Singly charged lambda Si-6-silicate anions with an SiF5C skeleton: Syntheses and crystal structure analyses of the ionic hexacoordinate silicon compounds [Me3NH][F-5 SiCH2NMe2H]center dot H2O and [Me3NH][F5SiCH2NMe3]center dot H2O

Authors
Pulm, M Becht, J Tacke, R
Citation
M. Pulm et al., Singly charged lambda Si-6-silicate anions with an SiF5C skeleton: Syntheses and crystal structure analyses of the ionic hexacoordinate silicon compounds [Me3NH][F-5 SiCH2NMe2H]center dot H2O and [Me3NH][F5SiCH2NMe3]center dot H2O, Z NATURFO B, 55(1), 2000, pp. 60-64
Citations number
24
Categorie Soggetti
Chemistry
Journal title
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
ISSN journal
09320776 → ACNP
Volume
55
Issue
1
Year of publication
2000
Pages
60 - 64
Database
ISI
SICI code
0932-0776(200001)55:1<60:SCLSAW>2.0.ZU;2-7
Abstract
The zwitterionic lambda(5)Si-tetrafluorosilicates F4SiCH2NMe2H (1) and F4Si CH2NMe3 (2) behave as Lewis acids and react with [Me3NH]F (molar ratio 1:1) in aqueous solution to yield the ionic lambda(6)Si-pentafluorosilicates [M e3NH][F5SiCH2NMeH] (3) and [Me3NH][F5SiCH2NMe3] (4) respectively. These hex acoordinate silicon compounds contain singly charged lambda(6)Si-silicate a nions ([F5SiCH2NMe2H](-), [F5SiCH2NMe3](-)) with an SiF5C skeleton. Compoun ds 3 and 4 were isolated as the crystalline hydrates 3 . H2O (yield 80%) an d 4 . H2O (yield 82%) which were structurally characterized by single-cryst al X-ray diffraction. The Si-coordination polyhedra in the crystals of 3 . H2O and 4 . H2O are slightly distorted octahedra.