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Zur Existenz zwitterionischer λ 5 ‐(Ammonioorganyl)tetrafluorosilicate: Synthese sowie Kristall‐ und Molekülstruktur von Tetrafluoro(pyrrolidiniomethyl)silicat
Author(s) -
Tacke Reinhold,
Becht Joachim,
Mattern Günter,
Kuhs Werner F.
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250907
Subject(s) - chemistry , molecule , crystallography , crystal structure , trigonal bipyramidal molecular geometry , silicon , yield (engineering) , silicate , silane , stereochemistry , organic chemistry , materials science , metallurgy
On the Existence of Zwitterionic λ 5 ‐(Ammonioorganyl)tetrafluorosilicates: Synthesis and Crystal and Molecular Structure of Tetrafluoro(pyrrolidiniomethyl)silicate The zwitterionic tetrafluoro(pyrrolidiniomethyl)silicate ( 6 ) was synthesized by the reaction of trimethoxy(pyrrolidinomethyl)silane ( 7 ) with hydrogen fluoride in ethanol/hydro‐fluoric acid (yield 83%). 6 crystallizes in the space group P 1 / c with two crystallographically distinct molecules in the asymmetric unit. In both molecules the pentacoordinate silicon atom is surrounded by four fluorine atoms and one carbon atom, the latter being in an equatorial position. The coordination polyhedron of the silicon atoms can be described as a slightly distorted trigonal bipyramid. The zwitterionic structure was also proved for dissolved 6 (solution in CD 3 CN, NMR‐spectroscopic studies).