Bis[3,4,5,6-tetrabrom-1,2-benzoldiolato(2−)](pyrrolidiniomethyl)silicat-Acetonitril-Solvat [(C6Br4O2)2SiCH2(H)NC4H8 · CH3CN]: Synthese sowie Kristall- und Molekülstruktur eines zwitterionischen λ5-Spirosilicats

Reinhold Tacke, Jörg Sperlich, Carsten Strohmann, Brigitta Frank,  and Günter Mattern


Single crystal X-ray studies on bis[3,4,5,6-tetrabromo-1,2-benzenediolato(2−)](pyrrolidiniomethyl)silicate acetonitrile solvate [(C6Br4O2)2SiCH2(H)NC4H8 · CH3CN; monoclinic, P21/c, a = 808.5(4), b = 1533.0(8), c = 2212.6(1) pm, β = 97.67(2)°, Z = 4] revealed a zwitterionic structure with a pentacoordinate, formally negatively charged silicon atom and a positively charged ammonium moiety. The silicon atom is surrounded by four oxygen atoms and one carbon atom in a trigonal-bipyramidal fashion, with the carbon atom in an equatorial position. The structure is displaced by 7.0% from the trigonal bipyramid towards the square pyramid. The zwitterion and the CH3CN molecule form intermolecular N – H⋯N hydrogen bonds.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.