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A Solid-State 1 NMR and Theoretical Study of the Chemical Bonding in Disilenes

1997; American Chemical Society; Volume: 119; Issue: 21 Linguagem: Inglês

10.1021/ja963921b

1943-2984

Robert West, Jefferson D. Cavalieri, Jarrod J. Buffy, Charles G. Fry, Kurt W. Zilm, James C. Duchamp, Mitsuo Kira, Takeaki Iwamoto, Thomas Müller, Yitzhak Apeloig,

Coordination Chemistry and Organometallics

Nine disilenes have been studied by solid-state NMR spectroscopy, under static or slow magic-angle spinning conditions, to determine the 29Si chemical shift tensors. All of the compounds show strong deshielding along one axis and correspondingly large spreads of the tensor components, Δδ (=δ11 − δ33). MO calculations on model disilenes indicate that the deshielding results from a paramagnetic contribution along the in-plane axis perpendicular to the Si−Si vector. lmplications of the NMR data and the theoretical camputations for SiSi bonding are discussed.