Iron(II) Complexes with 4-R-1,2,4-Triazoles (R = Ethyl, Propyl, Isopropyl): Synthesis and Properties
作者:M. B. Bushuev、L. G. Lavrenova、V. N. Ikorskii、Yu. G. Shvedenkov、V. A. Varnek、L. A. Sheludyakova、S. V. Larionov
DOI:10.1023/b:ruco.0000022805.47477.75
日期:2004.4
Fe(II) complexes with 4-R-1,2,4-triazoles of compositions FeL(3)A(2) . nH(2)O (where L is 4-propyl-1,2,4-triazol; A is Br- (n = 4), CF3SO3- (n = 5)), and FeL(2)A(2) . nH(2)O (where L are 4-ethyl-, 4-propyl-, 4-isopropyl- 1,2,4-triazoles (Ettrz, Prtrz, Iprtrz, respectively), A = NCS-, NO3- (n = 0-2)) were synthesized. Magnetochernical studies revealed that FeL(3)A(2) . nH(2)O complexes exhibit reversible spin transition (ST) (1)A(1) reversible arrow T-5(2) that is accompanied by thermochromism (a reversible change of color rose reversible arrow white). The temperatures of direct (Tsup arrow) and reverse (Tsdown arrow) spin transitions are, respectively, 252 and 247 K for Fe(Prtrz)(3)Br-2 . (H2O)-H-4 and 207 and 202 K for Fe(Prtrz)(3)(CF3SO3)(2) . 5H(2)O. Dehydration of the complexes is attended by significant changes in the type and temperatures of ST.