Mössbauer and Magnetic Susceptibility Investigation of the 5T2−1A1 Crossover in Some Octahedral Ferrous Complexes in the Solid State

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Abstract
Octahedral ferrous chelates based on the hydrotris (1-pyrazolyl) borate ligand can be prepared which are fully high spin, or are fully low spin, or have an intermediate magnetic moment which is strongly temperature dependent. Mössbauer and magnetic susceptibility data characterizing this behavior in the solid state are presented and analyzed. The orbital splitting of the high spin ground state due to a trigonal component in the octahedral crystal field is ∼1000 cm−1 leaving an orbital singlet lowest. The thermal relaxation time between the singlet and quintet manifolds is anomalously long, leading to the observation of separate Mössbauer transitions for the two electronic states.

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