Complexes Fe(HTrz)3B10H10 · H2O and Fe(NH2Trz)3B10H10 · H2O (HTrz = 1,2,4-triazole and NH2Trz = 4-amino-1,2,4-triazole). The spin transition 1 A 1 ⇆ 5 T 2 in Fe(HTrz)3B10H10 · H2O

Autor: M. Bushuev, L. Lavrenova, Yu. Shvedenkov, V. Varnek, L. Sheludyakova, V. Volkov, S. Larionov
Předmět:
Zdroj: Russian Journal of Coordination Chemistry; Mar2008, Vol. 34 Issue 3, p190-194, 5p
Abstrakt: Abstract  Methods for the synthesis of iron(II) complexes with 1,2,4-triazole (HTrz) and 4-amino-1,2,4-triazole (NH2Trz) containing the decahydro-closo-decaborate ion [B10H10]2-were developed. The empirical formulas of the complexes were Fe(HTrz)3B10H10 · H2O (I) and Fe(NH2Trz)3B10H10 · H2O (II). The complexes were examined by static magnetic susceptibility measurements (2–300 K) and Moessbauer, IR, and electronic spectroscopy. Complex I exhibits the reversible spin transition 1 A 1 ⇄ 5 T 2 and pink ⇄ white thermochromism. The temperatures of the forward and reverse transitions in complex I were 246 and 233 K, respectively. Complex II remained in the high-spin state over the whole temperature range. The sharp decrease in its effective magnetic moment at T 2 ions. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: