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

• 来源期刊: 中国化学快报（英文版）
• 年，卷（期）: 2017,（1）
• 页码范围: 83-88
• 页数: 6页
• 语种: 英文

摘要

Upon anthracene-sensitizing,triplet excitation dynamics of β-carotene (β-Car) were studied in nhexane,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.