TY  - JOUR
A1  - Tacke, Reinhold
A1  - Sperlich, Jörg
A1  - Strohmann, Carsten
A1  - Frank, Brigitta
A1  - Mattern, Günter
T1  - 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 [lambda]5-Spirosilicats
N2  - Single crystal X-ray studies on bis[3,4,5,6-tetrabromo-1 ,2-benzenediolato(2- )](pyrrolidiniomethyl)silicate acetonitrile solvate [(C6Br40 2hSiCH2(H)NC4H8 · CH3CN; monoclinic, P2t/c, a = 808.5(4), b = 1533.0(8), c = 2212.6(1) pm, ß = 97.67(2)0 , 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 trigonalbipyramidal 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.
KW  - Kristallstruktur
KW  - Spirosilicate
KW  - crystal structure
KW  - zwitterionic spirosilicate
Y1  - 1992
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-86884
ER  - 
TY  - JOUR
A1  - Tacke, Reinhold
A1  - Lopez-Mras, A.
A1  - Becht, J.
A1  - Sheldrick, W. S.
T1  - Synthese sowie Kristall- und Molekülstruktur von Tetrafluoro[2-(pyrrolidinio)ethyl]silicat
T1  - Synthesis and Crystal and Molecular Structure of Tetrafluoro[2-(pyrrolidinio)etbyl]silicate
N2  - Das zwitterionische Tctratluoro[2-(pyrrolidinio) ethyl]silicat (4) wurde durch Reaktion von Trimethoxy( 2-pyrrolidinoethyl)silan (5) mit Fluorwasserstoff in einem Ethanol/Flußsäure-Gemisch bei 0 °C synthetisiert. Die Kristall- und Molekülstruktur von 4 wurde bei - 100 °C mittels einer Einkristall-Röntgenstrukturanalyse untersucht. Außerdem wurde 4 durch NMR-Untersuchungen in Lösung charakterisiert (CD\(_3\)CN: \(^1\)H, \(^{13}\)C).
N2  - The zwitterionic tetrafluoro[2-(pyrrolidinio) ethyl]silicate (4) was synthesized by reaction of trimethoxy( 2-pyrrolidinoethyl)silane (5) with hydrogen fluoride in elhanollhydrofluoric acid at 0 °C. The crystal and mo1ecular structure of 4 was studied at - 100 °C by singlc-crystal X-ray diffraction. ln addition, 4 was characterized by solution-state NMR sturlies (CD\(_3\)CN: \(^1\)H, \(^{13}\)C).
KW  - Anorganische Chemie
KW  - Zwitterionic
KW  - Lambda5-organofluorosilicate
KW  - pentacoordinate silicon
KW  - crystal structure
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-64269
ER  -