Choice of coordination number in d10 complexes of group 11 metals.
The distribution of di-, tri-, and tetracoordination among the d(10) ions of the group 11 metals is theoretically analyzed by means of density functional calculations on more than 150 model complexes of general formula [MX(m)L(n)](1-m) (where M = Cu, Ag, or Au; L = NH(3) or PH(3); X = Cl, Br, or I; m + n = 2-4). The energy of a ligand association reaction has been found to be practically determined by two contributions: the interaction energy and the energy of deformation of the metal coordination sphere. The larger deformation energy of gold complexes compared to copper and silver ones explains the predominance of dicoordination among Au(I) complexes, in comparison with Cu(I) and Ag(I), for which dicoordination is far less common than tri- and tetracoordination. Other experimental trends can be explained by looking at the fine details of these two energetic components.
Carvajal
M Angels
MA
Centre Especial de Recerca en Química Teòrica, Parc Científic de Barcelona, Av. Baldiri Reixach 10-12, 08028 Barcelona, Spain.
Novoa
Juan J
JJ
Alvarez
Santiago
S