Spectroscopic Studies on the Intramolecular Hydrogen Abstraction Reaction of n-Alkyl Anthraquinone-2-carboxylates

Article abstract of DOI:10.1246/bcsj.61.3121

Chain lenghts dependence of the intramolecular hydrogen abstraction reaction of n-alkyl anthraquinone-2-carboxylates (AQ-n, n=2-20) has been studied by steady-state photolysis, phophorescence, laser flash photolysis, and two-step laser induced fluorescence spectroscopies.All the results indicate that the excited triplet of the anthraquinone chromophore abstracts a hydrogen atom from its methylene side chain, whose rate increases with increasing chain lenght.The rate constant of AQ-8 is 1E4 s^-1 and the increase in the rate is about 1.5E4 s^-1 per one additional methylene unit for n>/=10.