Abstract:Ultraviolet absorption spectra of iodine I2, iodide ion I- and triiodide ion I-3 were studied, and molar absorptivities of these species were determined. Absorption spectrum of I2 aqueous solution appears as an absorption peak at 203 nm with a molar absorptivity of 1.96×104 L·mol-1·cm-1. Absorption spectrum of I- appears as two absorption peaks at 193 and 226 nm with molar absorptivities of 1.42×104 and 1.34×104 L·mol-1·cm-1, respectively. When I2 aqueous solution is mixed with KI solution, two absorption peaks appear at 288 and 350 nm, respectively,indicating the formation of I-3. Using saturation method, molar absorptivities of I-3 at 288 and 350 nm were determined to be 3.52×104 and 2.32×104 L·mol-1·cm-1, respectively.
魏永巨,刘翠格,默丽萍. 碘、碘离子和碘三离子的紫外吸收光谱 [J]. 光谱学与光谱分析, 2005, 25(01): 86-88.
WEI Yong-ju, LIU Cui-ge, MO Li-ping . Ultraviolet Absorption Spectra of Iodine, Iodide Ion and Triiodide Ion . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(01): 86-88.
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