Lattice effects in the Mössbauer spectra of salts of [Fe4S4(SBut)4]2–. Crystal structures of [NMe4]2[Fe4S4(SBut)4]·HSButand [N(n-C5H11)4]2[Fe4S4(SBut)4]·HSBut
David J. EvansAdrian HillsDavid L. HughesG.J. LeighAndrew HoultonJack Silver
Abstract
The Mössbauer spectra of salts containing the anions [Fe4S4(SBut)4]2– or [FeX4]2–(X = Cl or Br) show relatively invariant isomer shifts, but quadrupole splittings which are cation-dependent, for example varying from 0.84 to 1.32 mm s–1 for [NR4]2[Fe4S4(SBut)4]. This observation is rationalized in terms of perturbations exerted by the cations on the field gradient at the iron centres. As aids to this rationalization, the X-ray crystal structures of [NMe4]2[Fe4S4(SBut)4]·HSBut and of [N(n-C5H11)4]2[Fe4S4(SBut)4]·HSBut were determined.
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