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以9,10-菲醌、对苯二甲醛、对氟苯甲醛、对甲氧基苯甲醛、对硝基苯甲醛及吡咯等为主要原料,设计合成了双核卟啉(P_2-PPI)。通过FT-IR光谱、~1HNMR和~(13)CNMR表征了其结构,利用UV-Vis光谱、荧光光谱测试了其光谱特征。UVVis光谱测试表明,双核卟啉(P_2-PPI)Soret带的摩尔消光系数是对应单核卟啉(P1)的2.85倍,光谱吸收范围显著变宽;在浓度测试范围内,双核卟啉(P_2-PPI)的聚集形态未改变。同浓度下,荧光光谱测试表明,双核卟啉(P_2-PPI)中菲并咪唑部分的荧光强度仅为菲并咪唑前驱体的1/3,卟啉单元的荧光强度是单体卟啉的2倍。通过循环伏安法测试并比较了P_2-PPI和P1的电化学性质,并结合光化学带隙计算了E_(LUMO)和E_(HOMO)值,分别与TiO_2和I-/I-3氧化还原电对能级匹配。
Binuclear porphyrin (P_2-PPI) was designed and synthesized with 9,10-phenanthrenequinone, terephthalaldehyde, p-fluorobenzaldehyde, p-methoxybenzaldehyde, p-nitrobenzaldehyde and pyrrole as the main raw materials. Its structure was characterized by FT-IR, ~ 1HNMR and ~ (13) CNMR. The spectral characteristics were tested by UV-Vis spectroscopy and fluorescence spectroscopy. The results of UVVis spectroscopy showed that the molar extinction coefficient of Soret band of binuclear porphyrin (P_2-PPI) was 2.85 times that of mononuclear porphyrin (P1), and the range of spectral absorption broadened significantly. In the range of concentration test, binuclear porphyrin -PPI) did not change in aggregate form. Fluorescence spectra showed that the fluorescence intensity of the phenanthrene imidazole moiety in the binuclear porphyrin (P_2-PPI) was only 1/3 of that of the phenanthrene imidazole precursor, and the fluorescence intensity of the porphyrin unit was 2 Times The electrochemical properties of P_2-PPI and P1 were tested and compared by cyclic voltammetry. The LUMO and E_ (HOMO) values were calculated in combination with the photochemical bandgap. The results were compared with those of TiO_2 and I- / I-3 redox Match the level.