Design and evaluation of highly sensitive luminescent terbium sensor for hypochlorite in water |
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| Authors: | Qianming Wang Zhan Zhou |
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| Institution: | (1) School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People’s Republic of China;(2) State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, People’s Republic of China |
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| Abstract: | A novel terbium 2-methyl-benzoimidazole-5-carboxylic acid complex was prepared and incorporated into silica matrix (tetraethoxysilane)
using a mild sol–gel technique. We then successfully fabricated a terbium luminescent xerogel, which maintained intense green
emission even in pure water. The emission was rapidly (~1 s) quenched by ClO− (detection limit 10−5 M) but not NO3
−, CH3COO−, F−, Cl−, Br−, I−, CO3
−, and OH−. The selectivity appears to be due to the high vibrational energy of ClO− as well as its strong oxidation capability. |
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