Origins of ‘on–off’ fluorescent behavior of 8-hydroxyquinoline containing chemosensors
作者:R. Todd Bronson、Marco Montalti、Luca Prodi、Nelsi Zaccheroni、Randy D. Lamb、N. Kent Dalley、Reed M. Izatt、Jerald S. Bradshaw、Paul B. Savage
DOI:10.1016/j.tet.2004.08.062
日期:2004.11
Derivatives of 8-hydroxyquinoline were used as model compounds to probe the pathways of non-radiative relaxation of fluorophores in two fluorescent chemosensors. Results suggest that both photo-induced proton transfer and photo-induced electron transfer contribute to quenching the fluorescence of the chemosensors. Crystal structures of an 8-hydroxyquinoline-containing chemosensor complexed to various metal ions indicate that a proton shift occurs concomitant with complex formation. This proton shift precludes both photo-induced proton and electron transfer allowing fluorescence emission from chemosensor-metal ion complexes. (C) 2004 Elsevier Ltd. All rights reserved.