A new iron(II) spin‐crossover compound containing a phosphane ligand has been synthesized and characterized by magnetic susceptibility, Mössbauer spectroscopy, and heat capacity and photomagnetic experiments. The [Fe(tppb)Br2] complex [tppb = 1,2,4,5‐tetrakis(diphenylphosphanyl)benzene] exhibits a gradual spin conversion at T1/2 = 184 K, and displays at low temperature a partial photoconversion of the low‐spin (LS) state into the metastable high‐spin (HS) state by irradiating the sample at 530 nm. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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Rosa et al. (2004) studied this question.