| Autor: |
Bobo MV; Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States., Paul A; Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States., Robb AJ; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States., Arcidiacono AM; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States., Smith MD; Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States., Hanson K; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States., Vannucci AK; Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States. |
| Abstrakt: |
In this report, the synthesis and characterization of two bis-cyclometalated iridium(III) complexes are presented. Single-crystal X-ray diffraction shows that [Ir(ppy) 2 (4,4'-bis(diethylphosphonomethyl)-2,2'-bipyridine)]PF 6 adopts a pseudooctahedral geometry. The complexes have an absorption feature in the near-visible-UV region and emit green light with excited-state lifetimes in hundreds of nanoseconds. The redox properties of these complexes show reversible behavior for both oxidative and reductive events. [Ir(ppy) 2 (4,4'-bis(phosphonomethyl)-2,2'-bipyridine)]PF 6 readily binds to metal oxide supports, like nanostructured Sn IV -doped In 2 O 3 and TiO 2 , while still retaining reversible redox chemistry. When incorporated as the photoanode in dye-sensitized solar cells, the devices exhibit open-circuit voltages of >1 V, which is a testament to their strength of these iridium(III) complexes as photochemical oxidants. |
