Ghosh, Amrita ; Ganguly, Bishwajit ; Das, Amitava (2007) Urea-based ruthenium (II)-polypyridyl complex as an optical sensor for anions: Synthesis, characterization, and binding studies Inorganic Chemistry, 46 (23). pp. 9912-9918. ISSN 0020-1669
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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic701447g
Related URL: http://dx.doi.org/10.1021/ic701447g
Abstract
A new ruthenium(II) complex [Ru(bpy)2(1-(6-nitro-[1,10]phenanthrolin-5-yl)-3-(4-nitrophenyl)-urea)] (bpy = 2,2'-bipyridyl) was synthesized and characterized using standard analytical and spectroscopic techniques. Detailed absorption, emission, and 1H NMR spectral studies revealed that this receptor molecule acts as a sensor for F-, CH3COO-, and H2PO4- in acetonitrile solution. Binding of these anions caused an appreciable change in the color of the acetonitrile solution, which could be detected with the naked eye. At relatively lower concentration of anions, 1:1 H-bonded adduct was formed; however, at higher concentration, classical Bronsted acid-base-type reaction prevailed. The relative binding affinity of different anions toward this receptor was evaluated and was rationalized with quantum chemical calculations. Narrowing of the gap between the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels on deprotonation of the receptor molecule caused a faster decay of the luminescence lifetime for the RudΠ → LΠ*/bpyΠ*-based triplet excited state.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
ID Code: | 59940 |
Deposited On: | 08 Sep 2011 10:21 |
Last Modified: | 08 Sep 2011 10:21 |
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