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Laser photolysis of ionic liquid [bmim][PF6]
Authors:ZHU Guanglai  WU Guozhong  LONG Dewu  SHA Maolin  YAO Side
Affiliation:1. Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China;2. Institute of Atomic and Molecular Physics. Anhui Normal University, Wuhu 241000, China;3. Graduate School of Chinese Academy of Sciences, Beijing 100049, China;1. Surface and Colloid Science Laboratory, Geological Studies Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata 700 108, India;2. Department of Chemistry, University of North Bengal, Darjeeling 734 013, India;1. Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, 1 Hermann-von-Helmholtz-Platz, Eggenstein-Leopoldshafen 76344, Germany;2. École polytechnique fédérale de Lausanne, EPFL STI IMX SUNMIL, MXG 031 (Bâtiment MXG) Station 12, CH-1015 Lausanne, Switzerland;3. Department of Physics, University of Durham, South Road, Durham DH1 3LE, United Kingdom;4. Institute for Resource Ecology, Helmholtz Center Dresden-Rossendorf, 400 Bautzner Landstraße, Dresden 01328, Germany;1. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui West Road, Tianjin 300387, China;2. The State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Department of Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui West Road, Tianjin 300387, China;2. Advanced Separation Processes Group, Department of Chemical Engineering, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain;1. Departamento de Física de Materiales, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040 Madrid, Spain;2. Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
Abstract:Photoinduced chemical reactions of 1-butyl-3-methylimidazolium hexafiuorophosphate ([bmim][PF6])were studied by laser photolysis at a wavelength of 266 nm. Excited triplet state 3[bmim] * was observed, radical cation [bmim] 2 * and neutral [bmim]* radical via photoionization were also formed. Energy transfer from 3[bmim] * to β-carotene was confirmed. Oxidation via one electron transfer from TMPD to 3[bmim] * was also observed and the rate constant was determined to be 1.2 × 105 L. mol-1-s-1. The reaction of [bmim][PF6] with hydrated electron (eaq)was confirmed by laser photolysis in aqueous solution.
Keywords:[bmim] [PF6]  Laser flash photolysis  Triplet state  Photoionization  ionic liquid  laser photolysis  aqueous solution  electron transfer  chemical reactions  rate constant  Oxidation  carotene  Energy  photoionization  neutral  radical  cation  triplet state
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