Covalently Linked Acceptor−Donor Systems Based on Isoquinoline <i>N</i>-oxide Acceptor: Photoinduced Electron Transfer Produces Dual-Channel Luminescent Systems that Evolve Chemically to Photohydroxylation of the Aromatic Donor
charge-transfer (CT) state. Measurements of the corresponding electronic emission spectra revealed that these bichromophoric systems exhibit a dual fluorescence that is strongly dependent on the protonation of the N-oxide function and the donor ability. The CT state responsible for the red-shifted luminescence in the studied compounds is directly connected with the initial excitedstate S(1). On the basis
Regioselective hydroxylation of phenols by simultaneous photochemical generation of phenol cation-radical and hydroxyl radical
作者:Daniel Collado、Ezequiel Perez-Inestrosa、Rafael Suau、Juan T. Lopez Navarrete
DOI:10.1016/j.tet.2006.01.003
日期:2006.3
Substituted phenols having pendant isoquinoline N-oxide were synthesized and their photochemical and luminiscent properties studied. Photolysis in an acid medium was found to yield the related photohydroxylation products, in a regioselective process, in addition to the isoquinoline deoxygenated precursor. Photoinduced electron transfer from the donor phenols to the protonated form of the first excited