We review here new advances in the synthesis and investigation of iron(II) coordination compounds with tris(pyrazol-1-yl)methane and its derivatives as ligands. The complexes demonstrate thermally induced spin crossover accompanied by thermochromism. Factors that influence the nature and temperature of the spin crossover are discussed.

中文翻译：

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三（吡唑-1-基）甲烷在新的铁（II）配位化合物中的自旋交叉

我们在这里综述三（吡唑-1-基）甲烷及其衍生物作为配体的铁（II）配位化合物的合成和研究的新进展。该配合物显示伴随热致变色的热诱导自旋交叉。讨论了影响自旋交越点的性质和温度的因素。