Citation: Nicolas Louvain; Nicolas Mercier; Florent Boucher (2009). \a- to \b-(dmes)BiI5 (dmes = Dimethyl(2-ethylammonium)sulfonium Dication): Umbrella Reversal of Sulfonium in the Solid State and Short I...I Interchain Contacts-Crystal Structures, Optical Properties, and Theoretical Investigations of 1D Iodobismuthates. Inorganic Chemistry, 48, pp. 879-888.