A re-examination of [NMe4]2[FeCl4] by Mössbauer spectroscopy has revealed the presence of a phase transition at 239 K. The temperature dependence of the quadrupole splitting deviates markedly from theoretical prediction on the basis of a tetragonal distortion. Possible causes are discussed including in particular the effects of vibronic interactions.
T. C. Gibb, N. N. Greenwood and M. D. Sastry, J. Chem. Soc., Dalton Trans., 1972, 1947 DOI: 10.1039/DT9720001947
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