetry considerations for the partial differential equations associated with minimal surface equations, an outcome of zero-mean curvature for such surfaces. By exploring and utilizing the underlying symmetries, the optimization strategies can be further enhanced in terms of robustness and adaptability.

High-definition and robust visualization of latent fingerprints utilizing ultrabright aggregation-induced emission of iridium developer

Creation of AIEgens with high brightness is compactly related to acquiring optimum AIE capabilities and still faces challenges. This study proposes an ingenious structurally regulative approach for preparing ultrabright AIEgens, taking iridium complexes as the model. The incremental rotational activity of substituents obtained by fine adjustment of the stereoscopic configuration efficaciously activates the AIE of iridium complexes and synchronously imparts high-brightness luminescence. Subsequently, benefitting from the ultrabright AIE, high-resolution visualization of latent fingerprints (LFPs) is achieved on diverse substrates by transient immersion in a solution of the AIE-active iridium complex (Ir3) for 60 s. The LFPs stained by Ir3 are integral and distinct enough to possess level 1–3 detail features, which allow precisely realizing personal identification. The LFP photograph emerges inconspicuous attenuation of contrast when aged under ambient light for 10 days and then being continuously irradiated with high-power ultraviolet light for 1 h, reflecting extraordinary aging resistance. Notably, the ultrabright AIE of Ir3 with room-temperature phosphorescence feature successfully achieves enhanced visualization of local fingerprint details with ultrahigh contrast. This LFP visualization protocol based on the ultrabright AIEgens is practical and provides a reliable solution for forensic investigations in actual scenarios.

The synthesis of novel water-soluble zinc (II) phthalocyanine based photosensitizers and exploring of photodynamic therapy activities on the PC3 cancer cell line.

In this study, Schiff base substituted phthalocyanine complexes (Zn1c, Zn2c) and their quaternized derivatives (Q-Zn1c, Q-Zn2c) were synthesized for the first time. Their structures have been characterized by FT-IR, 1H-NMR, UV-Vis, mass spectrometry and elemental analysis as well as. The photophysicochemical properties (fluorescence, singlet oxygen and photodegradation quantum yield) of these novel complexes were investigated in dimethylsulfoxide (DMSO) for both non-ionic and quaternized cationic phthalocyanine complexes and in aqueous solution for quaternized cationic phthalocyanine complexes. Water soluble cationic phthalocyanine compounds gave good singlet oxygen quantum yield (0.65 for Q-Zn1c, 0.66 for Q-Zn2c in DMSO; 0.65 for Q-Zn2c in aqueous solution). The binding of Q-Zn1c and Q-Zn2c to BSA/DNA was studied by using UV-Vis and fluorescence spectroscopy and these. Studies indicate that the mechanism of BSA quenching by quaternized zinc(II) phthalocyanines was static quenching. Quaternized zinc(II) phthalocyanines interacted with ct-DNA by intercalation. Quaternized zinc(II) phthalocyanines caused a decrease in cell viability and triggered apoptotic cell death after PDT was applied at a concentration that did not have a toxic effect on their own. Q-Zn1c and Q-Zn2c mediated PDT reduced the activity of SOD, CAT, GSH while increased MDA level in the prostate cancer cells. Furthermore, expression of apoptotic proteins after PDT was examined. The results revealed that the synthesized water soluble quaternized zinc(II) phthalocyanine complexes (Q-Zn1c and Q-Zn2c) are promising potential photosensitizers for PDT.

Electrospray ionization developed by Lidija Gall's group

This historical review is dedicated to Prof. Lidija Gall. She was awarded the Thomson medal (2022) for her contribution to the development of electrospray ionization mass spectrometry in the early 1980s in Leningrad, Soviet Union. We describe the rationale and provide historical references that highlight her way to the discovery of a method of solvated ion extraction at atmospheric pressure (SIEAP), known by the Russian abbreviation ЭРИАД (ERIAD), which is the direct analogue of electrospray ionization developed in the West. Even at the early prototype stage, ERIAD was able to determine the intact masses of a broad scope of polar biomolecules including peptides, small proteins, nucleotides, carbohydrates, and prostanglandins. The ERIAD source was directly coupled to microbore liquid chromatography and was applied to analyze protein digests, to characterize the substrate specificity of proteolytic enzymes, to mapping of mutation sites in physiologically important proteins and also to increase the confidence in protein sequence determinations. In inorganic chemistry, ERIAD was successfully applied to analyze the solutions of rare-earth metals and metal complexes. Altogether, a set of experimental studies and a broad scope of applications contributed to better understanding of the ionization mechanism and the methods needed to acquire and interpret ERIAD spectra. The method was first implemented on a magnetic sector mass spectrometer and then was adopted to a variety of mass analyzers and mobility separators in collaboration with Russian mass spectrometry groups.

Characteristics of O/W emulsion gels stabilized by soy protein-xanthan gum complex for plant-based processed meat products.

The aim of the present study is to characterize the mechanical properties of O/W emulsion gels stabilized through soy protein isolate (SPI)-xanthan gum (XG) complex and to elucidate their practical usefulness in plant-based processed meat products. O/W emulsions prepared by mixing aqueous solutions of SPI-XG complexes, which was formed via electrostatic interactions under acidic conditions (pH 4.0), with plant oil were gelled in the presence of several hydrocolloids. Effects of hydrocolloid composition, oil type and load, and oil droplet size on the mechanical properties of the emulsion gels were investigated by dynamic viscoelasticity measurements, and fluorescence microscopy was performed for observation of the oil droplet dispersion. Results indicated that methylcellulose should be required to provide the gels with heat resistance and that the type of oil used should affect dynamic storage modulus (G') of the gels particularly at lower temperatures. It was also found that increased oil load should decrease the gel's resistance to deformation, making the gel structure brittle, and that oil drop size should affect G' and dynamic loss modulus (G") at lower strains. Food application tests indicated that the emulsion gels used had a great impact on the mechanical properties of plant-based meat patties. These findings would contribute to the utilization of the emulsion gels as a lipid portion in plant-based processed meat products, leading to the progress of industrial practice.

Some new soliton solutions of a semi-discrete fractional complex coupled dispersionless system

In this paper, a semi-discrete fractional derivative complex coupled dispersionless system is proposed. The properties of M-fractional derivative are utilized to convert discrete M-fractional derivative system to a classical discrete differential system. Then the invariant subspace method (ISM) is utilized to find dark, bright, kink and W-shaped soliton solutions for the proposed system.

Synthesis and Characterization of New Azo dye and applications in colorimetric analysis of trace metal ions in Aqueous Medium

The chelation behavior of azo dye HL derived from coupling 4-nitrophenyl diazonium salt with 7-hydroxycoumarin with Cd (II), Hg(II) and Fe (III) metal ions has been studied. Reaction of the azo dye with Cd (II) and Hg(II) ions at different pH gave new two complexes. At pH=8, complex of the formula [Cd(L)2]Cl2 was formed while at pH=4.5, the complex [Cd(L) Cl2]. 2H2O was obtained. Another two new complexes of the formula [Fe(L)2Cl2]Cl.2H2O have been obtained from the reaction of aqueous solution of the azo dye with FeCl3.6H2O. All the above preparations were performed after fixing the optimum pH and molar concentration. Wide range of molar concentrations was investigated and the concentration which obeyed the Lambert-Beer’s Law, was chosen. The effects of time on the stability of these complexes were checked. The stoichiometry of the above prepared complexes was determined using mole ratio and Job methods. A great bathochromic shift was observed in the UV–Vis absorption spectra of (10-6-10-8 mole/lit.) of an aqueous solution of the solid complexes. The vibration spectra of these complexes gave different changes compared to that of the free ligand. The 1H NMR spectra for one of the complexes were also performed.