Volume 11, Issue 5 pp. 341-352
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An electron localization function investigation of bonding in some simple four-coordinate nitrogen and phosphorus compounds

D. B. Chesnut

Corresponding Author

D. B. Chesnut

P. M. Gross Chemical Laboratory, Duke University, Durham, North Carolina 27708

P. M. Gross Chemical Laboratory, Duke University, Durham, North Carolina 27708Search for more papers by this author

Abstract

The bonding in some simple four-coordinate species involving nitrogen and phosphorus has been studied by the electron localization function (ELF) approach and compared to that in their conventionally singly and doubly bonded counterparts. Despite evidence suggesting the presence of a conventional multiple bond in certain cases of the four-coordinate species, the ELF study shows this not to be the case. Rather, the situation is better pictured as, for example, in the case of H3PCH2as chemical structure image where both ionic and covalent interactions are present, a type of bond we term cov-ionic. While the ionic interaction is generally strong, the covalent part can be weak, as in the case of the four-coordinate nitrogen compounds, or strong, as in the case of the four-coordinate phosphorus species. The quantum mechanically determined properties of the cov-ionic bonded compounds are consistent with this picture. © 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:341–352, 2000

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