Abstract
Energy partitioning schemes have been used to investigate the metallophilic attraction between gold, silver and copper atoms in model dimers of H-M-PH₃ and Cl-M-PH₃ type. Attraction between the monomers is found to be largest for M = Au, but the reduction from Au to Ag (Cu) is not more than 10-20\% (25-35\%). Equilibrium M-M distances, re(M-M), decrease by 0.2-0.3 A from Au to Cu, and by 0.1-0.2 A from Cl to H. An analysis of the intermolecular interaction energy shows that at re(M-M) dispersive and non-dispersive components are about equally important for all systems considered. However, the contribution due to metal nd-nd interaction falls drastically from 43\% (35\%) for Au, over 30\% (27\%) for Ag, to 18\% (13\%) for Cu in the H (Cl) compounds.
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