CHED 1255 |
| Recently, there has been an increased interest in the development of sensors utilizing emissive transition metal complexes, especially those with predictable and consistent emission sites. The use of crystalline materials ensures this consistent emission site. Small molecules can reach the emissive metal site and quench the emission via energy transfer. This emission quenching allows the quencher concentration to be determined spectroscopically. Six iridium(III) complexes were synthesized with the general formula [Ir(C^N)2(L)]Cl or [Ir(C^N)2(L′)2]Cl, where (C^N) is an orthometallating ligand, L is a bidentate phosphine or polypyridine, and L′ is an isocyanide. To generate void space within the crystal, each chloride salt was metathesized to a tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (TFPB) salt. TFPB salts generate void space due to poor anion packing and the fluorines allow the small molecules to diffuse into the crystal lattice. One particular complex, [Ir(ppy)2(bpy)]TFPB was completely characterized through measurements of quantum yield, lifetime, and emission spectroscopy. |
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Undergraduate Research Poster Session: Inorganic Chemistry
2:00 PM-4:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster
Division of Chemical Education |