Lu Han, Yu-Mei Zhang, Jing Kang
Nov 1, 2011
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Journal
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
Abstract
In this paper, three kinds of imidazole derivatives, 2-(4-methylphenyl)-4,5-di(2-furyl) imidazole (MDFI), 2-(4-nitrophenyl)-4,5-di(2-furyl) imidazole (NDFI), and 2-(4-tert-butylphenyl)-4,5-di(2-furyl) imidazole (t-BDFI) were synthesized. In an alkaline medium, the chemiluminescence (CL) reaction of imidazole derivatives with H(2)O(2) has been investigated. It was also found that MDFI/H(2)O(2) and t-BDFI/H(2)O(2) systems gave strong CL. When Co(2+) was added into the two CL systems, the CL intensity was remarkably enhanced. In the optimum conditions, the CL intensity is linearly related to the logarithm of concentration of Co(2+). The linear ranges are 5×10(-9)-2.5×10(-7) mol/L for MDFI/H(2)O(2) system and 5×10(-9)-2.5×10(-7) mol/L for t-BDFI/H(2)O(2) system, and the corresponding detection limits are 1.2×10(-9) mol/L and 1.1×10(-9) mol/L, respectively. The method was applied to the determination of Co(2+) in vitamin B(12) injection. Furthermore, the CL mechanism was also discussed.