A simple fabrication of carbaldehyde based fluorescent “turn-on” probe for the selective and sole detection of Pd2+: Application as test strips
A new fluorescent “turn-on” probe (DHMC) has been designed and synthesized to selectively detect Pd2+ among other cations at physiological pH. Upon incremental addition of Pd2+ into the probe solution, a “turn-on” emission enhancement was noticed with ~69 nm red shift at 562 nm in CH3CN/H2O (4/1, v/v) solution. The limit of detection as well as binding constant values have been determined and found to be in the order of 7.4 × 10-8 M and 1.7 × 105 M-1 respectively which clearly suggests that the probe is very much efficient in detecting Pd2+ in very minute level and also the DHMC-Pd2+ complexation is stable enough too. A brilliant application of the probe has been explored which indicates that DHMC can detect Pd2+ in solid state too. DFT and TDDFT studies are carried out for the probe to do further theoretical studies.