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Some octahedral iron(II) complexes assume two spin states low spin (LS, S=0 singlet t2g eg ) at low temperature and high spin (HS, S=2, quintet t2g eg )) at high temperature. Cooperative interactions between spin-active centres will lead to temperature-dependent correlations between spin states in the crystal structure. In order to elucidate the corresponding correlation length, synchrotron diffraction and small-angle scattering experiments have been done for Fe(2-pic)3]Cl2 2-propanol solvate [1]. X-ray diffraction does not reveal any noticeable diffuse scattering. The SANS signal shows no effects other than the dependence of crystal density on temperature. Thus both experiments corroborate the presence of mainly long-range correlations between HS and LS states and support a mean-field scenario of the temperature-induced spin crossover [2, 3].

A complex spin crossover scenario as seen by synchrotron diffraction and small angle neutron scattering