4.7 Article

Bonding and antibonding characters of the first order reduced density matrix. A new look at two charge-shift bonds

Journal

JOURNAL OF CHEMICAL PHYSICS
Volume 158, Issue 1, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0126072

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This article presents a novel approach to analyzing chemical bonds using the gradient of a first order reduced density matrix (1-RDM) map. The bonds are divided into atomic core, valence, and dorsal regions, which can be further characterized as bonding or antibonding. The study shows that this method can reveal fundamental differences in charge-shift bonds that are not detected by density-based analysis or valence bond theory, indicating the importance of the gradient of 1-RDM in bond analysis.
This article reports a new way of analyzing chemical bonds based on the use of gradient of a first order reduced density matrix (1-RDM) map to partition bonds into atomic core, valence, and dorsal regions that can be further characterized as bonding or antibonding. These classifications are directly related to the familiar language of molecular orbital analysis. Analyses based on these quantities and the critical points of the 1RDM performed on two charge-shift bonds show that although they share common features, there are fundamental differences in these interactions that are detected neither by density-based analysis nor by valence bond theory. The results suggest the gradient of 1-RDM as a valuable tool in bond analysis.

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