新型噻吩基取代卟啉的合成及其荧光光谱研究

Synthesis of New Thiophenylporphyrins and Characterization of Their Fluorescent Spectrum Properties

合成了两种新型噻吩基卟啉 5 ,15 二 (2 噻吩基 ) 2 ,8,12 ,18 四乙基 3,7,13,17 四甲基卟啉 7a(45 .1% )和 5 ,15 二 (2 联噻吩基 ) 2 ,8,12 ,18 四乙基 3,7,13,17 四甲基卟啉 7b (6 1.2 % ) ,并研究了它们的光谱性质 其中荧光光谱的最大发射峰都在 6 31nm处 ,量子产率分别为 4 .1% (7a)和 1.4 % (7b)

Two new porphyrins 2,8,12,18\|tetraethyl\|3, 7,13,17\|tetramethyl\|5,15\|dithiophenylporphyrin (7a) and 5,15\|dibithiophenyl\|2,8,12,18\|tetraethyl\|3,7,13,17\|tetramethyl\|porphyrin (7b) are synthesized in high yields (45.1% and 61.2% respectively) through the reaction of dipyrrolemehane and thiophenylaldehyde or bithiophenylaldehyde. At the same time the porphyrinogens of these porphyrins can also be getted in high yields (81.3% and 64.7%) from this reaction without adding oxydant. Fluorescent properties of them have been studied. Their maximum fluorescent emissions are both at 631 nm and their quantum yields are 4.1% (7a) and 1.4% (7b) respectively. Spectrums of UV\|Vis fluorescence and H 1 NMR show that with the increment of the substituents in the meso\|positions of porphyrin, the porphyrin's cyclic plane become more nonplanar.