Spin Crossover and Thermochromism of Iron(II) Coordination Compounds with 1,2,4-Triazoles and Tris(pyrazol-1-yl)methanes


  • Ludmila G. Lavrenova,

    1. Federal State Budget Institution for Science, Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Acad. Lavrentyev Ave. 3, Novosibirsk 630090, Russia
    2. Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia
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  • Olga G. Shakirova

    1. Federal State Budget Institution of Higher Education, “Komsomolsk-on-Amur State Technical University”, Lenin Ave. 27, Komsomolsk-on-Amur 681013, Russia
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  • Dedicated to the memory of Vladimir N. Ikorskii


We review herein the synthesis and investigation of iron(II) coordination compounds with 1,2,4-triazoles or tris(pyrazol-1-yl)methanes as ligands. Both groups of complexes demonstrate thermally induced spin crossover accompanied by thermochromism [pink (magenta) ↔ white color change]. Factors that influence the nature and temperature of the spin crossover are discussed.