Abstract
The mixed-metal supramolecule [{(tpy)OsCl(dpp)} 2RhCl 2](PF 6) 3 and the monometallic synthon [(tpy)OsCl(dpp)] (tpy = 2,2′:6′,2″-terpyridine, dpp = 2,3-bis(2-pyridyl)pyrazine) have been synthesized and studied by exploring redox and light absorbing properties. The complex [(tpy)OsCl(dpp)](PF 6) is synthesized by the reaction of [(tpy)OsCl 3] and dpp in ethylene glycol. The supramolecular complex [{(tpy)OsCl(dpp)} 2RhCl 2](PF 6) 3 is prepared by reaction of the monometallic synthon with RhCl 3 · 3H 2O in ethanol/water. Cyclic voltammetry shows an irreversible reduction for [{(tpy)OsCl(dpp)} 2RhCl 2](PF 6) 3 at −0.51 V (vs. Ag/AgCl) corresponding to the Rh III/II/I couple. The Rh III/II/I couple is anodic to the first dpp 0/− couple, predicting a lowest lying metal-to-metal charge transfer electronic excited state. Both the monometallic and trimetallic complexes absorb in the near-IR, with [{(tpy)OsCl(dpp)} 2RhCl 2](PF 6) 3 absorbing strongly throughout the 200–1000 nm region.
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