CDCl3 Research Articles

Crystal structure and Hirshfeld surface analysis of {2-[bis(pyridin-2-ylmethyl)amino]ethane-1-thiolato}chloridocadmium(II)

The title compound, [Cd(C14H16N3S)Cl] or [CdLCl] (1), where LH = 2-[bis(pyridin-2-ylmethyl)amino]ethane-1-thiol, was prepared and structurally characterized. The Cd2+ complex crystallizes in P21/c with a distorted trigonal–bipyramidal metal coordination geometry. Supramolecular interactions in 1 include parallel offset face-to-face interactions between inversion-related pyridyl rings and potential hydrogen bonds with chlorine or sulfur as the acceptor. Additional cooperative pyridyl–pyridyl interactions with roughly 45° tilt angles and centroid–centroid distances of less than 5.5 Å likely also contribute to the overall solid-state stability. Hirshfeld surface analysis indicates that H...H (51.2%), Cl...H/H...Cl (13.9%), C...H/H...C (12.3%) and S...H/H...S (11.8%) interactions are dominant in the solid state.

Anion-pairing effect in Cd(II) coordination with a tetrabenzotetraza-crown macrocyclic ligand

Three new complexes of a tetrabenzotetraza-crown ether macrocyclic ligand (L) with Cd(II) chloride (1), iodide (2), and acetate (3) salts were synthesized and characterized by FT-IR, 1H NMR spectroscopy, elemental microanalysis, and single crystal X-ray diffraction. Complex 1 has the formula [Cd(L)Cl]2 [CdCl4] with two square pyramidal [Cd(L)Cl]+ subunits interconnected through the CdCl42− counter anion. Meanwhile, the reaction with CdI2 produces the discrete complex [Cd(L)I]I (2) with an octahedral geometry about the Cd(II) center. A distorted six-coordinated asymmetric unit was observed for [Cd(L)OAc]2(OAc·H2O)2 (3), wherein two [Cd(L)OAc]+ subunits are held together by a flat (OAc·H2O)2 acetate-water cluster. Hirshfeld Surface calculations were applied to confirm the dominant interactions in 1–3, namely π–π, and X⋯H/H⋯X (X-H, C, O, and halogen) interactions as the main factors for their structural differences. At the same time, the structure of [Cd(L)L′]+ (L′ = Cl, I, and OAc) core remained almost unchanged. The Cd(II) coordination with L in the presence of different Cd(II) salts was followed by 1H NMR spectroscopy. All three Cd(II) salt displays 1:1 stoichiometry, with binding constants in the order CdCl2 < CdI2 < Cd(OAc)2.

Numerical simulations on cables attached with different shapes of lights and its mitigations by using perforated shrouds

To reduce the cable vibration caused by rectangular lights, the light shape is modified to be ellipsoidal and circular sections, together with the use of a perforated shroud. Numerical simulations on six types of cable-light models were conducted using computational fluid dynamics. The mean drag coefficient CD, mean and mean lift coefficient CL, mean of the ellipsoidal lights, circle lights, and perforated shroud cable are reduced compared to the rectangular light. CD, mean can be reduced by a maximum of 50%; CL, mean can be reduced by a maximum of 43%. The maximum fluctuating drag and lift coefficient are also significantly reduced. This indicates that the perforated shrouds might be useful to mitigate the vortex-induced vibration. The ellipsoidal and circular lights are significantly better than rectangular lights in terms of galloping critical wind speed. Furthermore, the perforated shroud is very beneficial for suppressing galloping vibration. The variation of Strouhal number St with the wind attack angle for the shroud rectangular light cable model is relatively smooth, all around 0.1. The wake vortices of rectangular light, ellipsoidal light, and circular light are shed alternately in a typical 2S pattern. However, the alternately shedding vortex of the shroud cable was interrupted by the flow of air through the holes. When the wind attack angle exceeds the most dangerous wind attack angle, the incoming stream cannot be reattached after separation, and the force on the cable is greatly reduced, resulting in a sudden drop in the average lift coefficient. Wind pressure in the gap between the shroud and the cable is negative. The fluctuating wind pressure coefficients on the shrouded cables are significantly lower than those of rectangular lights because of the interference effect of the outer perforated shrouds. In total, the perforated shroud is the best to reduce the galloping caused by the rectangular light.

Deuterated chloroform replaces ultra-dry chloroform to achieve high-efficient organic solar cells

Chloroform is a common and excellent solvent for preparing high-efficient organic solar cells (OSCs), however, it is toxic and poisonable chemical. In comparisons, deuterated chloroform (DC) is less toxic and costly, and particularly, it is non-poisonable chemical. In this paper, we use DC to replace ultra-dry chloroform (UC) as the processing solvent for preparation of active layers of organic solar cells. First, we selected PM6:BTP-eC9 as the basic binary and counted 100 solar cells’ data, from which comparable device performance were obtained with use of DC and UC. Interestingly, DC showed better reproducibility, superior storage under a nitrogen atmosphere and a little better performance than UC. Both DC and UC gave rise of comparable hole and electron mobilities and similar charge recombination losses. Second, we based PM6:Y6 and D18-Cl:Y6 as the binaries and similar effects were obtained from both UC and DC when counting 30 devices for each binary. Third, the universality of the use of DC for preparing high-efficient OSCs were again checked with several binary and ternary systems. In all, this study demonstrate that DC can replace UC for use in the field of OSCs.

Cadmium Hydroxyl Chloride with Balanced Band Gap and Second-Harmonic-Generation Response.

Ultraviolet (UV) nonlinear-optical (NLO) materials are crucial in laser technology due to their ability to modulate light frequency. In this work, when d10 cations, hydroxyl groups, and Cl atoms were combined, a cadmium double salt, Cd(OH)Cl, was synthesized by a simple hydrothermal method. It has a large phase-matched second-harmonic-generation (SHG) response at 1064 nm (2.5 × KDP) with a short UV-cutoff edge (260 nm), which can be applied in a solar-blind UV band. Theoretical calculations suggest that [Cd(OH)3Cl3] groups lead to a large SHG response. Our work may shed light on the exploration of new NLO materials in metal hydroxyl chlorides.

Insight of Cadmium Solidification by Mineral‐Based Soil Conditioner

AbstractIn response to the environmental concerns posed by cadmium (Cd) contamination, the application of nano‐submicron mineral‐based soil conditioner (MSC) as a potential soil amendment has garnered interest due to its promising Cd mitigation properties. In this study, we aimed to investigate the solidification capacity and mechanism of Cd in MSC and examine the phase and morphology changes following solidification. Systematic experiments were conducted to assess the solidification capacity of MSC for Cd, revealing an impressive efficiency of nearly 100 % even at Cd concentrations of approximately 800 mg/L. The solidification efficiency was found to be positively correlated with the pH value, significantly declining as the environment shifted from pH&gt;7 to pH&lt;7. Notably, under alkaline conditions (pH&gt;7), Cd solidification in MSC was primarily attributed to the Cd‐OH complex formed on the surface of MSC and aided by cation‐exchange reaction. In contrast, under acidic conditions (pH&lt;7) and exposure to extreme Cd concentrations, Cd(OH)Cl precipitation became the dominant mechanism for solidification. Interestingly, the presence of KCdCl3, a water‐soluble phase, did not significantly contribute to the overall solidification efficiency. These findings provide valuable insights into the solidification mechanism of Cd in MSC and offer potential implications for soil remediation efforts targeting Cd contamination.

C(NH2)3Cd(C2O4)Cl(H2O)·H2O and BaCd(C2O4)1.5Cl(H2O)2: Two Oxalate Chlorides Obtained by Chemical Scissors Strategy Exhibiting Low-Dimensional Structural Networks and Balanced Overall Optical Properties.

Low-dimensional crystalline materials have attracted much attention due to their special physical and chemical properties. Herein, two new oxalate chlorides, C(NH2)3Cd(C2O4)Cl(H2O)·H2O and BaCd(C2O4)1.5Cl(H2O)2, were synthesized. C(NH2)3Cd(C2O4)Cl(H2O)·H2O presents the unique {[Cd(C2O4)Cl(H2O)]-}∞ zigzag chain, while BaCd(C2O4)1.5Cl(H2O)2 shows a novel {[Cd(C2O4)1.5Cl]2-}∞ layer. They showed large measured band gaps, which were 3.76 and 4.53 eV, respectively, and the latter was the largest band gap in the A-M-C2O4-X (A = Monovalent cationic or alkaline earth metals, X = F, Cl, Br, I) family. They exhibit a large calculated birefringence of 0.075 and 0.096 at 1064 nm, respectively. This study promotes the exploration of synthesizing low-dimensional crystalline materials with balanced overall optical performances by a chemical scissors strategy.

Synthesis, Biological Activity, and the Effect of Ionization Radiation on the Spectral, XRD, and TGA Analysis of Cu(I), Cu(II), Zn(II), and Cd(II) Complexes

New complexes of molecular formulae of [Cu(H2L1)I] (B1), [Cu(H2L)2(ClO4)2](B2), [Zn (H2L)2(H2O)]SO4(B3) and [Cd(H2L)Cl]Cl(B4) of ligand N-phenyl-2-(p-tolylglycyl)hydrazine -1-carbothioamide (B) have been prepared and characterized by 1H-NMR, Mass spectra, FT-IR, elemental analyses, molar conductance, UV–visible spectra, magnetic susceptibility measurements, thermogravimetric analysis (TGA/DTG) and X-ray powder diffraction before and after irradiation. Elemental analyses indicate that the metal complexes have 1:1 (metal/ ligand) (B1 and B4) or 1:2 stoichiometry for complexes (B2 and B3). The results confirmed that gamma ray enhanced the stability of irradiated compounds as compared to non-irradiated compounds. XRD patterns proved that increasing the crystallinity of the samples and the particles is in nanosize range before and after gamma irradiation. These studies revealed that Cu(II) and Zn(II) complexes adopted octahedral geometry, and Cu(I) and Cd(II) complexes were found to be tetrahedral. The theoretical conformational structure analyses were performed using density functional theory for ligand and complexes at B3LYP functional with 6–31G basis set for ligand and LANL2DZ basis set for complexes. The ligand (B, A) and complexes (B1–B4) and (A1–A4) before and after irradiated have been tested for their inhibitory effect on the growth of bacteria against gram-positive (Streptococcus pyogenes) and gram-negative (Escherichia coli). Molecular docking investigation proved that the Zn(II) complex had interesting interactions with active site amino acids of topoisomerase II DNA gyrase enzymes (code: 2XCT).

Negative Thermal Expansion in the Noncarboxylate Based Metal–Organic Framework Cd(trz)Cl

Negative thermal expansion (NTE), as a counterintuitive phenomenon, has attracted considerable interest owing to its great scientific and technical value. Owing to the inherent structural flexibility, metal–organic frameworks (MOFs) have recently been recognized as an ideal platform for the study of NTE. However, the reported NTE MOFs are mainly restrained in the carboxylate based ones. Herein, we found that the noncarboxylate MOF Cd(trz)Cl (trz = 1,2,4-trizaole) can also exhibit intrinsic volumetric NTE, and a transition from NTE to PTE at high temperatures can be observed. The combined in situ synchrotron powder X-ray diffraction, Raman spectra measurements, and DFT calculations shed light on the fact that the NTE mainly originates from the synergistic effect of geometric flexibility and the enhanced out-of-plane rotation behavior of the trz ligand. This study not only demonstrates a new NTE material but also can help to extend the scope of NTE to the more diverse noncarboxylate based MOFs.

Synthesis and Characterization of Zinc(II), Cadmium(II), and Palladium(II) Complexes with the Thiophene-Derived Schiff Base Ligand.

Zn(II), Pd(II), and Cd(II) complexes, [L TH MCl 2 ] (M = Zn, Pd; X = Br, Cl) and [L TH Cd(μ-X)X] n (X = Cl, Br; n = n, 2), supported by the (E)-N 1,N 1-dimethyl-N 2-(thiophen-2-ylmethylene)ethane-1,2-diamine (L TH ) ligand are synthesized and structurally characterized. Density functional theory (DFT) electronic structure calculations and variable-temperature NMR support the presence of two conformers and a dynamic interconversion process of the minor conformer to the major one in solution. It is found that the existence of two relevant complex conformers and their respective ratios in solution depend on the central metal ions and counter ions, either Cl- or Br-. Among the two relevant conformers, a single conformer is crystallized and X-ray diffraction analysis revealed a distorted tetrahedral geometry for Zn(II) complexes, and a distorted square planar and square pyramidal geometry for Pd(II) and Cd(II) complexes, respectively. It is shown that [L TH MCl 2 ]/LiO i Pr (M = Zn, Pd) and [L TH Cd(μ-Cl)Cl] n /LiO i Pr can effectively catalyze the ring-opening polymerization (ROP) reaction of rac-lactide (rac-LA) with 94% conversion within 30 s with [L TH ZnCl 2 ]/LiO i Pr at 0 °C. Overall, hetero-enriched poly(lactic acid)s (PLAs) were provided by these catalytic systems with [L TH ZnCl 2 ]/LiO i Pr producing PLA with higher heterotactic bias (P r up to 0.74 at 0 °C).

Phonon assisted charge transfer in complexes of Zn(II) and Cd(II) with 2-acetylpyridine-aminoguanidine

Metal complexes with some Schiff bases, as one of the most widely used groups of ligands, have a wide field of application. In order to find a material with the required optical properties, it is very important to examine the material characteristics as a function of the type of chelating ligand, metal, and the ions present as coligands. In this paper, the synthesis of two new complexes of 2-acetylpyridine-aminoguanidine (L) with zinc(II) and cadmium(II), viz. [Zn(L)(NCO)2] and [{Cd(L)Cl(μ-NCO)}2] is described. Their structural characterization was provided by using SC-XRD. Spectroscopic characterization of these two new complexes and two previously synthesized complexes - [Zn(L)(NSC)2] and [Cd(L)Cl2] are performed. Their phonon structure was determined based on the IR transmission and Raman spectra. The range of Raman modes with significantly increased intensities was registered (1000-1700 cm−1), the same range for all four samples. Also, the registered photoluminescence and energy transfers were analyzed and three photoluminescence peaks (E1, E2, E3) were determined. It was concluded that phonons with significantly increased intensities participate in transitions from the E1 state to the energy levels in the range from E2 to E3. The strength of the peaks was significantly affected by replacing one [Cl]- with the [NCO]- ligand. The addition of the second [NCO]- ligand increases the photoluminescence over the entire measured range. The analysis performed helps to understand the issues related to the electron-phonon interaction. Also, the perspectives for the application of metal complexes with various ligands are expanding.

Investigation of Cd(II) sorption by mackinawite (FeS) under anoxic conditions

Mackinawite (FeS) was investigated for cadmium ion (Cd(II)) sorption under anoxic conditions. At the surface loading of Cd(II) (i.e., [Cd(II)]0/[FeS]0) ≤ 5 mmol/g, FeS quantitatively immobilized Cd(II). Adsorption and CdS precipitation were responsible for Cd(II) uptake, with their relative importance depending on [Cd(II)]0/[FeS]0. At pH 5.5–6.0, adsorption was more important when [Cd(II)]0/[FeS]0 ≤ 0.05 mmol/g. According to energy dispersive X-ray spectroscopy, Cd(II) exhibited strong spatial correlations with S and Cl. While Cd-S correlations corresponded to CdS precipitation and/or the surface complexation of Cd(II) with sulfhydryl functional sites, Cd–Cl correlations indicated the presence of chloride-complexed Cd(II). Given the strong correlations of both pairs, the adsorbed Cd(II) was likely present in chlorosulfide forms (e.g., ≡FeS–Cd(II)–Cl). When [Cd(II)]0/[FeS]0 exceeded 0.05 mmol/g, CdS precipitation became more important. X-ray diffraction, transmission electron microscopy, and selected area electron diffraction revealed the formation of hawleyite (cubic CdS) at higher surface loadings. The Fe(II) species liberated during CdS precipitation were resorbed through adsorption at acidic pH and the formation of Fe (oxyhydr)oxides at neutral to basic pH. Given the greater stability of CdS than adsorbed Cd(II), the prevalence of the former suggests that FeS can serve as an effective reagent to remedy Cd(II) contamination under anoxic conditions. Due to its ubiquitous presence, FeS may also control the environmental fate and mobility of Cd(II) in sulfidic sediments.

Synthesis and structural characterization of new group 12 metal ions coordination polymers built on sulfur‐based ligand and probing their high iodine adsorption efficiency in micro and bulk forms

In this work, we have prepared two new sulfur CPs with group 12 transition metals, namely,[Zn (NCS)Cl(μ2‐L)]n(1)and[Hg (SCN)2(μ2‐L)]n(3).[Cd (NCS)Cl(μ2‐L)]n(2), which is isostructural with1, was synthesized for a comparison from our published work. These compounds have been characterized by FT‐IR, UV–Vis, powder X‐ray diffraction (PXRD), elemental analysis (CHNS), scanning electron microscopy (Fe‐SEM), TGA, BET, and single‐crystal X‐ray analysis for1and3. In the structure of all polymers, the bbit ligand [L = bbit = 1,1‐bis(3‐methyl‐4‐imidazoline‐2‐thion)butane] is bridged between metal centers by the anti‐anti‐anti conformation to form an infinite 1D zigzag chain. The considered polymers were used for the removal of a substantial amount of I2from cyclohexane solution. Despite the nonporous and low dimensional frameworks of title polymers, their maximum iodine adsorption capacities were notable and in order of 817.68, 906.48, and 911.08 mg/g for polymers1–3, respectively, with an extraordinary stability toward iodine. The capacity of micro‐sized structures was almost double as compared with their bulk ones.

Anion-directed structural diversification in four new Cd(II) compounds of a flexible polyether-based dicarboxylic acid

• With a less explored linker 3,6,9-trioxaundecanedioic acid (H 2 toua) a series of complexes with Cd(II) salts containing different counter anions (Cl - , ClO 4 - , OAc - , and NO 3 - ) were synthesized. • A discrete neutral compound [Cd(H 2 toua)Cl 2 ] . H 2 O ( 1 ) is obtained with Cl - whereas a 1D polymeric chain {[Cd(Htoua)(H 2 O)](ClO 4 )} n ( 2 ) is obtained with ClO 4 - counter anion. • Different morphologies are observed with different counter anion analyzed by SEM technique. • Their thermal behavior, Hirshfeld Surface analysis and luminescent properties were also investigated. In this work, we report the chemistry of an unexplored flexible polyether based dicarboxylic acid (3,6,9-trioxaundecanedioic acid, H 2 toua) with four different cadmium salts. With CdCl 2 . H 2 O or Cd(ClO 4 ) 2 . H 2 O in a 1:1 ratio, it remarkably forms a discrete compound [Cd(H 2 toua)Cl 2 ] . H 2 O ( 1 ) and a polymeric ionic compound, {[Cd(Htoua)(H 2 O)](ClO 4 )} n ( 2 ), respectively, as determined by the single crystal X-ray diffraction. In both cases, for the heptacoordinated Cd(II) all basal donor atoms are from the ligand (three ether oxygen and two oxygen atoms from the fully intact or mono-deprotonated carboxylic acid groups, respectively) but with a major difference in axial (trans to each other) coordinated atom types - two chlorines in 1 while one water molecule and a bridging carboxylate oxygen in 2 . Unlike 1 , the carboxylate group of Htoua bridges between the Cd(II) centers for the formation of a 1D polymeric chain in 2 . Furthermore, Hirshfeld surface analysis of the various intermolecular interactions enables quantifiable contributions to crystal packing, revealing the key differences in the interactions encountered by 1 and 2 . Using Cd(OAc) 2 . 6H 2 O as the metal salt, it is possible to make [Cd(toua)] . H 2 O ( 3 ), due to the formation of easily removable volatile acetic acid by-product. On the other hand, a nitrate analogue of 2 , i.e., {[Cd(Htoua)(H 2 O)](NO 3 )} n ( 4 ) is isolated if Cd(NO 3 ) 2 . 4H 2 O is used. All these compounds were characterized by a number of spectroscopic and microscopic methods. Their thermal behaviour and luminescence properties were also determined.

Synthesis, structure and anticancer activities of Cd(II), Cu(II) and Pd(II) complexes with 5,7‐dichloro‐8‐hydroxylquinoline‐2‐carboxaldehyde‐4‐chloro‐2‐aminothiophenol

AbstractThree new complexes of Cd(II), Cu(II) and Pd(II) with 5,7‐dichloro‐8‐hydroxyquinoline‐2‐carboxaldehyde‐4‐chloro‐2‐aminothiophenol (QNS), that are [Cd(QNS‐1H)Cl] (1), [Cu(QNS‐1H)2] (2) and [Pd(QNS‐1H)Cl] (3), were synthesized. Their structures were determined by ESI‐MS, EDX, IR and 1H NMR spectroscopies. The results showed that in (1) and (3) complexes the ratio of M(II):QNS ligand is 1:1, M(II) is bound to QNS through O, Nquinoline and Nbenzothiazole atoms. In complex (2), Cu(II) is bound to the QNS ligand in the 1:2 ratio through Oquinoline and Nquinoline atoms. The complexes were tested for cell in vitro cytotoxicity on human cancer cells. Complex (1) gives better antitumor activity than the remaining complexes on four cancer lines including KB, Hep‐G2, A549 and MCF‐7. The effect of complex (1) on KB and MCF‐7 is higher than cisplatin, a cancer treatment drug, with IC50 values of 15.01 and 17.94 μM, respectively.

Application of Synchrotron Radiation-Based Micro-Analysis on Cadmium Yellows in Pablo Picasso's Femme.

The cultural heritage community is increasingly exploring synchrotron radiation (SR) based techniques for the study of art and archaeological objects. When considering heterogeneous and complex micro-samples, such as those from paintings, the combination of different SR X-ray techniques is often exploited to overcome the intrinsic limitations and sensitivity of the single technique. Less frequently, SR X-ray analyses are combined with SR micro-photoluminescence or micro-Fourier Transform Infrared spectroscopy, which provide complementary information on the molecular composition, offering a unique integrated analysis approach. Although the spatial correlation between the maps obtained with different techniques is not straightforward due to the different volumes probed by each method, the combination of the information provides a greater understanding and insight into the paint chemistry. In this work, we discuss the advantages and disadvantages of the combination of X-ray techniques and SR-based photoluminescence through the study of two paint micro-samples taken from Pablo Picasso's Femme (1907). The painting contains two cadmium yellow paints (based on CdS): one relatively intact and one visibly degraded. SR micro-analyses demonstrated that the two Cd-yellow paints differ in terms of structure, chemical composition, and photoluminescence properties. In particular, on the basis of the combination of different SR measurements, we hypothesize that the degraded yellow is based on nanocrystalline CdS with high presence of Cd(OH)Cl. These two characteristics have enhanced the reactivity of the paint and strongly influenced its stability.

Structure of a subnanometer-sized semiconductor Cd14Se13 cluster

Structure of a subnanometer-sized semiconductor Cd14Se13 cluster

2+3] Amide Cages by Oxidation of [2+3] Imine Cages - Revisiting Molecular Hosts for Highly Efficient Nitrate Binding.

The pollution of groundwater with nitrate is a serious issue because nitrate can cause several diseases such as methemoglobinemia or cancer. Therefore, selective removal of nitrate by efficient binding to supramolecular hosts is highly desired. Here we describe how to make [2+3] amide cages in very high to quantitative yields by applying an optimized Pinnick oxidation protocol for the conversion of corresponding imine cages. By NMR titration experiments of the eight different [2+3] amide cages with nitrate, chloride and hydrogen sulfate we identified one cage with an unprecedented high selectivity towards nitrate binding vs. chloride (S=705) or hydrogensulfate (S>13500) in CD2Cl2/CD3CN (1 : 3). NMR experiments as well as single‐crystal structure comparison of host‐guest complexes give insight into structure‐property‐relationships.

Cadmium(II) compounds of the bis-cyanoethyl derivative (LCX) of Me8[14]aneC (LC): characterization and antibacterial studies

The isomeric ligand LC, a saturated analogue of 2,9-C-meso-Me8[14]diene, on reflux with excess acrylonitrile afforded 1,8-N-pendant cyanoethyl derivative LCX. Interaction of LCX with cadmium(II) perchlorate, nitrate, acetate, and chloride salts produced six coordinated octahedral compounds, [Cd(LCX) (ClO4)2]∙2H2O, [Cd(LCX) (NO3)2], [Cd(LCX) (CH3COO)2], and [Cd(LCX)Cl2], respectively. Further, axial substitution reactions between [Cd(LCX) (ClO4)2]∙2H2O and KI, KBr, KCl, KSCN, and NaNO2 in a 1:2 ratio yielded six coordinated octahedral compounds, [Cd(LCX)I2]∙H2O, [Cd(LCX)Br2]∙2H2O, [Cd(LCX)Cl(ClO4)]∙2H2O, [Cd(LCX) (NCS)2]∙H2O, and [Cd(LCX) (NO2) (ClO4)]∙2H2O, respectively. All of the newly prepared compounds have been characterized by analytical, spectroscopic, molar conductivity, and magnetochemical data. The crystal structure of the ligand LCX was determined by x-ray crystallography which showed the 14-membered ring to adopt an extended chair conformation. Antibacterial activities of the newly formed cadmium(II) complexes against selected bacteria showed these to exhibit moderate and selective activity with 1-4 and 8 exhibiting greatest potency against the gram negative bacterium Salmonella typhi, and 5, 6, and 7 against the gram positive bacterium Bacillus wiedmannii.

ИССЛЕДОВАНИЕ МОСТОВОГО ПЕРЕХОДА ВЫСОКОСКОРОСТНОЙ ЖЕЛЕЗНОДОРОЖНОЙ МАГИСТРАЛИ ПРИ АЭРОДИНАМИЧЕСКИХ ВОЗДЕЙСТВИЯХ

High-speed traffic affects nearby infrastructure. The paper considers influence of wind load on a railway bridge that is a part of a high-speed railway. The paper presents a description of physical modeling of wind influence on the reduced bridge model with a train in a wind tunnel. The authors show gained data of dimensionless coefficients of lifting force CD and front resistance CL. As a result, the authors have made a conclusion on the change of aerodynamic resistance coefficients according to location of a high-speed train on the bridge.