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- W2004134504 abstract "Abstract New pentacoordinated anionic diorganotrifluorosilicates, RR'SiF3 −, were synthesized as potassium 18-crown-6 salts, where RR'= (t-Bu)Ph, (CH2)4, biphenyl-2-yl, and bibenzyl-2-yl. The tetra fluorosilicate [t-BuSiF4][K-18-crown-6], results from a Si-C cleavage reaction of (t-Bu)2SiF2, Dynamic 29Si and 19F NMR measurements for the trifluorosilicates provided definitive evidence establishing the occurrence of intramolecular ligand exchange. A ligand-exchange barrier is determined for the first time for a cyclic pentacoordinated anionic silicate. The exchange pathway is represented by the Berry pseudorotational coordinate. Molecular structures are reported for [Xyl2SiF3][K-18-crown-6] (1), [(t-Bu)PhSiF3][K-18-crown-6] (2), and [(o-Tol)2SiF3][K-18-crown-6] (3) and yield a steric parameter for the pentacoordinated fluorosilicates useful in correlating their reactivity. The xylyl derivative 1 crystallizes in the monoclinic space group P21/c with a =11.069 (3) A, b =16.615 (6) A, c = 17.328 (4) A, β = 100..." @default.
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- W2004134504 date "1995-02-01" @default.
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- W2004134504 title "INTRAMOLECULAR LIGAND EXCHANGE OF PENTACOORDINATED ANIONIC SILICATES, R2SiF3 −, VIA 29Si AND 19F NMR SPECTROSCOPY. SOLUTION- AND SOLID-STATE STRUCTURES" @default.
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- W2004134504 doi "https://doi.org/10.1080/10426509508031345" @default.
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