摘要
研究了系列双亲卟啉 (四苯酚基卟啉 P0 及其烷氧基衍生物 P1 ,P2 ,P3)在不同微环境下的电子吸收光谱和荧光发射及荧光激发光谱 .研究发现 ,卟啉在 THF溶液中以单体形式存在 ,并且其侧链取代基对卟啉电子态的影响很小 ;然而卟啉在 CTAB胶束溶液中的光谱特性却表现出很大差异 ,由此分析了不同侧链取代基对卟啉分子聚集行为和定位性质的影响 ,初步解释了卟啉在 CTAB胶束溶液中随体系 p H值改变而发生的荧光猝灭现象 .
Electronic absorption, fluorescence emission and fluorescence excitation spectra of amphiphilic porphyrins in THF(tetrahydrofuran) solutions and CTAB(cetyltrimethylammonium bromide) micellar solutions are acquired and studied. Tetra(4 hydroxylphenyl)porphyrin (P 0) and its analogs with one (P 1), two (P 2) and three hexadecyl chains (P 3) exist as the monomers in homogeneous THF, and their similar spectral characteristics indicate that the effects of the substituted hexadecyl groups on the electronic states of porphyrins are negligible in the homogeneous phase of non polar THF solutions. While the absorption spectral characteristics of amphiphilic porphyrins in neutral CTAB micellar solutions are different in the peak positions and FWHH of the Soret bands. P 0 is proposed to be solubilized in the inner core of CTAB micelles, P 1 is probably solubilized near the interface of CTAB micelles. P 2 has a certain aggregating ability, P 3 is the easiest to aggregate according to the FWHH(41.6 nm) of the Soret band. The substituted hexadecyl chains of the amphiphilic porphyrins also affect the pH dependent fluorescence emission spectra on the relative intensity of Q bands. The fluorescences are quenched at different extents to nearly zero with increasing pH values.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第11期1713-1716,共4页
Chemical Journal of Chinese Universities
基金
霍英东基金和中国科学院化学所分子动态与稳态结构实验室开放基金
