화학공학소재연구정보센터
Journal of Physical Chemistry B, Vol.124, No.5, 848-860, 2020
Complementary Effect of Intra- and Intermolecular Hydrogen Bonds on Electron Transfer in beta-Hydroxy-Anthraquinone Derivatives
We have carried out an electrochemical and theoretical study on the relationship between electron transfer (ET) and hydrogen bonding in 11 different 9,10-anthraquinone (AQ) derivatives, including beta-hydroxy AQs and their methoxylated analogs, in the presence of hydrogen donors in acetonitrile (ACN). The complementary effects of the intra- and intermolecular hydrogen bonds (HBs) on ET were studied by analyzing the complex formation constants derived from the intermolecular HB. Our results revealed that the inductive effect of the beta substituent that indirectly controls the charge distribution on the AQ carbonyl oxygen, and steric hindrance at the beta position, affect the complex formation constants. Furthermore, the analysis of ET in different isomeric dihydroxy AQs suggested that the position of the hydroxy groups affects the charge distribution and stabilizes structures through conjugation of the quinone moiety including the ipso ring, controlling the intra- and intermolecular HBs complementarily.