ISSN:
1042-7163
Keywords:
Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The crystal structures of two pentavalent silicon anions are discussed. The structure of [SiMe3F2]- 1 shows a trigonal bipyramidal structure with the fluorines in apical positions. The Si—F bond distances are the longest known of this type. The crystal structure of fluorosilicate 2 (1,1-diphenyl-1-fluoro-3,3-bis[trifluoromethyl]-1,3-dihydro-2,1-benzoxasilole[ion 1-]) is distorted toward a rectangular structure along the Berry pseudorotation coordinate. The lone Si—F bond distance in 2 is much shorter than that in 1. The ab initio calculations on a variety of pentavalent fluorinated silicon anions are reported, and good agreement with the experimental data are found. Fluoride affinities for the fluorosilanes are reported and are in reasonable agreement with the experimental values where known. The fluoride affinity of the tetra-coordinated species is related to the length of the Si—F bond in the pentavalent anion.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hc.520040225
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