Photophysical and electrochemical properties of 1,7-diaryl-substituted perylene diimides

被引:186
作者
Chao, CC
Leung, MK [1 ]
Su, YO
Chiu, KY
Lin, TH
Shieh, SJ
Lin, SC
机构
[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
[2] Natl Taiwan Univ, Inst Polymer Sci & Engn, Taipei 106, Taiwan
[3] Natl Chi Nan Univ, Dept Appl Chem, Nantou 545, Taiwan
关键词
D O I
10.1021/jo050001f
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Substituent effects on the photophysical and electrochemical properties of 1,7-diaryl-substituted perylene diimides (1,7-Ar(2)PDIs) have been carefully explored. Progressive red-shifts of the absorption and emission maxima were observed when the electron-donating ability of these substituents was increased. Linear Hammett correlations of 1/lambda(max) versus sigma(+) were observed in both spectral analyses. The positive slopes of the Hammett plots suggested that the electronic transitions carry certain amounts of photoinduced intramolecular charge-transfer (PICT) character from the aryl substituents to the perylene diimide core which leads to the reduction of the electron density on the substituents. The substituent electronic effects originated mainly from the perturbation of the core PDI HOMO energy level by the substituents. This conclusion was supported by PM3 analyses and confirmed by cyclic voltammetry experiments. More interestingly, the Ph2NC6H4-substituted PDI, 4i, showed an unusual dual-band absorption that spans from 450 to 750 nm. We tentatively assigned these two bands as the charge-transfer band and the PDI core absorption, respectively.
引用
收藏
页码:4323 / 4331
页数:9
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