Abstract:Two new D-π-A dyes were synthesized by the condensation reaction between active methyl and aromatic aldehyde and its biothiol sensing properties in DMSO/water were investigated by UV-vis spectroscopy. Upon addition of Hg 2+ , the solution of D-π-A dyes showed color change and the absorption band shows a formation of a dye-Hg 2+ coordination complex. These dyes exhibited high selectivity for Hg 2+ as compared with other cations. The dye-Hg 2+ could be recovered by adding glutathion(GSH). The absorption intensity of dye-Hg 2+ increased only by the addition of glutathione(GSH). The competition experiments revealed that no obvious interference was observed by performing the titration with the mixture of glutathione(GSH) and other amino acids.The results indicated that these D-π-A dyes were highly selective for glutathione(GSH) detection.
We obtained two conformational polymorphs of 2,5-dichloro-3,6-bis(dibenzylamino)-p-hydroquinone, CHClNO. Both polymorphs have an inversion centre at the centre of the hydroquinone ring (Z' = 1/2), and there are no significant differences between their bond lengths and angles. The most significant structural difference in the molecular conformations was found in the rotation of the phenyl rings of the two crystallographically independent benzyl groups. The crystal structures of the polymorphs were distinguishable with respect to the arrangement of the hydroquinone rings and the packing motif of the phenyl rings that form part of the benzyl groups. The phenyl groups of one polymorph are arranged in a face-to-edge motif between adjacent molecules, with intermolecular C-H...π interactions, whereas the phenyl rings in the other polymorph form a lamellar stacking pattern with no significant intermolecular interactions. We suggest that this partial conformational difference in the molecular structures leads to the significant structural differences observed in their molecular arrangements.
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