Liu Shuai, Hu Cun, Wei Ying, Duan Ming, Chen Xin, Hu Yue
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China.
Beijing National Laboratory for Molecular Sciences, Institution College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Polymers (Basel). 2018 May 3;10(5):494. doi: 10.3390/polym10050494.
Tetrakis (4-carboxyphenyl) porphyrin (TCPP) and polyelectrolyte poly(-methyl-2-vinylpyridinium iodide)--poly(ethylene oxide) (PMVP--PEO) can self-aggregate into polyion complex (PIC) micelles in alkaline aqueous solution. UV-vis spectroscopy, fluorescence spectroscopy, transmission electron microscope, and dynamic light scattering were carried out to study PIC micelles. Density functional theory (DFT) calculation method was applied to study the interaction of TCPP and PMVP--PEO. We found that the H-aggregates and J-dimers of anionic TCPP transformed in PIC micelles. H-aggregates of TCPP formed at the charge ratio of TCPP/PMVP--PEO 1:2 and J-dimer species at the charge ratio above 1:4, respectively. It is worth noting that the transformation from H-aggregates to J-dimer species of TCPP occurred just by adjusting the ratio of polymer and TCPP rather than by changing other factors such as pH, temperature, and ions.
四（4-羧基苯基）卟啉（TCPP）和聚电解质聚（甲基-2-乙烯基碘化吡啶）-聚（环氧乙烷）（PMVP-PEO）在碱性水溶液中可自聚集形成聚离子复合物（PIC）胶束。采用紫外-可见光谱、荧光光谱、透射电子显微镜和动态光散射等手段对PIC胶束进行了研究。应用密度泛函理论（DFT）计算方法研究了TCPP与PMVP-PEO的相互作用。我们发现，在PIC胶束中，阴离子型TCPP的H-聚集体和J-二聚体发生了转变。TCPP的H-聚集体分别在TCPP/PMVP-PEO电荷比为1:2时形成，而J-二聚体物种在电荷比高于1:4时形成。值得注意的是，TCPP从H-聚集体到J-二聚体物种的转变仅通过调整聚合物与TCPP的比例即可实现，而无需改变其他因素，如pH值、温度和离子。
