Chemistry associated with multinuclear metal species can be significantly different from chemistry that occurs at a single center, especially for reactions in which a metal-metal bond can be ruptured or formed during the chemical event. Small molecules often can be added across both metal centers in dinuclear gold complexes and certain polynuclear species. This oxidative addition process appears to involve the presence of excited states lowered in energy by the metal-metal interactions. These excited states have been observed in optical emission measurements. The excited states are influenced by solvent, solid state structure, and the presence of heterometallic species near the Au(I). The excited state in dinuclear Au(I) complexes also appears to contain stronger metal-metal bonding found in the ground state.
Metal-metal interactions also are observed in closed shell Cu(I) and Ag(I) complexes. Other metal ions such as Tl(I) and Pt(II) have been observed with heteroatom metal-metal interactions. How these interactions influence reaction chemistries generally remains to be understood.
Since closing my laboratory in 2012, I have continued to edit "Comments on Inorganic Chemistry" and "Profiles in Inorganic Chemistry" as well as refereeing manuscripts involving mainly Group 11 compounds.
Hanan E. Abdou, Ahmed A. Mohamed, José M. López-de-Luzuriaga, Miguel Monge, John P. Fackler, Jr., Fine-Tuning the Luminescence and HOMO?LUMO Energy Levels in Tetranuclear Gold(I) Fluorinated Amidinate Complexes. Inorg Chem, 2012, 51, 2010-2015.
John P. Fackler, Jr. Group 11 Still Produces Fascinating Chemistry Novel Findings Regarding Metal-metal Interactions and Structures of Closed Shell nd10 Copper(I) and Gold(I). Comments on Inorg. Chem., 31, 104-110, 2010.
Abdou, Hanan E.; Mohamed, Ahmed A.; Fackler, Jr., John P., Gold(I) Nitrogen Chemistry, "Gold Chemistry, Applications and Future Directions in the Life Sciences", editor, Fabian Mohr, 2009 WILEY-VCH Verlag GmbH & Co, KGaA, Weinheim, Germany, pp. 1-37.
CO Oxidation over Au/TiO2 preparedfrom metal-organic gold complexes. Yan, Z.; Chinta, S.; Mohamed, A.A., Fackler, J. P., Jr.; Goodman, D. W., Catalyst Letters, 2006, 111(1-2), 15-18.
"Photophysics of supramolecular binary stacks consisting of electron-rich trinuclear Au(I) and organic electrophiles." Mohammad A. Omary, Ahmed A. Mohamed, Manal A. Rawashdeh-Omary, John P. Fackler, Jr., Coordination Chemistry Reviews, 2005, 249, 1372-81.