A rhodamine-based dual chemosensor for the visual detection of copper and the ratiometric fluorescent detection of vanadium

Article abstract of DOI:10.1016/j.dyepig.2009.11.007

The optical properties of a novel, rhodamine-based derivative, synthesized by reacting rhodamine hydrazide and 5-chlorosalicylaldehyde in ethanol, were investigated in methanol:HEPES solution. The novel sensor displayed selectivity for Cu²⁺, as evidenced by a colourless to dark red colour change, which was characterized using UV-visible spectroscopy and which also allowed visual detection of Cu²⁺. In contrast, selectivity towards VO²⁺ was determined from changes in the emission spectra in the nanomolar range. This represents the first reported rhodamine-based sensor capable of detecting both Cu²⁺ and VO²⁺ using two different modes. Crown Copyright