Aggregate of Alkoxy-Bridged Re(I)-Rectangles as a Probe for Photoluminescence Quenching
详细信息 查看全文
- 作者：P. Thanasekaran ; Jing-Yun Wu ; Bala. Manimaran ; T. Rajendran ; I-Jy Chang ; S. Rajagopal ; Gene-Hsiang Lee ; Shie-Ming Peng ; Kuang-Lieh Lu
- 刊名：Journal of Physical Chemistry A
- 出版年：2007
- 出版时间：November 1, 2007
- 年：2007
- 卷：111
- 期：43
- 页码：10953 - 10960
- 全文大小：212K
- 年卷期：v.111,no.43(November 1, 2007)
- ISSN：1520-5215
文摘
Alkoxy-bridged rhenium(I) rectangles [{(CO)3Re(-OR)2Re(CO)3}2(-bpy)2] (1, R = C4H9; 2, R = C8H17; 3,R = C12H25; bpy = 4,4'-bipyridine) comprising long alkyl chains form optically transparent aggregates andexhibit luminescence enhancement in the presence of water. The aggregation of Re(I)-rectangle was followedusing a light-scattering technique. Presumably, the enhanced luminescence efficiency resulted from restrictionof torsional molecular motion in the aggregates. In addition, the rate of bimolecular quenching of Re(I)-aggregates in the triplet excited state by various electron donors (amines) and acceptors (quinones) was efficient.These results indicate that the excited state of aggregated Re(I) surfactants with an electron acceptor anddonor facilitate the electron-transfer quenching process after they became preassociated inside the Re(I)-aggregated species. These synthesized compounds may be useful fluorescent materials in optoelectronicapplications.