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Single crystal X-ray studies on bis[3,4,5,6-tetrabromo-1,2-benzenediolato(2−)](pyrrolidiniomethyl)silicate acetonitrile solvate [(C 6 Br 4 O 2 ) 2 SiCH 2 (H)NC 4 H 8  · CH 3 CN; monoclinic,  P 2 1 / 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 CH 3 CN molecule form intermolecular N – H⋯N hydrogen bonds.

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Bis[3,4,5,6-tetrabrom-1,2-benzoldiolato(2−)](pyrrolidiniomethyl)silicat-Acetonitril-Solvat [(C 6 Br 4 O 2 ) 2 SiCH 2 (H)NC 4 H 8  · CH 3 CN]: Synthese sowie Kristall- und Molekülstruktur eines zwitterionischen  λ  5 -Spirosilicats