A trimetallic supramolecular complex of osmium(II) and rhodium(III) displaying MLCT transitions in the near-IR

David F. Zigler, Matthew T. Mongelli, Matthew Jeletic, Karen J. Brewer

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

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 languageEnglish
Pages (from-to)295-298
Number of pages4
JournalInorganic Chemistry Communications
Volume10
Issue number3
DOIs
StatePublished - Mar 2007

Keywords

  • Electrochemistry
  • Light absorber
  • NIR
  • Osmium
  • Rhodium
  • Spectroscopy
  • Supramolecular

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