Rhodamine-anthraquinone based dyad for rapid and selective sensing of Al3+ with potential application for real-time sampling and molecular logic circuits

摘要

A new rhodamine-anthraquinone based "off-on-off" colorimetric and fluorimetric sensor was designed, synthesized and characterized by H-1, C-13 NMR and Mass spectrometric techniques. It was found out to be sensitive and selective towards Al(3+ )without any interference from other competitive metal ions. Dyad 1 did not display any emission but on treating with Al(3+ )fluorescence enhancement at 587 nm was observed. Dyad 1 formed a stable 1:1 complex with Al3+ ions with a binding constant of 7.07 x 10(4 )M (-1) and was able to detect Al3+ ions with lowest detection limit of 0.2 mu M. The complex 1.Al3+ was further tested for its reversibility by treating it with different anions. The emission of 1.Al3+ was quenched only in the presence of CN - ions. Based on this result, molecular logical circuits were constructed with a combination of AND, OR, NOT, NOR gates. The capability of dyad 1 to detect Al3+ in real time sample was also achieved.