Excited state reactions of some aromatic carbonyl compounds

Aromatic compounds;

Ireland, John Frame ; Wyatt, P. A. H. (Peter Arthur Harris) ; Wyatt, P. A. H. (Peter Arthur Harris)

University:University of St Andrews

Department:Chemistry (School of)

关键词: Aromatic compounds;   

Others  :  https://research-repository.st-andrews.ac.uk/bitstream/handle/10023/15151/JohnIrelandPhDThesis.pdf?sequence=2&isAllowed=y

来源: DR-NTU

【 摘 要 】

The pK values for xanthone protonation in the S₀, S₁ and T₁ states have been determined by direct measurement and by Forster Cycle calculation. Both methods for determining pK give the order for xanthone of pK(T₁) > pK(S₁) > pK(S₀). A study of benzophenones and acetophenones showed this pK order to be a common one for aromatic carbonyl compounds. The pK order for these compounds has been explained in terms of the type of transitions involved and the S₁-T₁ splitting of these transitions. In the case of substituted aromatic carbonyl compounds the pK order reflects the effect of substitution on the lowest S₀-S₁ and transitions. Results are also presented on the effect of inorganic anions solvenli and temperature on xanthone fluorescence. Spectral details are reported for several xanthones, benzophenones, acetophenones, and anthraquinones.