6533b7ddfe1ef96bd12747e7

RESEARCH PRODUCT

Tuning the spin crossover above room temperature: iron(II) complexes of substituted and deprotonated 2,6-bis(benzimidazol-2-yl)pyridine

Hartmut FuessWolfgang HaaseMiroslav BočaMartina Vrbová-schikoraGuido KickelbickWolfgang LinertFranz RenzRoman Boča

subject

Inorganic ChemistryCrystalCrystallographyHysteresischemistry.chemical_compoundDeprotonationNuclear magnetic resonancechemistrySpin crossoverPyridineMaterials ChemistrySpin transitionPhysical and Theoretical Chemistry

description

Abstract The complex [Fe(tzimpy)2](ClO4)2 · 2H2O (tzimpy = 2,4,6-tris-(benzimidazol-2-yl)pyridine) shows an abrupt spin crossover (S = 0–2 transition) above room temperature centered at Tc = 323 K with a hysteresis width of ΔT = 35 K. The neutral iron(II) complex with deprotonated bzimpy ligands (bzimpy = 2,6-bis(benzimidazol-2-yl)pyridine) exhibits a gradual spin transition on the first heating with Tc = 424 K. There are irreversible changes between T = 503 and 523 K: the liberation of the crystal water, the color change (blue–green) followed by a structure change. Next thermal cycles are reproducible though, heating/cooling paths are different from the first heating.

yearjournalcountryeditionlanguage
2005-02-01Inorganic Chemistry Communications
https://doi.org/10.1016/j.inoche.2004.12.014