ANIONIC FIVE-COORDINATED CYCLIC ORGANOFLUOROSILICATES VARYING IN RING SIZE FROM FIVE- TO SEVEN-MEMBERED

Autor: Stephen E. Johnson, Lori Howe, Joan A. Deiters, Joan M. Holmes, Roberta O. Day, Channareddy. Sreelatha, Robert R. Holmes
Rok vydání: 1995
Předmět:
Zdroj: Phosphorus, Sulfur, and Silicon and the Related Elements. 100:87-105
ISSN: 1563-5325
1042-6507
DOI: 10.1080/10426509508037702
Popis: Synthesis of the potassium crown ether complexes (K, 18-c-6) 3 and 4 of the anionic five-coordinated spirocyclic fluorosilicates from the precursor fluorosilanes has provided additional members of this new class of silicon compounds. Silicates 3 and 4 are monofluoro catecholate derivatives [(CH2) n SiF(O2C6H4)]−, containing the five-membered tetramethylene (n = 4) and six-membered pentamethylene (n = 5) ring system, respectively. X-ray analyses of these fluorosilicates are reported along with that of the previously synthesized related monocyclic anionic fluorosilicates [BiPhSiF3][K, 18-c-6] (1) and [BiBzSiF3][K, 18-c-6] (2). The first structural characterization of a pentacoordinated silicon compound containing a seven-membered ring is provided by 2. The study also yields the first structure of a fluorosilicate containing a six-membered ring (4). The geometries are all trigonal bipyramids. Silicates 2–4 have carbon-containing rings positioned diequatorially, whereas the trifluorosilicate 1, with ...
Databáze: OpenAIRE
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