Assembly of a Tetrathiafulvalene–Anthracene Dyad on the Surfaces of Gold Nanoparticles: Tuning the Excited-State Properties of the Anthracene Unit in the Dyad

✍ Scribed by Guanxin Zhang; Deqing Zhang; Xiaohui Zhao; Xicheng Ai; Jianping Zhang; Daoben Zhu

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 203 KB
• Volume: 12
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.200500524

✦ Synopsis

Abstract

Due to the unique features of the tetrathiafulvalene (TTF) unit, such as the electron‐donating ability and presence of methylthio groups, dyad 1 can be assembled on the surfaces of gold nanoparticles, as indicated by absorption, electrochemical, and fluorescent‐spectral studies. Dyad 1 can also be disassembled by the addition of thiols. Assembly of dyad 1 on the surfaces of gold nanoparticles leads to the formation of a triad (A~1~‐D‐A~2~), which in turn modulates the photoinduced electron‐transfer process within dyad 1. Accordingly, the fluorescence intensity of dyad 1, after assembly with gold nanoparticles, increases, and the fluorescence lifetime is prolonged. Furthermore, the assembly of dyad 1 on gold nanoparticles facilitates photodimerization of the anthracene units of dyad 1. Both fluorescence and photodimerization are associated with the excited‐state behavior of the anthracene unit, thus it may be concluded that the excited‐state properties of the anthracene unit can be tuned upon complexation with gold nanoparticles.