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Iron-sulfur polymetallic centers pose interesting questions on the oxidation state of each metal ion, on the possibility of electron delocalization over the metal ions versus the possibility of existence of equilibria among different localized-valence states, and on the factors determining if, and to what extent, electron delocalization is present. By interpreting the hyperfine coupling of unpaired...
Based on the observations of the cooperative E ⊗ ε Jahn-Teller effect (JTE) in compounds with the hexagonal perovskite structure (ABX3 2L compounds with an h-stacking) the occurrence and non-occurrence of helical structures as e.g. in CsCuCl3 and [N(CH3 )4]CuCl3 (TMCuCl3) are discussed. In particular the relative magnitude of the radii of Rb+ and Cs+ with respect to the radius of CI can explain the...
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