New reagents for determination of the quantum efficiency of singlet oxygen generation in aqueous media

Water-soluble anthracene derivatives containing carboxy, dihydroxyphosphinyl, or pyridinium fragments bound via methylene groups to 9- and 10-carbon atoms were prepared, and their spectra, solubility, and reactivity toward singlet oxygen were studied. Using sodium alpha,alpha '-(anthracene-9,10-diyl)bis(methylmalonate) as acceptor, it is possible to determine the quantum efficiency of singlet oxygen generation in aqueous solutions and in microheterogeneous media in the presence of biomacromolecules.