Magnetic behavior and Mössbauer spectra of spin-crossover pyrazolate bridged dinuclear diiron(ii) complexes: X-ray structures of high-spin and low-spin [{Fe(NCBH3)(py)}2(μ-bpypz)2]

Abstract

The synthesis and characterization of new spin-crossover pyrazolato bridged dinuclear [{Fe^II(NCS)(py)}₂(μ-bpypz)₂] and the corresponding cyanotrihydroborato-κN complexes are described together with the X-ray crystal analysis of the latter in both the high-spin and low-spin states as well as the variable temperature magnetic susceptibility and/or Mössbauer spectra demonstrating the spin-crossover which exhibits an one-step process, but not a two-step one characteristic of the known bpym bridged dinuclear complexes.