物理化学学报2017，Vol.33Issue(11)：2268-2276,9.DOI:10.3866/PKU.WHXB201705252
苯/二联苯为桥的噻吩-吡咯-噻吩结构:分子构型及电致变色性质
Dithenylpyrrole Structure Bridged with Phenyl or Biphenyl Rings: Molecular Configuration and Electrochromic Properties
摘要
Abstract
A series of multi-branched dithienylpyrrole (SNS) monomers with rigid phenyl (PhSNS) and biphenyl rings (BPhSNS) as bridges were designed and synthesized,and were fabricated to form cross-linked polymers (pPhSNS,pBPhSNS) by electrochemical polymerization.Cyclic voltammetry (CV) results showed that PhSNS and BPhSNS exhibited similar oxidative properties except for one new higher-potential oxidative peak appearing in the curves of PhSNS.Theoretical calculations indicated that it should be attributed to the different steric configuration between the two dithienylpyrrole (SNS) units in PhSNS.One SNS unit possessed a larger twist angle (40.2°) between thiophene and pyrrole rings than the other one (21.2°),which indicated that PhSNS possessed a relatively larger energy gap (～0.4 eV) between HOMO-1 and HOMO than BPhSNS,for which HOMO and HOMO-1 levels were of almost the same energy.However,both PhSNS and BPhSNS showed similar onset oxidation potentials.The CV curves of pPhSNS and pBPhSNS showed that they presented similar oxidative properties,which enabled their corresponding electrochemical polymers to exhibit similar electrochromic properties.The UV-vis spectra of the corresponding polymers showed that both pPhSNS and pBPhSNS possessed similar optical absorption and similar multicolor switching between yellow (-0.8 V),greyish-green (0.9 V) and gray (1.1 V) colors.Besides,pPhSNS and pBPhSNS showed fast switching times of 0.57 s and 0.93 s at 1100 nm,respectively and reasonable contrasts of 46％ and 31％ at 1100 nm,respectively.These investigations may help understand the relationship between structural configuration and the electrochemistry/electrochromic properties for polymer electrochromic (PEC) materials research.关键词
噻吩-吡咯-噻吩/分子构型/理论分析/电化学聚合/电致变色Key words
Dithienylpyrrole/Molecular configuration/Theoretical calculation/Electorpolymerization/Electrochromic分类
化学化工引用本文复制引用
戴玉玉,李维军,闫拴马,王士昭,俞越,欧阳密,陈丽涛,张诚..苯/二联苯为桥的噻吩-吡咯-噻吩结构:分子构型及电致变色性质[J].物理化学学报,2017,33(11):2268-2276,9.基金项目
The project was supported by the National Natural Science Foundation of China (51603185,51673174,51573165,51273179),Zhejiang Provincial Natural Science Foundation,China (LY17E030001,LY15E030006,LY12B03008),and Special Fund for Scientific Research from Zhejiang University of Technology,China (3817101101T).国家自然科学基金(51603185,51673174,51573165,51273179),浙江省自然科学基金(LY17E030001,LY15E030006,LY12B03008)及浙江工业大学科研专项基金(3817101101T)资助项目 （51603185,51673174,51573165,51273179）
