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Primary study on solvent effect of COCA4 by laser photolysis
Authors:CHENG Kemei  YAO Side  YUAN Lihua
Affiliation:1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China;2. Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 210008, China;3. College of Chemistry, Sichuan University, Chengdu 610064, China;1. Division of Environmental and Chemical Engineering, The Research Center of Industrial Technology, Chonbuk National University, Chonju 561-756, South Korea;2. Department of Semiconductor Science and Technology, Chonbuk National University, Chonju 561-756, South Korea;1. College of Material Science and Engineering, Sichuan University, Sichuan, Chengdu 610065, China;2. Research Center for Material Interdisciplinary Science, Chongqing University of Arts and Science, Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology, Chongqing 402168, China;1. Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China;2. College of Environmental Sciences and Engineering, Chang’an University, Xi’an, Shanxi, 710064, China;3. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, CAS, POB 2871, Beijing 100085, China
Abstract:Reaction of p-tert-oxocalix[4]arene in acetonitrile (CH3CN) by 308nm laser pulses was investigated to understand its mechanism as polymer stabilizer. Four main absorption bands were observed at 300nm, 400nm, 460nm and 540nm. The 300nm absorption was assigned to the absorption of phenoxy radical, and the 460nm and 540nm were triple state absorption. It was concluded that the relative stable phenoxy radical mediate was formed through intramolecular energy transition of carbonyl triplet after laser excitation in CH3CN. The formation mechanism of phenoxyl radical was quite different from that in cyclohexane (C6H12), which was cooperation of two-photon process and one-photon process.
Keywords:p-tert-oxocalix[4]arene  Laser photolysis  Triple state  Acetonitrile  laser photolysis  solvent effect  study  cooperation  process  formation mechanism  quite  different  cyclohexane  relative  stable  intramolecular  energy  transition  carbonyl  triplet  excitation  state  assigned  radical
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