Abstract
A spin-crossover iron(II) complex, fac-[FeII(HL n-Hx)3]Cl·PF6 (1), that exhibits stepwise spin transition and thermal hysteresis was synthesized by using the ligand 2-methylimidazol- 4-ylmethylidene-n-hexylamine (HLn-Hx). Four complex cations (fac-[FeII(HLn-Hx)3]2+) and four Cl- anions associate through twelve imidazole···Cl- H bonds to give a tetrameric cubane-like assembly, and one PF6 - anion is encapsulated within the cavity of the cubane. Magnetic susceptibility mea- surements showed a three-step spin transition, and the spincrossover profile became less pronounced as the sweep rate increased. At a sweep rate of 0.5 Kmin-1, the midpoint temperatures of the three steps are Tc(↓) = 131.2, 144.2, and 154.2 K in the heating mode and Tc(↑) = 116.8, 137.8, and 151.8 K in the cooling mode. The respective thermal hystereses were evaluated to be 14.4, 6.3, and 2.4 K wide.
Original language | English |
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Pages (from-to) | 927-933 |
Number of pages | 7 |
Journal | European Journal of Inorganic Chemistry |
Issue number | 5-6 |
DOIs | |
Publication status | Published - Feb 2013 |
Keywords
- Cubane structure
- Hydrogen bonds
- Hysteresis
- Iron
- Spin crossover
- Stepwise SCO
ASJC Scopus subject areas
- Inorganic Chemistry