Luminescence quenching of Re(i) molecular rectangles by quinones

Thangamuthu Rajendran, Balasubramanian Manimaran, Rong Tang Liao, Yen Hsiang Liu, Pounraj Thanasekaran, Ren Jay Lin, I. Jy Chang, Pi Tai Chou, Ramasamy Ramaraj, Seenivasan Rajagopal*, Kuang Lieh Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The rhenium-based rectangles [{Re(CO)3(μ-bpy)Br}{Re(CO) 3(μ-L)Br}]2 (I, L = 4,4′-dipyridylacetylene (dpa); II, L = 4,4′-dipyridylbutadiyne (dpb); III, L = 1,4-bis(4′-pyridylethynyl)benzene (bpeb); bpy = 4,4′-bipyridine) are emissive in solution at room temperature. The presence of extended π conjugation leads to an increase in electron delocalization, which, in turn, results in improved luminescence and lower nuclear reorganization energy. These rectangles, upon electronic excitation, undergo facile electron transfer (ET) reactions with quinones and both the dynamic and static quenching contribute to the reaction. Spectral and electrochemical measurements show that quinone 7,7,8,8-tetracyanoquinodimethane (TCNQ) binds strongly to rectangle I. The driving force dependence of ket, deduced from the luminescence quenching of rectangles with quinones, can be well accounted for within the context of the Marcus theory of electron transfer.

Original languageEnglish
Pages (from-to)2928-2935
Number of pages8
JournalDalton Transactions
Issue number11
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Inorganic Chemistry


Dive into the research topics of 'Luminescence quenching of Re(i) molecular rectangles by quinones'. Together they form a unique fingerprint.

Cite this