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本文以2,2,6,6-四甲基-4-哌啶酮-1-氧基为探针,测定邻苯二酚、血卟啉衍生物(HPD)水溶液的氧消耗率和HPD阴离子自由基产率。结果发现,在HPD的原初光化学反应中,单线态氧和自由基两种机制同时并存,它们在竞争性地起作用。当溶液中的氧浓度下降到原初可浓度的12—14％时,占优势的光敏机制从单线态氧转向自由基。HPD是否以聚集态存在,对光敏机制有很大的影响。无论溶液中是否有氧,只要HPD以聚集态存在,起主导作用的都是自由基机制,而且敏化效果较好。
In this paper 2,2,6,6-tetramethyl-4-piperidone-1-oxyl as a probe, determination of catechol, hematoporphyrin derivative (HPD) aqueous solution of oxygen consumption and HPD anion Free radical yield. The results showed that singlet oxygen and free radicals co-exist in the original photochemical reaction of HPD, and they play a competitive role. When the oxygen concentration in the solution drops to 12-14% of the original concentration, the dominant photo-sensing mechanism shifts from singlet oxygen to free radicals. Whether HPD exists in aggregated state has a great influence on the photosensitive mechanism. Regardless of whether there is oxygen in the solution, as long as the HPD exists in the aggregated state, the dominant mechanism is the free radical mechanism, and the sensitization effect is better.