کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1384650 | 982412 | 2010 | 5 صفحه PDF | دانلود رایگان |
For the efficient detection of toxic trace metal ions, two pyrenyl-appended triazole-based d-ribose fluorescent chemosensors 6 and 7 were prepared and their fluoroionophoric properties toward transition metal ions were investigated. Chemosensors 6 and 7 exhibit highly selective recognition toward Hg2+ ion among a series of tested metal ions in CH2Cl2/MeOH solution. The association constants of 6 and 7 are calculated to be 1.73 × 105 M−1 and 4.44 × 105 M−1, respectively. Both 6 and 7 formed complexes with the Hg2+ ion at a 1:1 ligand-to-metal ratio with a detection limit of 10–15 μM Hg2+. Computational analysis demonstrated that the Hg2+ ion occupied the coordination center of 6 with N2 and N3 atoms in two triazole groups, thus separating and distorting the two parallel pyrenes away from each other.
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Journal: Carbohydrate Research - Volume 345, Issue 17, 22 November 2010, Pages 2557–2561