G. G. Sadikov

Synthesis and Crystal Structure of Divaleratobis(nicotinamide)copper(II)

A copper(II) valerate complex with nicotinamide (L) [CuL2(C4H9COO)2] (I) has been synthesized and studied by IR spectroscopy and thermogravimetry. The crystal structure has been determined. The crystals of 1 are monoclinic, a = 11.297(1) Å, b = 6.666(1) Å, c = 16.873(2) Å, b = 108.50(1)°, V = 1204.9(3) Å3, Z = 2, space group P21/c. The structural units of the crystal of I are centrosymmetric tetragonal bipyramidal (4+2) complex molecules. The equatorial positions of the bipyramid are occupied by trans-arranged pairs of O (Cu-O, 1.973 Å) and N (Cu-N, 2.006 Å) atoms, and the axial positions are occupied by the second O atoms of the valerate anions located at longer distances (Cu-O, 2.506 Å). The supramolecular associates formed in the crystal are layers of hydrogen-bonded complexes. The disordered hydrocarbon “tails” of the valerate groups point toward the interlayer space.

Synthesis and structure of two crystalline modifications of Bis(1,10-Phenanthroline)trinitratoeuropium(III) Eu(NO3)3(Phen)2

Two crystalline modifications (I and II) of the phenanthroline complex of europium nitrate with the same chemical composition, Eu(NO3)3(Phen)2, are synthesized under different conditions by varying the solvents, temperatures, and crystallization rates. The crystal structures of these modifications are determined using X-ray diffraction. Crystalline modifications I and II differ in the unit cell parameters and the positions of the complexes in the unit cell. The geometric characteristics of the complexes in the structures of compounds I and II differ insignificantly. Crystals of compound I belong to the isostructural family Ln(NO3)3(Phen)2 (Ln = La-Lu). Crystals of compound II (new phase) are studied for the first time. Crystals of I and II are monoclinic, space group C2/c, and Z = 4. The unit cell parameters are as follows: a = 11.1555(10) Å, b = 17.9698(10) Å, c = 13.0569(10) Å, β = 100.507(10)°, and V = 2572.1(3) Å3 for modification I and a = 9.5153(10) Å, b = 15.4546(10) Å, c = 17.1763(10) Å, β = 93.451(10)°, and V = 2521.3(3) Å3 for modification II. The difference between the molecular complexes in the structures of compounds I and II is revealed by the superposition method. Complexes II are arranged along the C2 axis and are statistically disordered with respect to this axis.

Electrochemical and chemical synthesis and structure of adducts (CH3OH and H2O) of metal chelates of N,N,O tridentate pyrazole-containing Schiff base

Chemical and electrochemical synthesis of a series of cobalt(II), nickel(II), copper(II), and zinc(II) complexes of tridentate Schiff base (H2L), a product of condensation of N-(2-aminophenyl)-4-methylbenzenesulfonamide (2-tosylaminoaniline) with 1-phenyl-3-methyl-4-formylpyrazol-5-ol was accomplished. The structure and composition of metal-chelates were established by the C, H, N elemental analysis, IR, 1H NMR, EXAFS spectroscopy and magnetochemical data. The structures of all complexes were confirmed by of X-ray crystallography.

Synthesis and crystal structure of the copper(II) valerate complex with nicotinamide

AbstractA coordination compound of copper(II) valerate with nicotinamide, [CuL(C4H9COO)2]2 (I), has been synthesized, and its crystal structure has been determined by X-ray crystallography. The crystals of I are triclinic: a = 9.1245(9) Å, b = 9.8572(6) Å, c = 11.0944(9) Å, α = 73.51(1)°, β = 79.917(6)°, γ = 72.161(7)°, Z = 2, space group

Metal chelates with salicylidene-3-carboethoxy-4,5-dimethylthiophene derivatives as azomethine ligands of a new type

P\bar 1

Electrochemical synthesis, structure, and photoluminescent properties of copper, zinc, and cadmium mixed-ligand complexes

. In the centrosymmetric binuclear molecule of I, the copper atoms (Cu...Cu′, 2.621 Å) are linked through four bidentate chelating valerate ligands (av., Cu-O 1.969 Å). The coordination polyhedron of the Cu atom is a tetragonal pyramid with the nitrogen atom of the pyridine ring in the apical position at a longer distance (Cu-N, 2.190 Å).

Synthesis, crystal and molecular structure of [Co(L)3](OH)Cl · H3Ssal) · H2O, where L is benzhydrazide and H3Ssal is 5-sulfosalycilic acid

A coordination compound of nickel(II) benzoate with nicotinamide [Ni(C6H5COO)2(L)2(H2O)2] (I) (L is nicotinic acid amide) is synthesized and studied by IR spectroscopy. Its crystal structure is solved by X-ray crystallography. The crystals of compound I are monoclinic: a = 7.152 Å, b = 18.266 Å, c = 10.341 Å, β = 109.24°, V = 1275.4 Å3, Z = 2, space group P21/c. Structural units of a crystal of I are centrosymmetric octahedral complex molecules. The coordination environment of the Ni atom contains two O atoms (Ni-O(1) 2.066(2) Å) and two N atoms (Ni-N(1) 2.091(2) Å) of the monodentate-coordinated benzoate anions and nicotinamide molecules, respectively, as well as two O atoms of the H2O molecules (Ni-O(1w) 2.110(2) Å).

Direct Electrochemical and Chemical Syntheses, Structures, and Properties of Metal Complexes of Azo Compounds with an Additional Azo Group in the Amine Fragment

New azomethine derivatives of salicylidene-3-carboethoxy-4,5-dimethylthiophene and their metal chelates are synthesized. The enolimine tautomeric form of the azomethine system of the ligand is determined from the data of 1H NMR and IR spectroscopy. According to the IR spectral data, the structures of the Co, Ni, Cu, and Zn complexes are octahedral (the structure of the nickel complex is proved by X-ray diffraction analysis), whereas the palladium chelate has a square structure.