Strukturchemie von Verbindungen des pentakoordinierten Siliciums. Das Bis(ethylendioxy)methylsilan-Anion / Structural Studies of Pentacoordinate Silicon. The Bis(ethylenedioxy)methylsilane Anion

Open Access

1 February 1982

journal article
Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B

Vol. 37 (2) , 195-197
https://doi.org/10.1515/znb-1982-0214

Abstract

Hexamethylendiammonium-bis(ethylenedioxy)methylsilane crystallizes in the hexagonal space group P6₁22, Z = 6 with a= 11.902(1), c = 30.148(4) A. The structure was refined to R - 0.041 using 2281 independent reflections. The geometry around the pentacoordinate silicon atom is between a trigonal bipyramid and a square pyramid. O_eq-Si-O_eq 136.0(1)°, O_ax-Si-O_ax 161.7(1)°. The Si-O_ax bond lengths are 1.749(2) and 1.769(2) A, the Si-O_eq 1.711(2) and 1.735(2) A, Si-C_eq 1.876(3) A. The compound forms strong N-H ··· O hydrogen bonds between cation and anion. The cation lies on a crystallographic twofold axis

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