Thiourea Complexes Research Articles

Mixed ligand complexes of Pt(II) Tertiary phosphines and 1-(benzo[d]thiazol-2-yl)-3-phenylthiourea; Crystal structure and DFT of [Pt(C14H9N3S2)(dppe)].CH2Cl2

This paper describes a series of Pt(II) thiourea complexes (1–4). The complexes were synthesized by a reaction between [PtCl2(diphos)] and the ligand 1-(benzo[d]thiazol-2-yl)-3-phenylthioure in the presence of triethylamine, with all reactants present in equimolar amounts. The produced complexes exhibited square planar geometry, which was validated by FT-IR and 1HNMR . Single crystal XRD study revealed that the coordination geometry was distorted square planar in [Pt(Btzt)(dpppe)]. Hirshfeld surface analysis was used to delve deeper into the intermolecular interactions which showed that the combined contribution of H⋯H and H⋯C contacts in the stabilization of the supramolecular assembly was 81.3%. A void analysis was carried out which showed that there was no large cavity in the supramolecular assembly. Theoretical studies were also conducted on [Pt(Btzt)(dpppe)]. The DFT analysis was carried out using the B3LYP Hybrid method in combination with Def2-SVP. The theoretical findings indicated just 3% differences between the theoretical and experimental Figures. Furthermore, the computed HOMO-LUMO gap was 3.4 eV, which was close to the anatase photocatalyst's band gap. DFT predicted that all complexes are non-magnetic with μB=0. There are high electron donation and back-donation between heteroatoms and transition metals in the complexes.

Platinum(II) phosphoryl-substituted thiourea complexes with bis-phosphine ligands and some triphenylarsine and triphenylstibine analogues

Reactions between the phosphorylthiourea ligands (EtO)2PONHC(S)NHPh (L1), (EtO)2PONHC(S)NHCH(CH3)3) (L2) and (EtO)2PONHC(S)NHCH2CH3 (L3) and cis-[PtCl2(PPh3)2] gave complexes in which the ligands bind to the platinum(II) centre as dianionic ligands. For ligands L1 and L3, the ligand binds through the thiourea sulfur and the N-alkyl nitrogen atoms, giving the distal isomer. In contrast, the ligand L2, on account of the bulky t-butyl substituent on the ligand, coordinates via the sulfur and N-phosphoryl nitrogen atoms, giving the proximal isomer. The identities of the isomers were confirmed by single crystal X-ray analysis and 31P{1H} NMR spectroscopy. The latter showing that the appearance or absence of 3J(PP) couplings between the ligand and ancillary ligands provides indicative isomeric information. Further reactions between the ligand L1 and a series of bis-phosphine, triphenylarsine and triphenylstibine platinum(II) starting complexes gave the corresponding products also as the distal linkage isomer. Computational analysis reveals a possible chalcogen bond non-covalent interaction that may be responsible for the preference for the distal isomer.

Characterization, Comparative Assessment and Antibacterial Potential of Copper(II) Soya Complexes against Staphylococcus Aureus

Copper(II) soap complexes have been proven their activity against bacteria very effectively. Herein, the influence of biophysical and biomechanical parameters on the activity of Copper(II) soya thiourea complex was evaluated. To this aim, liquid as well as solid growth media were developed by Kirby-Bauer disc diffusion method. The antibacterial activity of Copper(II) soya thiourea complex against the Gram-positive bacterium Staphylococcus aureus was assessed in various concentration of Copper(II) Soya complexes. Copper (II) Soya complexes also resist bacterial growth at higher concentration. This review provides a board overview of Staphylococcus aureus with an emphasis on the Copper(II) soya thiourea complex

Study of Structural Elucidation, Degradation Kinetics and Antimicrobial Analysis of Copper (II) Sesame-Soap Complexes with Urea and Thiourea Ligand in Non-aqueous Solvents

Abstract: Surfactants have great importance in biological and drug industries and the complexes of metallic soaps with various ligands are used in approximately every region of national economy. Therefore, our keen interest to study of degradation kinetics and biological importance of Cu (II) surfactants in non-aqueous and non-polar solvent benzene. Present research work has been initiated with synthesis, systematic study of structural elucidation, thermal degradation, kinetics and biocidal activities of copper (II) sesame-soap complexes with macrocyclic nitrogen and sulphur containing donar ligands like urea and thiourea. The thermal degradation of copper (II) sesame-soap complexes were carried out for analysis of degradation kinetics and estimation of kinetic and thermodynamic parameters using different methods at heating rate 10oC min-1. Copper (II) sesame-soap complexes of such ligands have also been analysed against Staphylococus aureus. This research work consolidates the synthesis of copper (II) sesame soap-urea and thiourea complexes by conventional methods and the structure of these complexes were assigned according to elemental analysis and molecular weight determinations. IR, NMR and ESR spectral studies have also been done to understand structural aspects. The anti-microbial activities of copper (II) sesame-soap urea and thiourea complexes have been evaluated by testing against Staphylococus aureus. The present research work includes information of thermal analysis using TGA technique to find out their kinetic and thermodynamic parameters by using diverse equations such as Coats-Redfern equation, Horowitz-Metzger equation, Broido equation, Piloyan–Novikova equation. Moreover, the results obtained from anti-microbial screening have been used to analyze the anti-microbial activities of copper (II) sesame-soap urea and thiourea complexes against gram-positive bacteria Staphylococus aureus. These results show that complexes of copper ion co-ordinated with different nitrogen, oxygen and sulphur containing ligands, are very important in the field of pharmaceutical chemistry due to its significant role in the inhibition activity. The study of these complexes concludes that the synthesized complexes were found to possess appreciable bactericidal properties at different concentrations because chelation increases the anti-microbial potency.

Bis(diphenyl)phosphinomethane Platinum(II) complex of 1-(benzo[d]thiazol-2-yl)-3-phenylthiourea: Crystal structure and DFT study

This study extensively describes synthesizing and characterizing a novel Pt(II) thiourea complex and its mixed ligand bisdiphenylphosphinomethane complex. The first complex [Pt(BtztH)2] is obtained by reacting K2PtCl4 and 1-(benzo[d]thiazol-2-yl)-3-phenylthiourea in 1:2 molar ratio. The second complex [Pt(Btzt)(dppm)] was synthesized by reacting dichlorobis(diphenyl)phosphinomethane platinum(II) complex with 1-(benzo[d]thiazol-2-yl)-3-phenylthioure in equimolar ratio with the presence of Et3N. Both complexes adopt square planar geometry, which were determined by FT-IR, 1H-nmr and X-ray crystallography. In comparison with the first complex, the second complex has doubly deprotonated, resulting in a dianion Pt(II) complex, which was determined by X-ray single crystal measurement. The asymmetric unit contained two unique molecules with distorted square planar geometry. A couple of non-covalent or intermolecular interactions stabilized the solid-state supramolecular assembly. Hirshfeld surface analysis was conducted in order to have a deeper understanding of the supramolecular assembly. Enrichment ratio calculations determined the pair of chemical species with the highest propensity for making interatomic contact. The [Pt(Btzt)(dppm)] compound was also investigated theoretically. The DFT study was performed by using B3LYP/Def2-TZVP method. Theoretical findings indicate that the HOMO-LUMO gaps range from 2.2 to 3.22 eV, indicating that the compounds possess favorable semiconductor properties. Within these complexes, the coordinated atoms exhibit strong electron donations to the Pt cation, while the Pt cation demonstrates significant back-donation to the ligand.

Update on thiopyran-fused heterocycle synthesis (2013-2024).

Thiopyrans and their fused derivatives have significant synthetic relevance owing to their biological importance and occurrence in natural products. The current article provides an overview of synthetic strategies employed for the construction of thiopyran-fused heterocycles. In particular, this article discusses synthetic methods for the fusion of thiopyran with heterocycles such as indole, quinoline, pyrimidine, pyridine, thiophene, chromene, oxazole, pyrazole, pyran and furan and covers the literature from 2013 to 2024. The most common precursors for thiopyrano[2,3-b]indoles, thiopyranoquinolines and thiopyranothiazoles are indoline-2-thione, 2-mercaptoquinoline-3-carbaldehyde and thiazolidinone, respectively, and various reactions involving these are described in detail here. Asymmetric syntheses of thiopyranoindoles achieved using chiral catalysts based on thiourea, proline and metal complexes are also included. The biological activity associated with some compounds is also discussed.

Corrosion inhibitory studies of an eco-friendly thiourea derivative of amino acid on aluminium using 0.1M HCl solution

The inhibition efficiency and corrosion rate of aluminium were investigated at varying temperatures and immersion time using thiourea complex with an organic ligand at concentrations of 0.20, 0.40, 0.60, 0.80 and 1.00 M. The results showed that an increase in the concentration of the complex thiourea led to an increase in the inhibition efficiency, which was attributed to the availability of the proton moiety of the thiourea lost as electron in acidic media. The inhibition efficiency decreased as the immersion time increased with temperature and the largest decrease observed at 333 K due to the distortion of molecular structure of the complex thiourea at high temperatures. The corrosion rate decreased with an increase in immersion time but increased with temperature, possibly due to inhibitor molecular rearrangement. The activation energy of the suppression process of high-concentration thiourea was found to be higher than that of low-concentration, indicating that the adsorption process was triggered by physical adsorption. The formation of a thin film on the metal surface was due to the presence of complex thiourea acted as a barrier to both energy and mass transport, leading to an increase in the activation energy. The adsorption of the thiourea derivatives complex on aluminum was primarily physisorption. The Langmuir, Flory-Huggins, Tempkin, and Dubinin-Radushkevich adsorption isotherm models were investigated with Langmuir found to be the most fitted model based on high R2 values of the model.

Ruthenium(III) acyl thiourea complex: A catalyst for transfer hydrogenation of nitroarenes

The complex of ruthenium (III) ([RuCl2(PPh3)2BTU], 1) was prepared by reacting the acylthiourea ligand with a ruthenium salt ([RuCl2(PPh3)3]), and has been thoroughly characterised using various analytical techniques such as elemental analysis, magnetic susceptibility, UV–Vis, 1H NMR and single-crystal X-ray diffraction. The crystal packing of 1 has been found to be stabilised by intramolecular and intermolecular hydrogen bonding interactions, as well as CH⋅⋅⋅π contacts, namely C9-H9A⋅⋅⋅Cg(5), C12-H12A⋅⋅⋅Cg(4) and C45-H45⋅⋅⋅Cg(3), which play a crucial role in determining the overall supramolecular crystal structure of the compound. Hirshfeld surface analysis and 2D fingerprint analysis of 1 revealed that the compound was stabilised by various intermolecular interactions, including CH⋯C and CH⋯Cl interactions, with intermolecular H⋅⋅⋅H (54.9 %), C⋅⋅⋅H/H⋅⋅⋅C (23.6 %) and Cl⋅⋅⋅H/H⋅⋅⋅Cl (19.0 %) interactions being more prominent than other types of interactions. Furthermore, the conversion of nitroarenes to their corresponding aniline compounds was studied at different time intervals in ethanol at 50 °C in the presence of NaBH4. Examination of different nitro substrates revealed that 1 was a remarkable catalyst for the catalytic reduction of nitroarenes (0.01 mol of catalyst, >99 yield).

Gold recovery from synthetic mine tailings leachate using chelating ion exchange resins with thiosulfate-thiourea lixiviant

Recovery of gold from mining tailings is important economically and environmentally in the mining industry. With a limited amount of mineable gold remaining, the process of recovering gold from mine tailings needs development. This paper will specifically investigate the recovery of gold using ion-exchange resins in a thiosulfate-thiourea lixiviant solution. A range of resins of different functionalities: Purolite® A200 (Type II quaternary ammonium), Lewatit® MonoPlus TP 214 and Puromet® MTS9140 (thiourea), Dowex™ M-4195 (bis-picolylamine) and Lewatit® VPOC 1026 (di(2-ethylhexyl)phosphate- D2EHPA) were assessed for their gold uptake capabilities via dynamic column experiments. A mixed-metal solution was used to accurately simulate the spent lixiviant from thiosulfate/thiourea leaching of mine tailings. All resins showed selectivity towards gold over the numerous other metals in solution, which was believed to be due to the stability of aqueous gold thiourea complexes. Puromet® MTS9140 had the highest gold capacity, with a calculated uptake capacity of 41.6 mg/L. Modified-Dose Response (MDR), Bohart-Adams and Yoon-Nelson models were used to describe the data; the MDR model being the most successful.

Synergistical thiourea and thiosulfate leaching gold from a gold concentrate calcine with copper-ammonia catalysis

Thiosulfate leaching is a non-toxic and eco-friendly alternative method to cyanidation. However, thiosulfate leaching was used to leach gold from the gold concentrate calcine, and gold extraction effect was poor. To achieve effective leaching of gold, thiourea was added to facilitate gold extraction. This research not only investigated the leaching conditions and leaching kinetics but also discussed the potential reason and reaction mechanism of thiourea improving gold extraction. Gold extraction efficiency within 2 h was close to that of cyanidation (24 h) under the conditions: 0.2 mol/L thiosulfate, 0.12 mol/L thiourea, 5 mmol/L copper ion, 0.6 mol/L ammonia, 3 of liquid to solid ratio, and 308 K of leaching temperature. The gold in the leached solution was effectively recovered by the resin. According to the mechanism analysis, the gold in the leached solution existed in the form of gold(I) thiourea complex and gold(I) thiosulfate complex. The reason responsible for improving gold extraction efficiency lied in that inhibited the form of passivation layer and synergistically leached gold, and rapid leaching speed may be due to synergistical leaching. Thiourea is added in the thiosulfate leaching process, and offers a feasible, efficient, and fast leaching method for green development of the hydrometallurgy industry.

Thermal Analysis and Biocidal Studies of Copper (II) Soapgroundnut Complex Containing Urea and Thiourea as a Ligand

Background: Studies on the thermal decomposition of synthesized complexes have great importance for calculating the thermal stability and characterization of copper (II) soap complexes, and represent new investigations on the solution of environmental problems. Aim: The present research work aims to report new findings in the field of thermogravimetric analysis and biocidal studies for copper (II) groundnut complexes with urea and thiourea ligands. Objective: The objective of this study was to conduct the kinetic analysis of copper (II) soap complexes of nitrogen and sulphur-containing ligands with the help of a thermogravimetric analyser (TGA), as this technique is commonly applied for thermal analysis. Methods: In relevance of aforesaid applications, the present work deals with determining the different thermal degradation steps of newly synthesized copper (II) groundnut urea complex (CGU) and copper (II) groundnut thiourea complex (CGT) by using Coats- Redfern, Horowitz-Metzger, Broido, and Piloyan-Novikova equations for determining kinetic parameters, i.e., the energy of activation (E), rate constant, order of decomposition reaction, and pre-exponential factor (Z). Results: The results obtained from kinetic parameters were used to evaluate the thermodynamic parameters, i.e., entropy of activation (ΔS), enthalpy of activation (ΔH), and Gibbs free energy of activation (ΔG), corresponding to the activation by using previously mentioned equations. Kinetics of degradation for the synthesized complexes in solid state were studied using thermogravimetric analysis technique (TGA) in nitrogen atmosphere. Conclusion: The present study has discussed the biocidal activities of these complexes against Staphylococcus aureus and an explicit correlation between structure and biological activity has also been provided.

Antimicrobial Studies of Copper (II) Sesame Urea and Thiourea Complex Against Staphylococus Aureus

In the present work a systemat¬ic study give an overview of new findings in the field of biocidal activities for copper (II) sesame soap complex with urea ligand. The aim of this research work is to present fundamental chemical properties and new investigations of coordination compounds of some transition metal ions with an overview of medicinal applications. Transition metals appear in almost every facet of our day-to-day life, from industrial uses such as the manufacture of construction and building materials, tools, vehicles, up to cosmetics, paints and fertilizers. Their reactions are in general important in many technical processes such as catalysis, material synthesis, photochemistry, as well as, in biology and medicine. The present work deals with the study of synthesis and characterization of biological properties of novel copper (II) soap urea complex.

An investigation and Environmental Aspects of Copper(II) Surfactant with Photocatalytic Degradation

Surfactants have wide use all over the world in various field of the national economy, will continue to expand its scope of application and the consumption is also increasing. Photodegradation is a branch of science, which attracted the attention of science community all over the world due to selection of light as energy source to degrade large molecules to smaller size molecules which does not degrade easily. Copper(II) Soya Thiourea complex has been synthesised and photocatalytic degradation of this complex carried by using ZnO as semiconductor catalyst in non aqueous solvent benzene. Concentration effect on Copper (II) Soya Thiourea complex with reference of optical density, photodegradation and percent degradation has been studied here. Using light as an energy source to drive a reaction results in chemistry is much more ‘green’, helping to eliminate the requirement for harsh reactants which are often toxic and unrecoverable. Photocatalysis also has applications in wide area of renewable energy. Analysis of biological activities of Copper soap complex is also done with Staphylococcus aureus to anticipate that it will generate new hopes in the field of biological applications.

Protection of wood against bio-attack and research of new effective and environmental friendly fungicides

Abstract This research investigated the design, chemical modification, characterization and biocidal evaluation of waxes. Tallow (animal fat), bee-wax (insect) and shea butter (plant fat) were first converted to carboxylates by metathesis and later transformed into urea and thiourea complexes. The transformation was monitored using UV–visible, FT-IR and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy. They were also screened for biocidal activities using two white rots (Pleurotus sajor-cajor and Pleurotus oestratus), two brown rots (Sclerotium rolfsii and Rhizotonia solanii) and a soft rot (Cheatomium globosum). The UV–visible absorption peaks shifted to a longer wavelength for the complexes in relation to the carboxylates signifying lower energy and higher activities. Carboxylates showed very sharp peaks around 1700 cm−1 attributable to the carbonyl functional group (C=O) (Scheme 1), the carbonyl (C=O) peaks in the carboxylates were replaced by the appearance of another peaks in the urea and thiourea complexes at around 1600 cm−1 attributable to azomethine (C=N) (Scheme 2 and 3). None of the surface morphologies of the samples (crystalline) is identical. This result further confirmed the formation of the products. The result of fungi assay showed that tallow based carboxylate, urea and thiourea complexes greatly inhibited the growth of all the fungi species used. However, bees wax based carboxylate and its complexes as well as plant-fat based carboxylate and its complexes could not inhibit the growth of Sclerotium rolfsii. For insect and plant-based urea complexes, there were tiny growths (pin head) seen on the plates inoculated with P. sajor-cajor and P. oestratus, respectively. The findings of this work showed that urea and thiourea complexes performed better than carboxylates in fungi inhibition. Tallow-based products (carboxylates, urea and thiourea) showed the greatest anti-fungi properties.

Computational Study of Bis-(1-(Benzoyl)-3-Methyl Thiourea) Platinum (II) Complex Derivatives as Anticancer Candidates.

The increasing incidence of cancer every year has resulted in cancer becoming one of the most common causes of death in the world. The most common types of cancer are breast cancer, lung cancer and prostate cancer. Thiourea is one of the compounds that have anticancer effects, and its activity can be increased by structural modifications, one of which involves making a Bis-(1-(benzoyl)-3-methyl thiourea) platinum (II) metal complex. This study aims to obtain platinum (II)-thiourea complex compounds that have a more stable interaction as an anticancer agent compared to cisplatin. The methods used are computational studies with molecular docking, simulation of molecular dynamics, and prediction of pharmacokinetics and toxicity. Based on the molecular docking of the platinum (II)-thiourea complex which has the most stable interaction with lower binding energy than the native ligand and the cisplatin, namely Bis-(3-methyl-1-(naphthalene-2-carbonyl)thiourea)) Platinum (II) against breast cancer receptors (3ERT) and lung cancer (2ITO) and compounds Bis-(1-(3-chlorobenzoyl)-3-methylthiourea) Platinum (II) against prostate cancer receptors (1Z95). The evaluation results of the stability of the interaction using a 50 ns molecular dynamic simulation showed that the Bis-(1-benzoyl-3-methylthiourea) Platinum (II) which binds to the prostate cancer receptor (1Z95) has the most stable interaction. Pharmacokinetic prediction results show that the platinum (II)-thiourea complex has a good pharmacokinetic profile, but there are several compounds that are mutagenic and hepatotoxic. The Bis-(1-(3,4-dichlorobenzoyl)-3-methyl thiourea) platinum (II) compounds could be a suitable anticancer agent for the lungs.

Synthesis and characterization of new thiourea complexes

تم تحضير أربعة مجمعات من مشتق ثيوريا (4-ميثوكسي- N- (فينيل كارباموثيويل) بنزاميد) عن طريق تفاعل 4-ميثوكسي بنزويل أيزوثيوسيانات مع الأنيلين ، ثم تفاعل اللجين الذي تم الحصول عليه مع (MnII ، CoII ، CuII ، NiII) كانت المجمعات الناتجة تتميز بالتحليل العنصري ، أطياف FTIR ، UV-Vis ونقطة الانصهار. الصيغة العامة التي تم الحصول عليها هي [L2MCl2] لجميع المجمعات ذات الهندسة الاوكتاهدرا ، حيث (L) = (4-methoxy-N (phenylcarbamothioyl) benza-mide) و M = (MnII، CoII، CuII، NiII).

Synthesis of complex compounds of the monoammonium salt of glycyrrhizic acid and thiourea

With poor (low) solubility in the aquatic environment, highly toxic drugs (aspirin, doxorubicin, daunorubicin, sulfonamides and others), a low level of glycyrrhizic acid (HA) leads to a decrease in the toxicity of drugs and increases their biological activity due to poor solubility in water. The stability constants (stability) and the value of the Gibbs energy of the synthesized supramolecular complex have been calculated, theoretical and experimental research methods were used to determine the conditions for obtaining supramolecular complexes of glycyrrhizic acid and thiourea. These researches were carried out as part of joint work to study the effect of the toxicity of medicines on a living organism, under an interuniversity program between Andijan State University and the Tashkent Pharmaceutical Institute of the Republic of Uzbekistan. The aim of the research is to determine the stability constant (stability) of the synthesized supramolecular complex of the monoammonium salt of glycyrrhizic acid (MASHA) with thiourea and the value of the Gibbs energy. To determine the structure and composition of the resulting supramolecular complex of MASHA with thiourea, UV and IR spectroscopy and the isomolar series method were used.

Synthesis, structural analysis, DFT study, antioxidant activity of metal complexes of N-substituted thiourea

In this work, N-substituted thiourea and its metal complexes were synthesized and characterized by Nuclear magnetic resonance (NMR), Infrared (IR) spectroscopy and X-ray phase analysis. DFT/B3LYP level of theory with 6–31++G(d,p) basis set have been used to determine the geometry, energy and electronic parameters, characterized the stable structures of these compounds. Frontier molecular orbitals energies, energy gap, chemical reactivity descriptors, atomic charges, dipole moment and polarizability have been calculated, the sites of electrophilic and nucleophilic regions where the molecular interactions likely to happen are identified for reagent and complex. The electron density transfer and hyper conjugative interactions are elucidated. The data obtained allowed us to predict the reactivity CuCl2 substituent. It was revealed that the nature of the mentioned substituent favors the formation of a stable five-membered ring via coordinate bonding N6-Cu25 and N17-Cu25. In addition, the thiocarbonyl and methyl groups form a pseudo six-membered ring via the C10H13…S5 hydrogen bond in this complex. It was found that the experimentally and theoretically obtained parameters of the proposed models of thiourea and its complex with CuCl2 have match well. The antioxidant properties of the synthesized compounds were studied in model reactions. Since the study of the mechanism of the antioxidant action of oxidation inhibitors under real conditions of oxidation of lubricating oils is very difficult, the antioxidant effect of the compounds synthesized by us was studied in the oxidation reaction of a model hydrocarbon-cumene, the oxidation mechanism of which was studied in detail. The study of cumene autoxidation in the presence of these compounds showed that they effectively inhibit the autoxidation process.

Synthesis and characterization of new Co(II), Rh(III), and Pt(II) guanidine and thiourea complexes

Guanidine- and thiourea-based complexes have been the subject of extensive study due to their wide range of potential applications, including but not limited to anti-cancer drugs, ion transporters, and sensors. Building upon previous work done in this group, we aimed to demonstrate a new series of organometallic complexes based on functionally diverse guanidine and thiourea ligands. Herein, the synthesis and characterization of new platinum, rhodium, and cobalt complexes is presented. While most of these complexes conformed to properties and behaviours in line with previous work, one complex based on a Pt(II) and guanidine derivative exhibited unusual supramolecular properties, demonstrating a larger self-assembled dimer consisting of six Pt(II) cations.

Physico-chemical Characterization of Some Metal Complexes Formed by Substituted Thiourea

In view of unique physico-chemical observations affecting the geometry and various properties of the substituted thiourea complexes in literature along with several biological activities, N-(hydroxy)-N,N-diphenyl thiourea was taken up for study. Complexes with geometries of high spin octahedral for iron(II), cobalt(II); tetrahedral & square planar for nickel(II); and dimeric square planar for copper chloride, copper perchlorate, copper acetate and distorted octahedral for copper nitrate were synthesized and characterized based on magnetic moments, visible spectra, diffuse reflectance spectra, electron spin resonance, infrared spectral studies, and thermal analysis.
 Interestingly, the nature of anion influenced the geometry, the complex from copper nitrate salt resulted in a distorted octahedral structure and complexes formed from copper chloride, copper perchlorate, copper acetate exhibited sub-normal magnetic moments, highly insoluble in the most common organic solvents and water. Based on these and spectral data, polymeric or square-planar dimeric geometry with sulfur bridging between copper atoms is proposed. It was confirmed by the application of Bleaney-Bower’s equation for magnetic susceptibility, applicable to dimeric copper complexes.
 The overall thermal behavior of the ligand and complexes were observed and the detailed calculations interestingly lead to confirmation of the above proposed geometrical structures.