Synthesis and photophysical properties of polyamides containing in-chain porphyrin and [60]fullerene |
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Authors: | Haiying Zhao Chen Chen Yizhou Zhu Mingzhu Shi Jianyu Zheng |
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Affiliation: | (1) State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China;(2) College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, 010021, China; |
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Abstract: | Conjugated polyamides containing porphyrin and [60]fullerene (C60) in the main chain were prepared by a direct polycondensation of the 3′H,3″H-dicyclopropa[1, 9:16, 17] [5, 6]fullerene-C60-I h -3′,3″-dicarboxylic acid and 5,15-bis(4-aminophenyl)-10,20-bis(3,5-dialkoxyphenyl)porphyrin in the presence of triphenyl phosphite and pyridine. Gel permeation chromatography (GPC) analysis of the polyamides showed the weight-average molecular weight was about 23,626–23,736, and the temperature at 5% weight loss determined by thermogravimetric analysis (TGA) was above 216 °C. The transmission electron microscopy (TEM) images displayed the regular one-dimensional linear arrays of the polyamides with lengths exceeded 200 nm. The photoinduced electron transfer from porphyrin to C60 in the polyamides was observed in nanosecond laser-flash photolysis experiments at ambient temperature, which produced a charge-separated state (porphyrin radical cation–C60 radical anion pair) with a lifetime as long as 40 μs. The calculated ratio of k CS/k CR was found to be 2.1 × 104. They could have potential applications for photoelectronic devices, organic solar cells and so on. |
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