Proof of principle of a purine D–A–D′ ligand based ratiometric chemical sensor harnessing complexation induced intermolecular PET

摘要: A comprehensive photophysical study of a series purines, doubly decorated at C2 and C6 positions with identical fragments ranging from electron acceptor to donor groups different strengths, is presented. The asymmetry substitutions creates unique molecular D–A–D′ structure possessing two independent electronic charge transfer (CT) systems attributed each fragment exhibiting dual-band fluorescence. Moreover, the inherent property coordination metal ions by purines was enriched due presence nearby triazoles used as spacers for or fragments. New molecules present bidentate mode, which makes assembly several ligands one cation possible. This exploited create new concept ratiometric chemical fluorescence sensor involving photoinduced between branches mechanism modulation.