摘要
对比研究了岩藻黄质(Fuc)在氯仿和甲醇溶液中光诱导生成自由基正离子(Fuc·+)的动力学过程,考察了2种不同溶剂中Fuc·+产生机制的差异.采用光谱电化学方法结合纳秒时间分辨吸收光谱技术,通过比较直接光激发和三重态敏化2种不同方式诱导生成Fuc·+的动力学过程发现,在氯仿溶液中Fuc·+主要源于Fuc的单重激发态(S2),在甲醇溶液中则主要源于Fuc的三重激发态(T1).
Kinetics of fucoxanthin radical cation(Fuc·+) formation in chloroform and in methanol were comparatively studied by means of nanosecond time-resolved absorption spectroscopy combined with spetroelectrochemistry.Direct photoexcitation and anthracene-sensitized triplet excitation,respectively,were used to initiate the photochemistry of different fucoxanthin solutions.It is found that in chloroform Fuc·+ is mainly formed from the singlet excited state of Fuc(S2),whereas in methanol it is mainly formed from the lowest triplet excited state of Fuc(T1).
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第12期2463-2467,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20803091,20703067)
中国人民大学科学研究基金(中央高校基本科研业务费专项资金)资助
关键词
岩藻黄质
自由基正离子
纳秒时间分辨吸收光谱
光谱电化学
Fucoxanthin
Radical cation
Nanosecond time-resolved absorption spectroscopy
Spetroelectrochemistry