Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2007, Vol. 18 ›› Issue (5): 272 doi: 10.1016/S1001-8042(07)60060-8

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Primary study on solvent effect of COCA4 by laser photolysis

CHENG Kemei*1 YAO Side2 YUAN Lihua3   

  1. 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
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CHENG Kemei YAO Side YUAN Lihua. Primary study on solvent effect of COCA4 by laser photolysis.Nuclear Science and Techniques, 2007, 18(5): 272     doi: 10.1016/S1001-8042(07)60060-8
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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 in-tramolecular 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.

Key words: p-tert-oxocalix[4]arene, Laser photolysis, Triple state, Acetonitrile