کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1302600 | 974702 | 2007 | 4 صفحه PDF | دانلود رایگان |
Chelating EDTA-based bichromophores, 1,4-bis(methylenecarboxy)-1,4-bis(N-1-naphthylmethylacetamide)-1,4- diazabutane (1) and its 2-napthyl isomer (2), were synthesized, and their fluorescence emission and complexation with Cd2+ and Zn2+ were studied. The fluorescence spectrum of 2 exhibited an emission band due to intramolecular excimer at about 400 nm in addition to a band from a monomeric (or isolated) chromophore at 335 nm. Complexation with Cd2+ sensitively intensified the excimer band and weakened the monomer band, as a result of formation of a [CdL2]2− type complex. In contrast, Zn2+ formed [ZnL]0, leading to depression of the excimer emission and enhancement of the monomer emission. The extent of the changes in emission intensities in the Cd2+ complex was larger than that of the Zn2+ complex contrary to the common metal-ion effect on fluorescence. Such a characteristic emission property was not observed for isomer 1. Ligand 2 has the high Cd-sensing capability that originates from monomer–excimer interconversion.
Chelating EDTA-based bichromophore, 1,4-bis(methylenecarboxy)-1,4-bis(N-2-naphthylmethylacetamide)-1,4- diazabutane, exhibited an emission band due to intramolecular excimer at about 400 nm in addition to a band from a monomeric chromophore at 335 nm. Complexation with Cd2+ sensitively intensified the excimer band and weakened the monomer band, as a result of formation of a [CdL2]2− type complex; Zn2+ formed [ZnL]0, leading to depression of the excimer emission and enhancement of the monomer emission. The new ligand has the high Cd-sensing capability that originates from monomer–excimer interconversion.Figure optionsDownload as PowerPoint slide
Journal: Inorganic Chemistry Communications - Volume 10, Issue 5, May 2007, Pages 547–550