|
|||||
|
|
Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand |
|
| Authors: | S. Iijima F. Mizutani O. Niwa N. Matsumoto Y. Sunatsuki M. Kojima |
| Affiliation: | (1) National Institute of Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan;(2) Department of Chemistry, Faculty of Science, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555, Japan;(3) Department of Chemistry, Faculty of Science, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8555, Japan |
| Abstract: | The spin-crossover behaviors of mixed-valence iron compounds [FeIIH3L][FeIIIL](NO3)2 (1) and [FeIIH3LMe][FeIIILMe](NO3)2 (2) have been investigated by 57Fe Mössbauer spectroscopy, where H3L is a hexadentate N6 tripod ligand containing three imidazole groups and H3LMe is its 2-methylimidazole derivative. Deconvolution analyses of the Mössbauer spectra revealed that a two-step SCO (LS FeII–LS FeIII→HS FeII–LS FeIII→HS FeII–HS FeIII) proceeds in each compound on elevating the temperature. Compound 2 exhibited lower spin-transition temperatures than 1. “Frozen-in effect” was observed below 120 and 50 K for 1 and 2, respectively. |
| Keywords: | spin-crossover mixed-valence M?ssbauer spectroscopy iron complex tripod ligand two-dimensional structure hydrogen bonds |
| 本文献已被 SpringerLink 等数据库收录！ | |