Effects of chemical modifications on photophysics and exciton dynamics of π-conjugation attenuated and metal-chelated photoconducting polymers

被引：8

作者：

Chen, LX

Jäger, WJH

Gosztola, DJ

Niemczyk, MP

Wasielewski, MR

机构：

[1] Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA

[2] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

来源：

SYNTHETIC METALS | 2001年 / 116卷 / 1-3期

关键词：

poly(phenylene vinylene) derivatives; molecular aggregates; pi-conjugation; time-resolved fast spectroscopy; chemical synthesis; semi-empirical and model calculations;

D O I：

10.1016/S0379-6779(00)00458-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effects of two types of chemical modifications on photoconducting polymers consisting of polyphenylene vinylene (PPV) derivatives are studied by static and ultrafast transient optical spectroscopy as well as semi-empirical ZINDD calculations. The first type of modification inserts 2,2'-bipyridyl-5-vinylene (bpyV) units in the PPV backbone, and the second type involves metal-chelation with the bpy sites. Photoluminescence (PL) and exciton dynamics of polymers 1 and 2 with PV:bpyV ratios of I and 3 were examined in solution, and compared with those of the homo-polymer, poly(2,5-bis(2'-ethylhexyloxy)-1,4-phenylene vinylene) (BEH-PPV). Similar studies were carried out for several metal-chelated polymers. These results can be explained by changes in pi -conjugation throughout the polymer backbone. The attenuation in pi -conjugation by the chemical modifications transforms a conducting polymer from one-dimensional semiconductor to molecular aggregates. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：229 / 234

页数：6

共 19 条

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