Abstract
The spin-crossover behaviors of mixed-valence iron compounds [Fe IIH3L][FeIIIL](NO3)2 (1) and [FeIIH3LMe][FeIIIL Me](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 Fe II-LS FeIII→HS FeII-LS Fe III→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.
Original language | English |
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Pages (from-to) | 397-402 |
Number of pages | 6 |
Journal | Hyperfine Interactions |
Volume | 166 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - Nov 1 2005 |
Keywords
- Hydrogen bonds
- Iron complex
- Mixed-valence
- Mössbauer spectroscopy
- Spin-crossover
- Tripod ligand
- Two-dimensional structure
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Condensed Matter Physics
- Physical and Theoretical Chemistry