I. I. Seifullina

Copper(II) coordination compounds with 2-(7-bromo-2-oxo-5-phenyl-3H-1,4-benzdiazepin-1-yl)acetohydrazide and products of its condensation with pyruvic acid

Some methods for the synthesis of copper(II) complexes with 2-(7-bromo-2-oxo-5-phenyl-3H-1,4-benzodiazepin-1-yl)acetohydrazide (Hydr) ([Cu(Hydr)(H2O)Cl2]) and products of its condensation with pyruvic acid ([Cu(HydrHPv)(H2O)Cl2] and, with alkalization to pH 8, [Cu(HydrPv)2]) were developed, and the complexes themselves were synthesized. The complexes were characterized by electrical conductivity, magnetic susceptibility, and IR and EPR spectroscopy measurements.

Characterization of the coordination compounds of Co(II) and Ni(II) with 2-(7-bromo-2-oxo-5-phenyl-3H-1,4-benzodiazepin-1-yl)acetohydrazide and its condensation product with pyruvic acid

Complexes of Co(II) and Ni(II) with 2-(7-bromo-2-oxo-5-phenyl-3H-1,4-benzodiazepin-1-yl)acetohydrazide and its condensation product with pyruvic acid were synthesized and studied. The complexes were characterized by elemental analysis, thermogravimetry, IR and EXAFS spectroscopy, as well as electrical conductivity and magnetic susceptibility measurements.

Synthesis, structure, and properties of the Cu(II) coordination compounds with the pyruvic acid nicotinoyl and isonicotinoyl hydrazones

New coordination compounds of Cu(II) and hydrazones of nicotinic and isonicotinic acids have been prepared. The complexes isolated have been studied by elemental analysis, thermogravimetric analysis, magnetic susceptibility measurements, IR, diffuse reflectance, and EXAFS spectroscopy. The geometry of the compounds has been determined and the type of the ligands coordination has been revealed. Antibacterial activity of the complexes has been studied.

Synthesis and Characterization of Zn(II) Complexes of 2-(7-Bromo-2-oxo-5-phenyl-2,3-dihydro-1 H -1,4-benzodiazepin-1-yl)acetohydrazide and Its Condensation Products with Pyruvic Acid and Isatin

The systems ZnCl2–2-(7-bromo-2-oxo-5-phenyl-2,3-dihydro-1H-1,4-benzodiazepin-1-yl)acetohydrazide (Hydr)–propan-2-ol, ZnCl2–Hydr–pyruvic acid (HPv), and Zn(CH3COO)2–Hydr–isatin(HIz)–propan-2-ol were studied. Optimal synthesis conditions were determined, and the complexes [Zn(Hydr)2Cl2], [Zn(HydrHPv)2Cl2], and [Zn(HydrIz)2] were isolated. The complexes were characterized by elemental analysis, thermogravimetry, IR spectroscopy, and mass spectrometry. The electrical conductivities of the complexes were measured. The local environment of the central atom in the coordination entity was determined by X-ray absorption spectroscopy.

Self-Assembly in the Systems MX2–Nicotinic Hydrazide–Pyruvic Acid (М = Со, Ni; X = Cl, CH3COO)

In the course of self-assembly in the systems MX2–nicotinic hydrazide (HN)–pyruvic acid, where М = Co, Ni; X = Сl, CH3COO, complexes of composition: [CoCl(HNРv)(H2O)2], [Co(HNРv)2], [Ni(HIРv)2] have been synthesized. Local atomic structure of the coordination centers was established by the method of X-ray absorption spectroscopy. Thermal stability, electric conductivity, and magnetic susceptibility of the complexes have been determined.

Products of complexation in the Cu(CH3CОО)2–2-(7-bromo-2-oxo-5-phenyl-3H-1,4-benzodiazepin-1-yl)acetohydrazide–salicylaldehyde–isopropanol system

Copper(II) complexes isolated from the Cu(CH3COO)2–2-(7-bromo-2-oxo-5-phenyl-3H-1,4-benzodiazepin-1-yl)acetohydrazide (Hydr)–salicylaldehyde (HSal)–isopropanol system [Cu2(HydrSal)2(μ-CH3COO)] (I), [Cu(HydrSal)2] (II) (HydrSal (hydrazone)is the condensation product of hydrazide and salicylaldehide) are synthesized and investigated. The complexes are characterized by elemental analysis, electrical conductivity measurements, and IR spectroscopy. The composition and structure of the Cu2+ coordination core are determined by ESR spectroscopy (I), magnetic susceptibility measurements and extended X-ray absorption fine structure (EXAFS) spectroscopy (II).

Self-assembling in the systems МХ2–2-(7-bromo-2-oxo-5-phenyl-2,3-dihydro-1Н-1,4-benzdiazepin-1-yl)acetohydrazide–salicyl aldehyde (М = Сo, Ni, Zn; X = Cl, CH3COO)

By self-assembling in the systems MX2–2-(7-bromo-2-oxo-5-phenyl-2,3-dehydro-1Н-1,4-benzdiazepin-1-yl)acetohydrazide (Hydr)–salicyl aldehyde (HSal) (М = Co, Ni, Zn; X = Cl, CH3COO) the complexes of composition [Co(HydrSal)2], [Ni(HydrSal)2], [Zn(HydrHSal)Cl2], [Zn(HydrSal)(CH3COO)(H2O)] have been synthesized. The local atomic structure of the coordination unit was determined by the method of X-ray absorption spectroscopy. Thermal stability, electroconductivity, and magnetic susceptibility of the complexes have been studied.

Understanding the structure of salicyl hydrazone metallocomplexes: crystal structure, AIM and Hirshfeld surface analysis of trichloro-(N-salicylidenebenzoylhydrazinato-N,O,O′)-tin(IV)

The results of detailed experimental and theoretical study of chemical intra- and intermolecular bonding of salicyl hydrazone complex with SnCl3 are described. The chemical bonding pattern in the crystal and isolated molecule is described in terms of Bader’s “Atoms in Molecules” (AIM) theory. Analysis of AIM charges has revealed that amount of charge transferred from ligand to SnCl3 moiety is equal to ≈xa00.3xa0e that leads to significant redistribution of bond lengths as compared to other tin(IV) salicyl hydrazonates. Comparison of geometry and characteristics of electron density distribution indicates the weakening of coordination Sn–O and Sn–N bonds in isolated molecule in comparison with crystal up to 10xa0kcal/mol. This effect was explained by the intermolecular H···Cl bonding. According to the Hirshfeld surface analysis, these interactions have the most pronounced contribution to the crystal packing energy. The significance of the present article lies in both the detailed inspection of the crystal packing effect on the coordination bonds of the tin(IV) atom and intermolecular interactions governing the supramolecular self-assembly of hydrogen-bonded chains by means of specific interactions and π···π stacking.

Complexation of SnCl4 with benzaldehyde 2-R-benzoyl-(R-HBb) and 3-R-2-naphthoylhydrazones (R = H, OH): The structure of [SnCl4(2-OH-HBb)] · CH3CN

The reactions of tin tetrachloride with benzaldehyde 2-R-benzoyl and 3-R-2-naphthoylhydra zones (R-HBb and R-HLb, respectively) in acetonitrile and methanol have been studied. For R = H, the reactions lead to isolation of HBb and HLb, and for R = OH, the reactions give the SnCl4(2-OH-HBb)] · CH3CN (I) and [SnCl4(3-OH-HLb)] · 2CH3CN] (II) complexes. Their composition and structure have been determined by conductometry and electronic and IR spectroscopy. In both complexes, the ligands are biden tately coordinated in the ketone form (O(C=O), N(CH=N). Thermolysis of I and II is accompanied by removal of hydrogen chloride and volatile tin-containing species. The molecular and crystal structure of I has been determined by X-ray crystallography. The coordination polyhedron of the tin atom {SnCl4ON} is a distorted octahedron; in the crystal, the complex molecules are linked by an O–H···N(CH3CN) hydrogen bond and form stacks through stacking interactions between the phenyl substituents.

Complexation of SnCl4 with salicylic aldehyde benzoyl hydrazone (H2Bs) and isonicotinoyl hydrazone (H2Is): Molecular and crystal structures of [SnCl3(HBs] and [SnCl3(Is · H] · 2CH3CN

Complexes [SnCl3(HBs)] (I) and [SnCl3(Is2H)] · nSolv (n = 2, Solv = CH3CN (II); n = 0 (III); n = 2, Solv = DMF (IV)) with the molar ratio Sn: ligand = 1: 1 are prepared by reacting SnCl4 with salicylic aldehyde benzoyl or isonicotinoyl hydrazone (H2Bs or H2Is). IR and 1H NMR spectroscopy proves that the ligands in I–IV are coordinated in a tridentate-cyclic mode through the azomethine nitrogen atom and the oxygen atoms of the oxy group (in I–IV) and the carbonyl (I) or oxyazine group (II–IV), so that the ligands in II–IV are in the N(py) protonated form. The thermal decomposition of complexes is found to be accompanied with the elimination of chlorine- and tin-containing species into vapor phase. The molecular and crystal structures of complexes I and II are determined by X-ray crystallography.