The bonding preference of transition metal species of general formula [(PH3)2M]2(mu-C2X4), where M = Cu or Ag and X = O, S, Se, or Te, and (Cp2Ti)2(mu-C2X4), where X = S or Se, are explored using density functional theory. The relative energies of metal binding to the bridging ligand in a dithiolene-like vs dithiocarbamate-like manner are evaluated. In all cases, the most stable structure corresponds to dithiolene-like (or side-side) bonding, consistent with the vast majority of these compounds which have been experimentally characterized. However, for M = Ag and X = S, Se, or Te, the two isomers are nearly degenerate.
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