THE CHARACTERISATION OF THE TRIPLET STATE OF CROCETIN, A WATER SOLUBLE CAROTENOID, BY NANOSECOND LASER FLASH PHOTOLYSES |
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| Authors: | M Craw C Lambert |
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| Institution: | Chemistry Department, Paisley College of Technology, High Street, Paisley, PA 1 2BE, UK |
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| Abstract: | Abstract— The triplet state of crocetin, which is a water soluble carotenoid, has been sensitized by psoralen. The triplet extinction coefficient, εT (73000 dm3 mol-1 cm-1 at 470 nm), the triplet-triplet spectrum and the quantum yield of triplet formation, φT (less than 1%) are reported in aqueous solution.
In order to calculate the extinction coefficient of crocetin it was necessary to obtain εT for psoralen in water (10000dm3 mol-1 cm-1 at 450 nm). This latter value was obtained using the complete conversion technique and is reported with the triplet-triplet spectrum. |
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