Mixed-Ligand Cobalt(II) and Nickel(II) Complexes with N , N ,-Diethylpyridine-3-carboxamide: Synthesis and Crystal Struc
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Mixed-Ligand Cobalt(II) and Nickel(II) Complexes with N,N,-Diethylpyridine-3-carboxamide: Synthesis and Crystal Structure T. G. Cherkasovaa, *, N. V. Pervukhinab, c, N. V. Kuratievab, c, E. V. Cherkasovaa, I. V. Isakovaa, Yu. A. Mizinkinaa, and E. S. Tatarinovaa aGorbachev
Kuzbass State Technical University, Kemerovo, 650000 Russia Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia c Novosibirsk National Research State University, Novosibirsk, 630090 Russia *e-mail: [email protected]
b
Received December 23, 2019; revised March 10, 2020; accepted March 27, 2020
Abstract—The new complexes [M(NKA)2(NCS)2(H2O)2], where M2+ = Co2+ (I), Ni2+ (II); NKA = C10H14N2O (N,N-diethylpyridine-3-carboxamide, nicotinic acid diethylamide, nikethamide), have been synthesized and studied by chemical and X-ray diffraction analyses and IR spectroscopy. The single-crystal X-ray diffraction analysis of these complexes has shown that they crystallize in triclinic system with space group P 1. Despite similar molecular structures of the two complexes, the orientation of molecules in a crystal cell is different in them. The coordination polyhedron of the metal atom is a distorted octahedron built of the O atoms of two coordinated water molecules, the two N atoms of the pyridine rings of two NKA molecules, and the two N atoms of rhodanide groups. The packing of molecules leads to the appearance of additional stacking interactions with the formation of a branched network of hydrogen bonds between coordinated water molecules and NKA carbonyl groups in the structures of these complexes. Keywords: N,O-containing ligands, thiocyanate complexes of metals DOI: 10.1134/S0036023620080021
INTRODUCTION Nicotinic acid derivatives, among which nikethamide (N,N-diethylpyridine-3-carboxamide, nicotinic acid diethylamide) is classified, are used as N,O-containing ligands in the coordination compounds of 3d metals. The published papers are devoted to the synthesis and spectroscopic and structural study of adducts of organic copper(II) complexes with NKA and the investigation of their magnetic characteristics [1–7]. Mononuclear mixed-ligand complexes of cobalt(II) [8–14], nickel (II) [15–19], and zinc [20] and polymeric thiocyanate complexes of iron(II) [21] and cadmium [22] with NKA have been synthesized and characterized by X-ray diffraction. Being ambidentate, the thiocyanate ion enables the formation of compounds with various structures. Thus, the thiocyanate groups in [Fe(NCS)2(NKA)2]n do not participate in the formation of a chain structure built due to NKA molecules, whereas the metal ions in the cadmium complex are linked to each other through bidentately bridging thiocyanate groups. This study continues the studies of the thiocyanate complexes of metals with neutral organic ligands, namely, nicotinic acid and its derivatives.
The objective of this work was to perform the synthesis and IR spectroscopic study of the new complexes [M(NKA)2(NCS)2(H2O)2], where M2+ = C
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