Arabahmadi R. A selective chemosensor and fluorescence probe for relay recognition of cations and fluoride ions in aqueous media with logic gate function.
Talanta 2018;
194:119-126. [PMID:
30609510 DOI:
10.1016/j.talanta.2018.10.015]
[Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/03/2018] [Accepted: 10/05/2018] [Indexed: 10/28/2022]
Abstract
Cation to anion relay recognition was studied for the first time with sequential specificity (Cu2+ → F- or Co2+ → F-) using a fluorescence "ON-OFF-ON" mechanism. L1 is a receptor with high selectivity for F-, Cu2+ and Co2+ ions in the solution of DMSO/H2O with a 9:1 vol ratio. Absorption and fluorescence spectra were used to investigate the sensing process. Fluorescent emission intensity of L1 at 324 is quenched (switch-Off) after the addition of Cu2+ and Co2+. Surprisingly, complex L1 + Cu2+ or L1 + Co2+ is restored with addition of F- into the compound (switch-On). Consequently, implication (from emission) and inhibit (from absorption) logic gates are constructed at molecular level. The gates operate in fluorescence and absorption modes when Cu2+ and F- or Co2+ and F- are used as input materials and the fluorescence intensity signal as outputs. Based on reversible and reproducible system, a sequential memory unit with integrated ''Writing-Reading-Erasing-Reading'' behavior, is developed.
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