Condensation Product of p-anisaldehyde and L-phenylalanine: Fluorescent "on-off" Sensor for Cu and IMPLICATION Logic Gate.

(Z)-2-(4-methoxybenzylideneamino)-3-phenylpropanoic acid (L) synthesized by condensation of p-anisaldehyde and L-phenylalanine acts as selective fluorescent as well as voltammetric sensor for Cu in 2:1 (v/v) CHOH:HO. The fluorescence intensity of L (λ 425 nm) is quenched ca. 65% by Cu. Metal ions - Li, Na, K, Al, Cu, Zn, Cd, Hg, Mn, Ni and Pb do not interfere. The binding constant and the detection limits were calculated to be 0.56 × 10 M and 10 M respectively. DFT and TDDFT calculations confirmed 2:1 binding stoichiometry between L and Cu obtained from fluorescence data. The interaction between L and Cu is reversible for many cycles with respect to ethylenediamine tetraacetate anion (EDTA) which results in IMPLICATION logic gate.