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- W1984809750 abstract "The behaviour of the naphthoquinone derivatives 4-(4-dimethylamino-phenyl)-[1,2]naphthoquinone (L1) and 4-[4-(1,4,7,10,13-pentaoxa-16-aza-cyclooctadec-16-il)-phenyl]-[1,2]naphthoquinone (L2) as chromogenic chemosensors of metal cations and anions in acetonitrile has been studied. L1 and L2 are highly coloured receptors with a broad band centred at 534 (log ε = 3.80) and 532 nm (log ε = 3.86), respectively, and attributed to an intra-ligand charge transfer band involving the amine and the carbonyl groups. L1 shows a hypsochromic shift of the absorption band in the visible zone in presence of Cu2+, Fe3+ and Hg2+. Additionally, L2 suffers bleaching induced by the metal cations Pb2+ and Ba2+. In both cases, the data suggested metal cation coordination through the nitrogen atom of the aniline group. 1H NMR studies in the presence of certain metals are also in agreement with this interpretation. log K for the formation of the corresponding [M(L)]2+ complexes have been determined from nonlinear least-squares treatment of the titration profiles. Studies in the presence of anions were also carried out. In acetonitrile a chromogenic sensing of the anions HSO4- was observed using the metal complex Ba–L2." @default.
- W1984809750 created "2016-06-24" @default.
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- W1984809750 date "2006-05-01" @default.
- W1984809750 modified "2023-10-15" @default.
- W1984809750 title "Naphthoquinone derivatives as receptors for the chromogenic sensing of metal cations and anions" @default.
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- W1984809750 doi "https://doi.org/10.1016/j.poly.2005.10.034" @default.
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