摘要
用紫外-可见吸收光谱和高效液相色谱研究了品红甲亚胺染料(MAD)的光褪色过程。结果表明:MAD本身不是产生活性氧(~1O_2·O_2^(-.)的敏化剂,而是一个良好的活性氧的受体。敏化剂亚甲基兰(MB)、孟加拉玫瑰(RB)所产生的活性氧都对MAD的褪色有贡献。用竞争动力学实验,以二苯基苯并呋喃为竞争反应的标准物质,测定了MAD与活性氧反应的总反应速率常数(k=8.50×10~7L/mol·s)和化学反应速率常数(k_R=1.49×10~7L/mol·s)。结果发现猝灭过程以物理猝灭为主。RB或MB敏化MAD光氧化实验表明。~1O_2是导致MAD光氧化褪色的主要原因。
In this paper, the photofading of magenta azomethine dye(MAD) were studied by HPLC, UV-Vis spectra. It was found that MAD was not a sensitizer but a good acceptor of active oxygen (1O2,Of-2 ). The physical and chemical quenching rate constant of MAD with active oxygen was measured by HPLC, it is found that physical quenching is the chief pathway in the quenching process (KR = 1. 49×107 L/mol·s, KQ = 7. 01×107 L/mol·s) and singlet oxygen (1O2) plays a dominant role in the photofading of MAD sensitized by Methylene Blue (MB) or Rose Bengal (RB),
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期204-208,共5页
Chemical Journal of Chinese Universities
