The synthesis, characterization of three isomers of rhodamine derivative and their application in copper (II) ion recognition

Three isomers of rhodamine derivative, ortho-pyridylaldehyde rhodamine hydrazone (1), meta-pyridylaldehyde rhodamine hydrazone (2), and para-pyridylaldehyde rhodamine hydrazone (3) were synthesized and characterized. And their recognition abilities for Cu2+ were studied. The result showed that ortho-pyridylaldehyde rhodamine hydrazone (1) is best probe for Cu2+, furthermore 1 is a colorimetric and fluorometric dual-model probe for Cu2+. It was also applied in bioimaging.