四-(4-苯基磺酸基)卟啉在反相微乳内相中的聚集行为

本文系统研究了四-(4-苯基磺酸基)卟啉(TPPS)在由聚乙二醇辛基苯基醚（TX-100）构筑的反相微乳液内相中的聚集行为。通过改变反相微乳水相液滴的pH值、粒径及TPPS的浓度，发现在反相乳液内相中TPPS的表观pKa明显小于在水溶液中的pKa（4.9），并且，TPPS的表观pKa随着水相液滴粒径的减小而降低；当水相液滴的pH > pKa时，TPPS以去质子化单体H2TPPS4-形式存在，而当pH < pKa时，TPPS以质子化单体H4TPPS2-和J-聚集两种形式存在，并且TPPS浓度的增大，促进了H4TPPS2-向J-聚集转变；在pH值不变的条件下，随着水相液滴粒径的增大，TPPS的存在状态由H2TPPS4-向H4TPPS2-转变，并形成J-聚集。

Aggregation Behavior of Tetrakis(4-sulfonatophenyl)porphyrin in the Inner Water Pool of Inverse Microemulsions

TX-100/n-hexanol/water/cyclohexane inverse microemulsions were used to entrap tetrakis-(4-sulfonatophenyl)porphyrin(TPPS).The aggregation behavior of TPPS in the inner phase of nonionic W/O inverse phase was investigated on changing pH,the size of the microemulsionsw0=n(H2O)/n(TX-100)] and the concentration of porphyrin.The apparent pKa of TPPS in a microemulsion was found to be much lower than that in an open aqueous solution,and exhibited a decrease on decreasing the w0 value.Deprotonized TPPS was preval...