Spin crossover in the coordination compounds of iron(II) with tris(3,5-dimethylpyrazol-1-yl)methane

Autor:	L. G. Lavrenova, Liliya A. Sheludyakova, Alexander V. Virovets, T. F. Mikhailovskaya, V. A. Daletskii, Dmitriy A. Piryazev, A. D. Strekalova, S. F. Vasilevskii
Rok vydání:	2012
Předmět:	Tris chemistry.chemical_classification Thermochromism General Chemical Engineering General Chemistry Crystal structure Magnetic susceptibility Coordination complex chemistry.chemical_compound Crystallography Nuclear magnetic resonance chemistry Spin crossover Phase (matter) Crystallite
Zdroj:	Russian Journal of Coordination Chemistry. 38:507-514
ISSN:	1608-3318 1070-3284
Popis:	Iron(II) complexes with tris(3,5-dimethylpyrazol-1-yl)methane {HC(3,5-Me2Pz)3} of the composition [Fe{HC(3,5-Me2Pz)3}2]Am · nH2O (A = Cl− (I), ClO 4 − (II), SO 4 2− (III), CF3SO 3 − (IV), m = 1, 2, n = 0.1) are synthesized. The compounds are studied by static magnetic susceptibility, IR and diffuse reflectance spectroscopy, and X-ray structure analysis. The crystal structures of two polymorphous modifications of the [Fe{HC(3,5-Me2Pz)3}2](ClO4)2 (IIa and IIb) and [Fe{HC(3,5-Me2Pz)3}2](CF3SO3)2 (IV) complexes are determined. The temperature dependence μeff(T) shows that the spin crossover 1 A 1 ai 5 T 2 is observed in the polycrystalline phase of complex I and in one of the single-crystal phases of complex II (IIa) and is accompanied by thermochromism (the change of the dark pink color ai to white).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b0d30ad9efd2644f9e63a5b2c2c76d5c https://doi.org/10.1134/s1070328412070081 Zobrazit plný text záznamu Full text from SpringerLink