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• W2045011826 startingPage "8896" @default.
• W2045011826 abstract "Chemical bonding is the stabilization of a molecular system by charge- and spin-reorganization processes in chemical reactions. These processes are said to be local, because the number of atoms involved is very small. With multi-configurational self-consistent field (MCSCF) wave functions, these processes can be calculated, but the local information is hidden by the delocalized molecular orbitals (MO) used to construct the wave functions. The transformation of such wave functions into valence bond (VB) wave functions, which are based on localized orbitals, reveals the hidden information; this transformation is called a VB reading of MCSCF wave functions. The two-electron VB wave functions describing the Lewis electron pair that connects two atoms are frequently called covalent or neutral, suggesting that these wave functions describe an electronic situation where two electrons are never located at the same atom; such electronic situations and the wave functions describing them are called ionic. When the distance between two atoms decreases, however, every covalent VB wave function composed of non-orthogonal atomic orbitals changes its character from neutral to ionic. However, this change in the character of conventional VB wave functions is hidden by its mathematical form. Orthogonal VB wave functions composed of orthonormalized orbitals never change their character. When localized fragment orbitals are used instead of atomic orbitals, one can decide which local information is revealed and which remains hidden. In this paper, we analyze four chemical reactions by transforming the MCSCF wave functions into orthogonal VB wave functions; we show how the reactions are influenced by changing the atoms involved or by changing their local symmetry. Using orthogonal instead of non-orthogonal orbitals is not just a technical issue; it also changes the interpretation, revealing the properties of wave functions that remain otherwise undetected." @default.
• W2045011826 created "2016-06-24" @default.
• W2045011826 creator A5007556540 @default.
• W2045011826 date "2015-04-21" @default.
• W2045011826 modified "2023-10-16" @default.
• W2045011826 title "Chemical Bonding: The Orthogonal Valence-Bond View" @default.
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• W2045011826 doi "https://doi.org/10.3390/ijms16048896" @default.
• W2045011826 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4425115" @default.
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• W2045011826 hasPublicationYear "2015" @default.
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