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Luminescence Linewidth Broadening and Nonradiative Energy Transfer Studies of Solid UO2+ 2 -Datura

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The emission spectra and fluorescence decay curves of solid UO2+ 2 -Datura at liquid nitrogen temperature have been measured. The linewidth of the emission peaks of UO2+ 2 ions in UO2+ 2 -Datura decreases with the UO2+ 2 concentration. This linewidth broadening phenomenon can be explained by the existence of resonance interactions between adjacent UO2+ 2 -Datura species. The analysis of the emission peak position of the bound ions has been used to provide a measure of the electronic factors contributing to the interaction between the uranyl ion and phosphoryl and dicarboxyl moieties on the cell wall material. An observed blue shift of the uranyl fluorescence spectrum as a function of solution pH has been ascribed to a distortion of the normally linear O-U-O bond. An inter and intra-molecular nonradiative energy transfer model has been successfully used to interpret the measured lifetime data of UO2+ 2 -Datura.

Keywords: Biomass material; Fluorescence lifetime; Laser-induced fluorescence spectroscopy; Linewidth broadening; Luminescence spectral analysis; Nonradiative energy transfer; Resonance interaction; Uranyl luminescence

Document Type: Research Article


Affiliations: Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003

Publication date: September 1, 1992

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