New application of a known molecule: Rhodamine B 8-hydroxy-2- quinolinecarboxaldehyde Schiff base as a colorimetric and fluorescent 'off-on' probe for copper (II)

摘要

Rhodamine B 8-hydroxy-2-quinolinecarboxaldehyde Schiff base (1) has been investigated as a colorimetric and fluorescent "off-on" probe for the recognition of Cu~(2+) in aqueous solution. Probe 1 was synthesized by condensation of rhodamine B hydrazide and 8-hydroxy-2-quinolinecarboxaldehyde, which exhibited good selectivity for Cu~(2+) among a range of biologically and environmentally important metal ions. The Cu~(2+) recognition event undergoes a Cu2+ promoted hydrolysis of probe 1 to release rhodamine B and the recognition process is barely interfered by other coexisting metal ions.