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化学学报
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化学学报 ›› 1991, Vol. 49 ›› Issue (3): 303-307. 上一篇    下一篇

研究论文

二苯酮在功能胶束中的光还原反应的研究

方培基;王尔鉴   

  1. 中国科学院感光化学研究所
  • 发布日期:1991-03-15

Study on the photoreduction of benzophenone derivatives in the functional micelles

FANG PEIJI;WANG ERJIAN   

  • Published:1991-03-15

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本文研究了一种具有分子自聚集作用的二苯酮(BP)衍生物p-C6H5COC6H4CH2^+N(CH3)2C12H25.Br^-(PKT)的光还原反应及其光物理性质。连接在PKT上BP的光还原反应活性在胶束形成前后有很大差别。 反应速率随着浓度增大在形成的胶束中比均相水溶液中快1.5倍。值得指出, 在PKT功能胶束中的BP还原速率与普通胶束相比, 增加10倍以上。动力学数据测定表明, PKT胶束大大加速了BP-三乙胺(TEA)光还反应中的电子转移, 在TEA高浓度时有利于质子转移, k~d/k~r值减少,k~n/k~e值增加, 对不同TEA浓度的光还原机理亦作了讨论。

关键词: 胶束, 反应速度常数, 光还原, 二苯甲酮, 电子转移

Photoredn. of benzophenone (BP) derivatives was studied in benzoylbenzyldimethyldodecylammonium bromide (PKT: p-C6H5COC6H4CH2N+(CH3)2C12H25.Br-). The photoredn. activity of BP linked to PKT by amine (TEA) differed significantly before and after the formation of the PKT micelle, and the reaction rate enhancement with increasing concentration in the micelle formed was u1.5 times the rate in a homogeneous aqueous solution The photoredn. rate of BP gained >10-fold in PKT functional micelle than in conventional micelles. Kinetic data show that the electron transfer in the BP/TEA photoredn. is mainly promoted by PKT micelle and the proton transfer is more efficient at high amine concentration The photoredn. mechanism of BP bound to PKT under different conditions is discussed.

Key words: MICELLE, REACTION RATE CONSTANT, PHOTO REDUCTION, DIPHENYLMETHANONE

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