High-Temperature Spin Crossover in Complexes of Iron(II) closo-Borates with 2,6-Bis(benzimidazol-2-yl)pyridine
А. Д. Иванова, Л. Г. Лавренова, Е. V. Korotaev, С. В. Трубина, L. A. Sheludyakova, S. A. Petrov, К. Yu. Zhizhin, Nikolay T. Kuznetsov
Abstract
New iron(II) complexes with 2,6-bis(benzimidazol-2-yl)pyridine (L) and closo-borate(2–) anions—[FeL2][B10H10] ⋅ 2H2O and [FeL2][B12H12] ⋅ H2O—have been synthesized. The complexes have been characterized by static magnetic susceptibility measurements, electronic (diffuse reflectance spectra), IR, and EXAFS spectroscopy, and X-ray diffraction analysis. A study of the μeff(T) dependence in the temperature range 80–500 K has shown that the complexes exhibit a high-temperature spin crossover 1А1 ⇔ 5Т2.
Topics & Concepts
Spin crossoverPyridineChemistryBoronAtmospheric temperature rangeCrystallographyMagnetic susceptibilityAbsorption spectroscopyExtended X-ray absorption fine structureMedicinal chemistryOrganic chemistryPhysicsMeteorologyQuantum mechanicsMagnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies