In 2019,Talanta included an article by Arabahmadi, Raziyeh. Reference of 2,6-Diaminopyridine. The article was titled 《A selective chemosensor and fluorescence probe for relay recognition of cations and fluoride ions in aqueous media with logic gate function》. The information in the text is summarized as follows:
Cation to anion relay recognition was studied for the 1st time with sequential specificity (Cu2+ → F- or Co2+ → F-) using a fluorescence ON-OFF-ON mechanism. I (L1) is a receptor with high selectivity for F-, Cu2+ and Co2+ ions in the solution of DMSO/H2O with a 9:1 volume ratio. Absorption and fluorescence spectra were used to study 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 mol. level. The gates operate in fluorescence and absorption modes when Cu2+ and F- or Co2+ and F- were 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. In the experiment, the researchers used many compounds, for example, 2,6-Diaminopyridine(cas: 141-86-6Reference of 2,6-Diaminopyridine)
2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Reference of 2,6-Diaminopyridine