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 \(P\bar {1}.\) 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.

中文翻译：

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N，N，-二乙基吡啶-3-甲酰胺的混合配体钴（II）和镍（II）配合物：合成和晶体结构

摘要

新的配合物[M（NKA）₂（NCS）₂（H ₂ O）₂ ]，其中M ²⁺ = Co ²⁺（I），Ni ²⁺（II）；NKA ＝ C ₁₀ H ₁₄ N ₂ O（N，N，N-二乙基吡啶-3-甲酰胺，烟酸二乙酰胺，尼克乙酰胺），已经通过化学和X射线衍射分析和IR光谱法进行了研究。这些配合物的单晶X射线衍射分析表明，它们在空间群为\（P \ bar {1}。\）的三斜晶系中结晶。尽管两种复合物的分子结构相似，但晶体细胞中分子的取向不同。金属原子的配位多面体是由两个配位的水分子的O原子，两个NKA分子的吡啶环的两个N原子，以及Rhodanide基团的两个N原子组成的扭曲的八面体。分子的堆积导致出现额外的堆积相互作用，并且在这些配合物的结构中，配位水分子与NKA羰基之间形成了氢键分支网络。