Triplet excitation dynamics of β-carotene studied in three solvents by ns flash photolysis spectroscopy

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• 作者：Ying Jia ; Ying Shi ; Peng Wang ; ^{wpeng@iccas.ac.cn} ; Jian-Ping Zhang
• 关键词：β-Carotene ; Triplet excitation dynamics ; Solvent effect ; ns Flash photolysis
• 刊名：Chinese Chemical Letters
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：1
• 页码：83-88
• 全文大小：3598 K
• 卷排序：28

文摘

Upon anthracene-sensitizing, triplet excitation dynamics of β-carotene (β-Car) were studied in n-hexane, in methanol, and in acetonitrile, respectively, by ns flash photolysis spectroscopy. In n-hexane, only the bleaching of the ground state absorption (GSB) and the excitation triplet (3Car*) absorption were observed, and there were no cationic species detected. In both methanol and acetonitrile, similar excitation dynamics were observed, i.e., 3Car* having a similar lifetime to that in n-hexane, and the immediate generation of the cation dehydrodimer (#[Car]2+) upon excitation following transformation into the radical cation Car +, since Car + has much longer lifetime in acetonitrile than in methanol. The results prove that both solvent and carotenoid structure determine the triplet excitation mechanism.