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采用水溶性光敏剂——对苯甲酰苄基磺酸钠(BP~-)和对苯甲酰苄基三乙基溴化铵(BP~+)同二苯酮(BP)进行了对比研究。瞬态和稳态光谱的结果表明:BP~+,BP~-分别处于十二烷基磺酸钠(SDS)阴离子胶束和十六烷基三甲基溴化铵(CTAB)阳离子胶束的Stern层,它们在匀相和非匀相体系中的光物理和光化学性质与BP相同。测定了它们在不同离子型胶束体系中的光还原反应速度,结果表明,离子型二苯酮BP~+和BP~-比中性的BP具有更高的反应活性,它们在不同离子型胶束体系中,由于静电相互作用,光还原速度显著不同,在合适的条件下,离子型Bp~+和BP~-在胶束中的光还原速度比中性BP高几十倍以上。另外对胺的疏水性的影响也进行了考察。
A comparative study of water-soluble photosensitizers - sodium benzoylbenzyl sulfonate (BP ~ -) and p-benzoylbenzyltriethylammonium bromide (BP ~ +) with benzophenone (BP) . The results of transient and steady state spectroscopy show that BP ~ + and BP ~ - are at the positions of sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) cationic micelles, respectively Stern layers, which have the same photophysical and photochemical properties as BP in both homogeneous and non-homogeneous systems. Their photoreduction rates were measured in different ionic micelles. The results showed that the ionic benzophenones BP ~ + and BP ~ - have higher reactivity than the neutral BP, In the beam system, the photoreduction rates are significantly different due to the electrostatic interaction. Under suitable conditions, the photon reduction rates of ionic Bp ~ + and BP ~ - in micelles are several tens of times higher than that of neutral BP. The effect of the hydrophobicity of the amine was also examined.