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- W2912502893 abstract "Abstract There are many examples of atoms in molecules that violate Lewis’ octet rule, because they have more than four electron pairs assigned to their valence. These atoms are referred to as hypervalent. However, hypervalency may be regarded as an artifact arising from Lewis’ description of molecules, which is based on the assumption that electrons are localized in two‐center two‐electron bonds and lone pairs. In the present paper, the isoelectronic phosphate (PO 4 3− ), sulfate (SO 4 2− ) and perchlorate (ClO 4 − ) anions were examined with respect to the concept of hypervalency. Lewis formulas containing a hypervalent central atom exist for all three anions. Based on X‐ray wavefunction refinements of high‐resolution X‐ray diffraction data of representative crystal structures (MgNH 4 PO 4 ⋅6 H 2 O, Li 2 SO 4 ⋅H 2 O, and KClO 4 ), complementary bonding analyses were performed. In this way, experimental information from the new field of quantum crystallography validate long‐known facts, or refute long‐standing misunderstandings. It is shown that the P−O and S−O bonds are highly polarized covalent bonds and, thus, the increase in the valence population following three‐center four‐electron bonding is not sufficient to yield hypervalent phosphorus or sulfur atoms, respectively. However, for the highly covalent Cl−O bond, most bonding indicators imply a hypervalent chlorine atom." @default.
- W2912502893 created "2019-02-21" @default.
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- W2912502893 date "2019-03-14" @default.
- W2912502893 modified "2023-10-16" @default.
- W2912502893 title "Revisiting a Historical Concept by Using Quantum Crystallography: Are Phosphate, Sulfate and Perchlorate Anions Hypervalent?" @default.
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- W2912502893 doi "https://doi.org/10.1002/chem.201806247" @default.
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