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Triplet state decay of xanthione (XT) and 4H-1-benzopyran-4-thione (BPT) in solid b-cyclodextrin complexes. Marek Sikorski a, b and Francis Wilkinson b a Faculty of Chemistry, University of A. Mickiewicz, 60 780 Poznan, Poland b Department of Chemistry, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK The formation of a b-CD inclusion complexes of xanthione (XT) and 4H-1-benzopyran-4-thione in the solid state has been reported. The results suggest that the solid state might be a particularly useful media for studying the photophysics of aromatic thioketones. In this paper we present results of studies concerning triplet state decay of xanthione and 4H-1-benzopyran-4-thione in solid b-cyclodextrin complexes. Time resolved spectra of phosphorescence and transient absorption spectra of XT/b-CD and BPT/b-CD solid complexes have been recorded. Complex kinetics of the decay have been often used to analyse such decays in solid systems. In contrast to the phosphorescence decay of XT/b-CD solid complex, the decay recorded at the maximum of T-T spectrum of XT/b-CD solid complex could not be fitted to the Albery model. |
