Abstract
The mixed-metal supramolecule [{(tpy)OsCl(dpp)}2RhCl2](PF6)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)](PF6) is synthesized by the reaction of [(tpy)OsCl3] and dpp in ethylene glycol. The supramolecular complex [{(tpy)OsCl(dpp)}2RhCl2](PF6)3 is prepared by reaction of the monometallic synthon with RhCl3 · 3H2O in ethanol/water. Cyclic voltammetry shows an irreversible reduction for [{(tpy)OsCl(dpp)}2RhCl2](PF6)3 at -0.51 V (vs. Ag/AgCl) corresponding to the RhIII/II/I couple. The RhIII/II/I couple is anodic to the first dpp0/- 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)}2RhCl2](PF6)3 absorbing strongly throughout the 200-1000 nm region.
Original language | English |
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Pages (from-to) | 295-298 |
Number of pages | 4 |
Journal | Inorganic Chemistry Communications |
Volume | 10 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2007 |
Keywords
- Electrochemistry
- Light absorber
- NIR
- Osmium
- Rhodium
- Spectroscopy
- Supramolecular