Synthesis And Properties Of New Novel Fluorescent Chemosensors Based On Rhodamine Derivatives

The advantages of molecular fluorescent probes for sensing can besummarized as high sensitivity of detection down to the single molecule,“on-off”, switch ability, observation insitu, remote sensing by usingoptical fibres, et al. They have played an important role in detection ofmetal cations, mucleic acids and immune cells.The rhodamine framework is an ideal mode to construct fluorescentchemosensors. It is excellent photophysical properties such as longabsorption and emission wavelength, large absorption coefficient and highfluorescence quantum yield. And it has been widely applied in thechemistry and biology.Based on the review understand the rhodamine fluorescence chemical sensor development and their fluorescence selectivity. On the basis, aseries of receptors with rodamine B and rodamine6G dye as reportinggroup2-1²-6were synthesized and identified by1H NMR，13C NMR,and elemental analysis.The properties of probes with various ions were analysed by UV-visand fluorescence spectroscopy. The result demonstrated that the receptor2-1has high selectivity and sensitivity to Hg2+in CH3CN/H2O（1:9, v/v）.2-3and2-5can recognize Fe³⁺and Cu²⁺in aqueous solution, respectively.