Porphyrin-based multi-signal chemosensors for Pb2+ and Cu2+†
Abstract
Two metal-free tetra(aryl)porphyrin derivatives modified by one and four N,N-bis(2-pyridylmethyl)amino group(s), namely porphyrin-1-DPA (1) and porphyrin-4-DPA (2) respectively, have been designed, synthesized, and characterized. Binding with Pb2+ induces a significant change in their solution color and in the ratio of two absorption/fluorescence signal peaks, rendering them the first example of