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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Synthesis, Crystal Structures, and Spectroscopic and Thermal Properties of New Cobalt Thiocyanato Coordination Compounds Based on 3-Methylpyridine as a Neutral Coligand
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Synthesis, Crystal Structures, and Spectroscopic and Thermal Properties of New Cobalt Thiocyanato Coordination Compounds Based on 3-Methylpyridine as a Neutral Coligand

机译：以3-甲基吡啶为中性配体的新型钴硫氰酸根配位化合物的合成，晶体结构，光谱和热性质

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摘要

Reaction of cobalt(II) thiocyanate with 3-methylpyridine in water leads to the formation of the new ligand-rich cobalt(II) thiocyanato coordination compounds [bis(thiocyanato-N)-tetrakis(3-methylpyridine- N)cobalt(II)] (1) and [bis(thiocyanato-N)-bis(3-methylpyridine-N)-diaqua-cobalt(II)] (2). The crystal structures of 1 and 2 consist of discrete complexes in which the cobalt(II) cations are coordinated by two terminally N-bonded thiocyanato anions and four or two terminally bonded coligands, respectively, in a slightly distorted octahedral geometry. Investigations on the thermal degradation behavior of 1 and 2 using simultaneous differential thermoanalysis and thermogravimetry as well as X-ray powder diffraction and IR spectroscopy have proven that on heating a stepwise decomposition takes place, which leads to the formation of the new phase-pure ligand-deficient intermediate [bis(thiocyanato-N)-bis(3-methylpyridine-N)cobalt(II)] (3). The crystal structure of 3 also consists of discrete complexes, but the cobalt(II) cations are only tetrahedrally coordinated by two terminally N-bonded thiocyanato anions and two terminally bonded coligands. The structures and the thermal properties are discussed and compared with that of related transition metal thiocyanato coordination compounds.
机译：硫氰酸钴（II）与3-甲基吡啶在水中的反应导致形成新的富含配体的硫氰酸钴（II）硫氰酸根配位化合物[双（硫氰酸根-N）-四（3-甲基吡啶-N）钴（II） ]（1）和[双（硫氰酸根合-N）-双（3-甲基吡啶-N）-二氢-钴（II）]（2）。 1和2的晶体结构由离散的络合物组成，其中钴（II）阳离子分别由两个末端N键合的硫氰酸根阴离子和四个或两个末端键合大分子配体配成略微扭曲的八面体几何形状。使用同时的差示热分析和热重分析以及X射线粉末衍射和IR光谱研究1和2的热降解行为已证明，在加热时会发生逐步分解，从而导致形成新的纯相配体-缺乏的中间体[双（硫氰酸根合-N）-双（3-甲基吡啶-N）钴（II）]（3）。 3的晶体结构也由离散的络合物组成，但钴（II）阳离子仅通过两个末端N键合的硫氰酸根阴离子和两个末端键合大分子配体四面体配位。对结构和热性能进行了讨论，并与相关的过渡金属硫氰酸根配位化合物进行了比较。

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