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Iron(II) closo-borate complexes with 1,2,4-triazole derivatives: Spin crossover in the iron(II) closo-borate complexes with tris(pyrazol-1-yl)methane |
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| Authors: | O G Shakirova V A Daletskii L G Lavrenova S V Trubina S B Erenburg K Yu Zhizhin N T Kuzhetsov |
| Institution: | 1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russia 2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia 3. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia |
| Abstract: | Methods of synthesis of iron(II) complexes containing cluster closo-borate anions—Fe(Htrz)3]B10Cl10 (I) (HTrz is 1,2,4-triazole), Fe(NH2Trz)3]B10Cl10 · 2H2O (II) (NH2Trz is 4-amino-1,2,4-triazole), Fe{HC(pz)3}2]B10Cl10 (III), Fe{HC(pz)3}2]B10H10 (IV), and Fe{HC(pz)3}2]B12H12 · 2H2O (V) (HC(pz)3 is tris(pyrazol-1-yl)methane)—have been developed. The compounds have been studied by the static magnetic susceptibility method (78–500 K) and electronic, IR, and EXAFS spectroscopy. Complexes I and II in the temperature range under consideration remain in the high-spin state. Low-spin complex III shows incomplete spin crossover and decomposes on heating above 440 K. Complexes IV and V are characterized by reversible spin crossover 1 A 1 ? 5 T 2 accompanied by thermochromism (the pink ? white color change). The crossover temperature (T c) for IV and V is 375 and 405 K, respectively. |
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