| 光谱学与光谱分析 |
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| Ultraviolet Absorption Spectra of Iodine, Iodide Ion and Triiodide Ion |
| WEI Yong-ju, LIU Cui-ge, MO Li-ping |
| College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China |
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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.
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Received: 2003-03-16
Accepted: 2003-08-08
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Corresponding Authors:
WEI Yong-ju
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| Cite this article: |
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WEI Yong-ju,LIU Cui-ge,MO Li-ping. Ultraviolet Absorption Spectra of Iodine, Iodide Ion and Triiodide Ion [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(01): 86-88.
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https://www.gpxygpfx.com/EN/Y2005/V25/I01/86 |
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