Comparative Study on the Inclusion Interaction between meso-Tetrakis(4-N-ethylpyridiniurmyl)porphyrin and β-Cyclodextrin Derivatives

The interaction of p-cyclodextrin (β-CD) and the modified cyclodextrins, hydroxy propyl-p-cyclodextrin (HP-β-CD), sulfobutylether-β-cyclodextrin (SBE-β-CD) and synthesized meso-tetrakis(4-N-ethylpyridiniurmyl)porphyrin (TEPyP) in aqueous solution has been studied by spectroscopic methods systematically. A significant change in fluorescence and absorption properties has been observed in the presence of β-CD, HP-β-CD and SBE-β-CD. The stoichiometry and formation constants have been determined by the steady-state fluorescence technique. The results showed that the β-CD derivatives were prior to the native β-CD and the hydrogen bonding and static electric forces played important roles in the formation of the inclusion complexes. The conformation was further confirmed by NMR spectroscopy.

阳离子聚合物诱导的TPPS超分子自组装行为

为研究不同阳离子聚合物对5,10,15,20-四(4-磺酸基苯基)卟啉(TPPS)在水溶液中的自组装行为的诱导作用,采用质量分数为3%的季铵化壳聚糖、聚环氧氯丙烷-胺阳离子聚合物诱导TPPS的自组装行为,并通过紫外可见(UV-vis)光谱对其进行表征。结果表明:在季铵化壳聚糖诱导下,TPPS在溶液pH低于4时自组装形成J-型聚集体,pH高于4时以去质子化单体形式存在;在聚环氧氯丙烷-胺阳离子聚合物诱导下,TPPS在溶液pH低于3时自组装形成J-型聚集体,高于3时自组装转化为H-型聚集体;无阳离子聚合物诱导时,TPPS仅在pH为1时的高酸性条件下才自组装为J-型聚集体;电中性聚合物聚乙烯醇对TPPS分子自组装无明显影响;阳离子聚合物诱导下的TPPS分子自组装不受TPPS浓度的影响。