Electron Diffraction Investigation of Tetramethylcyclodi- and Hexamethylcyclotrisilthiane

Yokoi, Masatoki; Nomura, Terunosuke; Yamasaki, Kazuo

doi:10.1021/ja01622a011

Cited by 27 publications

(2 citation statements)

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“…Experimentally determined structures of a number of other four-membered rings related to cyclodisiloxanes do not show the existence of abnormally short Si..Si contacts. These include rings containing nitrogen, _2:2.59/~ (Parkanyi et al 1980), carbon, _3:2.70/~ (Vilkov et al 1968), and sulphur, 4 2.84 A (Yokoi et al 1955;Yokoi 1957). Thus, oxygen appears to be unique in inducing a phantom bond, among the structures studied.…”

Section: Introductionmentioning

confidence: 91%

Factors contributing to phantom bonds in inorganic molecules: Interpretations and predictions

Rathna

Chandrasekhar

1994

Proc. Indian Acad. Sci. (Chem. Sci.)

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The validity of various qualitative proposals for interpreting and predicting the existence of short contacts between formally non-bonded atoms, as in cyclodisiloxane and related inorganic ring systems, is critically evaluated. The models range from simple considerations of geometric constraints, lone pair repulsions and n-complex formation to proprsals such as the unsupported 7t-bond model and the a-bridged-~ bond concept. It is pointed out that a unified description based on a combination of closed and open 3-centre 2-electron bonds is possible. The role of hybridisation is emphasized in the short phantom bond computed in an earlier model system. These insights are used to predict structures with exceptionally short Si..Si and B..B phantom bonds. The proposals are confirmed by ab initio calculations.

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