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Three-center four-electron bond
The 3-center 4-electron bond is a model used to explain bonding in certain hypervalent molecules such as tetratomic and hexatomic interhalogen compounds, sulfur tetrafluoride, the xenon fluorides, and the bifluoride ion.〔 p. 897.〕〔Weinhold, F.; Landis, C. ''Valency and bonding'', Cambridge, 2005; pp. 275-306.〕 It is also known as the Pimentel–Rundle three-center model after the work published by George C. Pimentel in 1951,〔Pimentel, G. C. The Bonding of Trihalide and Bifluoride Ions by the Molecular Orbital Method. ''J. Chem. Phys.'' 1951, ''19'', 446-448. 〕 which built on concepts developed earlier by Robert E. Rundle for electron-deficient bonding.〔Rundle, R. E. Electron Deficient Compounds. II. Relative Energies of "Half-Bonds". ''J. Chem. Phys'' 1949, ''17'', 671–675.〕 An extended version of this model is used to describe the whole class of hypervalent molecules such as phosphorus pentafluoride and sulfur hexafluoride as well as multi-center pi-bonding such as ozone and sulfur trioxide.
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