卟啉化合物太赫兹光谱特性研究

用化学方法合成了四苯基卟啉（TPP）、四苯基卟啉乙酸合锰（TPPMn）、四对羟基苯基卟啉（THPP）,并用太赫兹时域光谱技术研究了室温条件下这三种化合物的光谱特征,得到了各自的时域谱和透射谱。结果表明不同的卟啉化合物在太赫兹波段有不同的吸收,四苯基卟啉与四苯基卟啉乙酸合锰透射峰的位置相同,可能由于金属原予在大分子环内部配位,对分子的振动模式无影响,只是增强了物质对THz的吸收。通过比较样品的透射谱,讨论了卟啉分子结构与THz光谱吸收的关系。     

Different J-Type Aggregates of meso-Tetrakis （4-hydroxyphenyl） porphyrin （H2THPP） Formed in Different Solvents

The aggregation of meso-tetrakis(4-hydroxyphenyl)porphyrin (H2THPP) in dimethylformamide (DMF)-water solution and in DMF-chloroform solution was studied by UV-vis absorption spectroscopy. The red shift of Soret band indicates the formation of J-type aggregates of H2THPP in these two solutions. However, different shift extent of Sorer band, 12 nm in DMF-water solution and 32 nm in DMF-chloroform solution, implies structural difference between these two J-type aggregates. The hydrogen bond between hydroxyl group and N-H bonds in porphyrin ring is thought as the main cause to the formation of J-type aggregate in DMF-chloroform solution, whereas the π-Q interaction between two adjacent porphyrin cores is thought as the main cause of the formation of J-type aggregate in DMF-water solution     

Construction of J-and H-Aggregates of meso-Tetrakis （4-hydroxyphenyl） porphyrin Diacid （H4THPP^2＋）

UV-Vis spectrum was utilized to study the aggregation behaviors of H4THPP^2 in DMF-chloroform mixture and water. It was found that J-aggregation of H4THPP^2 was formed in DMF-chloroform mixture and H-aggregate was formed in aqueous solution with high ionic-strength, as indicated by different spectral characteristics of different H4THPP^2 aggregates.