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- W185208802 abstract "Modern valence bond theory, in its spin-coupled form, has been used to investigate the nature of hypercoordinate bonding to main group elements. The systems that have been studied in this way include: halides, oxides and oxohalides of phosphorus, sulfur and chlorine; xenon fluorides; SiH5− and CH5−; 1,3-dipoles; oxohalides of hypercoordinate nitrogen; fluorophosphoranes; and YXXY diahalides and dihydrides of dioxygen and disulfur. The bonds involving hypercoordinate atoms tend to be highly polar. We find no significant qualitative differences between the hypercoordinate nature of first-row, second-row and noble gas atoms in appropriate chemical environments, nor between the descriptions of the bonding in hypercoordinate and so-called ‘normal octet’ molecules, except for some differences in bond polarity. We suggest that the ‘octet rule’ be demoted in favour of the democracy principle: almost all valence electrons can participate in chemical bonding if provided with sufficient energetic incentives. Simple concepts of atomic size and of electronegativity differences prove to be of particular utility in qualitative descriptions. We find no evidence for the utilization of d functions as valence orbitals, or to support notions of pπ-dπ back-bonding." @default.
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- W185208802 date "1999-01-01" @default.
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- W185208802 title "Hypercoordinate bonding to main group elements: the spin-coupled point of view" @default.
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- W185208802 doi "https://doi.org/10.1016/s1380-7323(99)80022-3" @default.
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