The unprecedented Tetrakis-(disulfato)-silicate anion [Si(S2O7)4]4−, its germanium congener [Ge(S2O7)4]4−, and the Tris-(disulfato)-metallates [M(S2O7)3]2− (M=Si, Ge, Ti), stabilized by divalent counter cations B2+ (B=Sr, Ba, Pb)
von Christian Logemann ; Katja Rieß ; Mathias S. Wickleder