title: [Ultraviolet absorption spectra of iodine, iodide ion and triiodide ion].
abstract: Ultraviolet absorption spectra of iodine I2, iodide ion I(-) and triiodide ion I3(-) 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 x 10(4) L x mol(-1) x cm(-1). Absorption spectrum of I(-) appears as two absorption peaks at 193 and 226 nm with molar absorptivities of 1.42 x 10(4) and 1.34 x 10(4) L x mol(-1) x 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 I3(-). Using saturation method, molar absorptivities of I3(-) at 288 and 350 nm were determined to be 3.52 x 10(4) and 2.32 x 10(4) L x mol(-1) x cm(-1), respectively.
authors.affiliation: College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China.
authors.forename: Yong-Ju
authors.initials: YJ
authors.lastname: Wei
authors.forename: Cui-Ge
authors.initials: CG
authors.lastname: Liu
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Mo
mesh_terms: D000042:Absorption; D000465:Algorithms; D007454:Iodides / Q000737:chemistry*; D007455:Iodine / Q000737:chemistry*; D011193:Potassium Iodide / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: D007454:Iodides; D012996:Solutions; D014867:Water; D011193:Potassium Iodide; D007455:Iodine