Crystal structures of copper(II) and nickel(II) nitrate and chloride complexes with 4-bromo-2-[(2-hydroxyethylimino)-met
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CTURE OF ORGANIC COMPOUNDS
Crystal Structures of Copper(II) and Nickel(II) Nitrate and Chloride Complexes with 4-Bromo-2-[(2-Hydroxyethylimino)-Methyl]phenol Yu. M. Chumakova, V. I. Tsapkovb, I. G. Filippovaa, G. Bocellic, and A. P. Guleab a
Institute of Applied Physics, Academy of Sciences of Moldova, Academiei 5, Chisinau, 2028 Moldova e-mail: [email protected] b State University of Moldova, ul. Matteevicha 60, Chisinau, 2009 Moldova c Institute of Materials for Electronics and Magnetism, National Research Council (IMEM–CNR), Parma, Italy Received August 2, 2007
Abstract—The crystal structures of {4-bromo-2-[(2-hydroxyethylimino)-methyl]phenolo}aquacopper(II) nitrate hemihydrate (I), chloro-{4-bromo-2-[(2-hydroxyethylimino)-methyl]phenolo}copper hemihydrate (II), and chloro-{4-bromo-2-[(2-hydroxyethylimino)-methyl]phenolo}aquanickel (III) are determined using X-ray diffraction. Crystals of compound I are formed by cationic complexes, nitrate ions, and solvate water molecules. In the cation, the copper atom coordinates the singly deprotonated molecule of tridentate azomethine and the water molecule. The copper complexes are joined into centrosymmetric dimers by the Ow–H···O hydrogen bonds. The crystal structure of compound II is composed of binuclear copper complexes and solvate water molecules. The copper atom coordinates the O,N,O ligand molecule and the chlorine ion, which fulfills a bridging function. The coordination polyhedron of the metal atom is a distorted tetragonal bipyramid in which the vertex is occupied by the chlorine atom of the neighboring complex in the dimer. Compound III is a centrosymmetric dimer complex. The coordination polyhedra of two nickel atoms related via the inversion center are distorted octahedra shared by the edge. PACS numbers: 61.66.Dk, 87.14.-g DOI: 10.1134/S1063774508040111
INTRODUCTION
OH
In previous studies [1, 2], it has been shown that copper(II) salts and 2-[2-(hydroxyethylimino)methyl]phenol form coordination compounds of various compositions that exhibit antimicrobial properties. The structural, physicochemical, and biological properties of these compounds are determined by the nature of the central atom and its inner-sphere environment. However, since the above complexes have been synthesized predominantly with the use of salicylaldehyde as the initial reactant, it is of interest to elucidate how the introduction of a substituent, such as bromine, into the benzene ring of the salicylidene fragment affects the composition, structure, and properties of these compounds. In this respect, we synthesized {4-bromo-2[(2-hydroxyethylimino)-methyl]phenolo}aquacopper(II) nitrate hemihydrate [Cu(H2O)L]NO3 · 0.5H2O (I), chloro-{4-bromo-2-[(2-hydroxyethylimino)-methyl] phenolo}copper hemihydrate [CuLCl] · 0.5H2O (II), and chloro-{4-bromo-2-[(2-hydroxyethylimino)methyl]phenolo}aquanickel [Ni(H2O)LCl] (III), where
HO
,
HL = N Br
and determined the crystal and molecular structures of these compounds by X-ray diffraction analysis. SAMPLE PREPARATION AND EXPERIMENTAL TEC
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