Aggregate of alkoxy-bridged Re(I)-rectangles as a probe for photoluminescence quenching

P. Thanasekaran, Jing Yun Wu, Bala Manimaran, T. Rajendran, I. Jy Chang, S. Rajagopal, Gene Hsiang Lee, Shie Ming Peng, Kuang Lieh Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


Alkoxy-bridged rhenium(I) rectangles [{(CO)3Re(μ-OR) 2Re(CO)3}2(μ-bpy)2] (1, R = C 4H9; 2,R = C8H17; 3, R = C 12H25; bpy = 4,4′-bipyridine) comprising long alkyl chains form optically transparent aggregates and exhibit luminescence enhancement in the presence of water. The aggregation of Re(I)-rectangle was followed using a light-scattering technique. Presumably, the enhanced luminescence efficiency resulted from restriction of 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 (quiñones) was efficient. These results indicate that the excited state of aggregated Re(I) surfactants with an electron acceptor and donor 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 optoelectronic applications.

Original languageEnglish
Pages (from-to)10953-10960
Number of pages8
JournalJournal of Physical Chemistry A
Issue number43
Publication statusPublished - 2007 Nov 1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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