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Nature of Alkali- and Coinage-Metal Bonds versus Hydrogen Bonds
Olatz Larrañaga1, Ana Arrieta1, Célia Fonseca Guerra2,3
1Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU), Donostia International Physics Center (DIPC), P. K. 1072, 20018, San Sebastián-Donostia, Spain.
Abstract:
We have quantum chemically studied the structure and nature of alkali- and coinage-metal bonds (M-bonds) versus that of hydrogen bonds between A-M and B- in archetypal [A-M⋅⋅⋅B]- model systems (A, B=F, Cl and M=H, Li, Na, Cu, Ag, Au), using relativistic density functional theory at ZORA-BP86-D3/TZ2P. We find that coinage-metal bonds are stronger than alkali-metal bonds which are stronger than the corresponding hydrogen bonds. Our main purpose is to understand how and why the structure, stability and nature of such bonds are affected if the monovalent central atom H of hydrogen bonds is replaced by an isoelectronic alkali- or coinage-metal atom. To this end, we have analyzed the bonds between A-M and B- using the activation strain model, quantitative Kohn-Sham molecular orbital (MO) theory, energy decomposition analysis (EDA), and Voronoi deformation density (VDD) analysis of the charge distribution.
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