Synthesis And Properties Of Cation Fluorescent Chemosensors Based On Rhodamine-b/ Anthracene

The advantages of molecular fluorescent Probes for sensing can be summarized: high sensitivity of detection down to the single molecule,'on-off', switch ability, observation insitu, remote sensing by using optical fibres, et al, and already has played an important role in metal cations, mucleic acids, immune cells and testing.In this thesis, receptors bearing various metal ions binding sites chemosensors were reviewed. Their abilities to selectively bind and sense cations were detailed presented. On the basis, a series of receptors2-1~2-4,3-1 were synthesized from Rhodamine B and anthracene and identified by 1H NMR,13C NMR, and elemental analysis.The interaction between the receptors and various metal cations was studied by fluorescence and UV-vis spectrum. The results demonstrate that receptors 2-2~2-4,3-1 had an excellent selective recognition and sensitivity for Hg2+,Cu2+,Fe3+,Cu2+ respectively, moreover, 2-1 is the first chemosensor based on small molecule that can detect both Pb2+ and Hg2+ at 1nM and 10nM level, respectively.The mechanism of the receptors with cations were studied through 1H NMR and MS, and preliminarly infered the mode of action between them.