Journal
CHEMICAL PHYSICS LETTERS
Volume 405, Issue 1-3, Pages 148-152Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2005.02.013
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The geometries of the A-frame molecules S(MPH3)(2) (M = Cu, Ag, An) are optimized at the HF, MP2, MP3, MP4, CCSD, and CCSD(T) levels using 19-valence-electron pseudopotentials. The M-M distances show oscillations which increase in the order Ag < Au < Cu. This result qualitatively parallels recent findings for the metallophilic bond strength by O'Grady and Kaltsoyannis [E. O'Grady, N. Kaltsoyannis. Phys. Chem. Chem. Phys. 6 (2004) 680.]. Local MP2 and local CCSD calculations were also performed for comparison. These methods allow to partition the correlation contributions to the M-M interaction energy into dispersion and ionic terms. The latter were found to be unprecedently important for M = Cu. (c) 2005 Elsevier B.V. All rights reserved.
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