Solution luminescence from chloro(2,2′:6′,2″-terpyridine)platinum(II) chloride in micelles |
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Authors: | Natalie A Larew |
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Institution: | Department of Chemistry, Kenyon College, Gambier, OH 43022, United States |
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Abstract: | Previously characterized as being non-luminescent in room-temperature fluid solution, the coordination compound chloro(2,2′:6′,2″-terpyridine)platinum(II) chloride can display two types of luminescence in certain microenvironments. In aqueous solutions of anionic and neutral surfactants having concentrations near or above their critical micelle concentration, Pt(terpy)Cl]Cl (10-50 μM) displays broad emission centered at ∼610 nm that is characterized as metal-to-ligand charge transfer phosphorescence (3MLCT). In high concentration (10-100 mM) solutions having no surfactant, Pt(terpy)Cl]Cl aggregates form. Excitation in the 470-540 nm region results in a long-wavelength emission centered at ∼720 nm that is characterized as metal-metal-to-ligand charge transfer phosphorescence (3MMLCT). This emission can also be detected in lower concentration solutions (10-50 μM) with surfactant concentration below its critical micelle concentration. Enhancement of 3MLCT luminescence is also found for the related phenylacetylide complex cation Pt(terpy)(C CPh)]+ in micelles of the anionic surfactant sodium dodecyl sulfate. |
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Keywords: | Platinum complexes Terpyridine Photoluminescence Surfactants Micelles Aggregation |
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