科研之友
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摘要
One new azacrown[N,S,O]-modified metal-free porphyrin derivative, H(2)Por-azacrown (1), with the central tetrapyrrole moiety as signaling fluorophore and/or metal ion receptor has been designed, synthesized, and characterized. Addition of Ag+ into this novel metal-free porphyrin compound induces a fluorescence ON-OFF process, while adding Pb2+ leads to absorption/emission-ratiometric signals. Quite interestingly, blue-shift of the Soret band, ratiometric change of Q bands, and dual-signal changes (absorption ratio and fluorescence ON-OFF) associated with the Cu2+ displacement from the 1-Pb2+ system were observed upon addition of Cu2+. These results render this H(2)Por-azacrown compound a porphyrin-based multi-responsive optical sensor towards Ag+, Pb2+, and in particular Cu2+ with dual-mode detecting potential.
