Magnetic behavior and Mossbauer spectra of spin-crossover pyrazolate bridged dinuclear diiron(II) complexes: X-ray structures of high-spin and low-spin [{Fe(NCBH_3)(py)}_2(μ-bpypz)_2]

摘要

The synthesis and characterization of new spin-crossover pyrazolato bridged dinuclear [{FeII(NCS)(py)}_2(μ-bpypz)_2] and the corresponding cyanotrihydroborato-N 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 Mossbauer 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.