Photoelectrochemical Response of Langmuir–Blodgett Monolayer Films Containing Donor-π-Acceptor Azomethine Dyes

✍ Scribed by Fu-You Li; Jie Zheng; Lin-Pei Jin; Chun-Hui Huang; Zhong-Sheng Wang; Jian-Quan Guo

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 97 KB
• Volume: 231
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2000.7122

✦ Synopsis

Three amphiphilic azomethine dyes, (E)-N-octadecyl-2-[2-(4-N,N-dimethylaminophenyl)azomethinyl]quinolinium iodide, (E)-N-octadecyl-4-[2-(4-N,N-dimethylaminophenyl)azomethinyl]quin-

and

phenyl)azomethinyl]quinolinium iodide, have been prepared by changing different relative positions of electron-accepting groups. They were successfully transferred onto indium-tin oxide slides by the Langmiur-Blodgett (LB) technique. Photoelectrochemical studies on these dyes' LB monolayer-modified ITO electrode were carried out. In 0.5 M KI solution containing 0.05 M I 2 , the photocurrent generation quantum yield for these dyes varied from 7.2 to 15.9%, depending on the linking positions. Dependence of the photocurrent on the applied potential and the redox couple suggests that they undergo the photoinduced electron transfer mechanism of photoelectric conversion.