A complex between an anionic perylene diimide derivative (PDI-GlyAsp) and cupric ion has been prepared and applied to be turn-on fluorescent probe for the detection of pyrophosphate (PPi) in 100% aqueous solution. The complex formation process and PPi detection have been studied by absorption and emission spectroscopy. It was confirmed that the introduction of cupric ion into PDI-GlyAsp solution resulted in the assembly of PDI-GlyAsp into PDI-GlyAsp/Cu(2+) aggregates, leading to the fluorescence quenching of PDI-GlyAsp. Upon addition of PPi into the above solution led to the disassembly of the aggregates due to the competitive binding of PPi with Cu(2+) in the PDI-GlyAsp/Cu(2+) complex, and a recovery of PDI-GlyAsp emission was observed. Therefore, the PDI-GlyAsp/Cu(2+) complex can be applied as a turn-on fluorescent probe for detecting PPi with high selectivity and sensitivity.
A complex of a poly(3-alkoxy-4-methylthiophene) derivative, poly(3-(4-methyl-3 0 -thienyloxy) propyltrimethylammonium) (PMTPA), and an anionic dye, 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium salt (HPTS), has been prepared and applied as a colorimetric and fluorometric probe for the detection of anionic surfactants. The formation of the PMTPA/HPTS complex and its colorimetric and fluorescent responses towards anionic surfactants have been studied by absorption and emission spectroscopy. It was confirmed that the introduction of HPTS into PMTPA aqueous solution led to the formation of a PMTPA/HPTS ion-pair complex along with a solution color change from yellow to pink. Addition of anionic surfactants into the PMTPA/HPTS aqueous solution resulted in the disassembly of the complex, and a dramatic color change along with the recovery of HPTS emission were observed. Therefore, the complex can be applied as a colorimetric and fluorescent probe for detecting anionic surfactants with high selectivity and sensitivity. Besides the advantage of visual detection, the detection limit can be extended to of the order of 10 À9 M by using fluorometry.
We report a colorimetric sensor based on the supramolecular complex between a conformation-sensitive cationic polythiophene derivative, poly(3-(4-methyl-3-thienyloxy)propyltrimethylammonium) (PMTPA) and 2-naphthalenesulfonate (NS). It could be applied to discern 19 primary amino acids by the wavelength of PMTPA/NS. The sensing performance and mechanism was investigated by spectroscopic studies such as absorption and emission spectra. This approach relies on the disassembly of PMTPA/NS aggregates induced by the amphiphilic isoindole derivatives of amino acids formed in situ. 100% confidence limits for this discrimination could be achieved by using linear discriminant analysis (LDA).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.