Synthesis and photophysical properties of neutral luminescent rhenium-based molecular rectangles

T. Rajendran, Bala Manimaran, Rong Tang Liao, Ren Jay Lin, P. Thanasekaran, Gene Hsiang Lee, Shie Ming Peng, Yen Hsiang Liu, I. Jy Chang*, S. Rajagopal, Kuang Lieh Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)


A series of neutral luminescent molecular rectangles [{Re(CO) 3(μ-bpy)Br}{Re(CO)3(μ-L)Br}]2 (1-4) having fac-Re(CO)3Br as corners and 4,4′-bipyridine (bpy) as the bridging ligand on one side and other bipyridyl ligands of varying length (L) on the other side have been synthesized and characterized. The crystal structure of 1 shows a rectangular cavity with the dimensions of 11.44 x 7.21 Å. When the cavity size is tuned from 1 to 4, a dimension of 11.4 x 20.8 Å could be achieved, as revealed by the molecular modeling. These rectangles exhibit luminescence in solution at room temperature. In particular, compound 4 containing 1,4-bis(4′-pyridylethynyl)benzene (bpeb) as bridging ligand shows the excited-state lifetime of 495 ns. Fine-tuning of the cavity size of the rectangles improves their excited-state properties. These properties facilitate the study of excited-state electron-transfer reactions with electron acceptors and donors and host-guest binding. Crystallographic information: 1·6CH3COCH3 is monoclinic, P2 1/c, with a = 12.0890(2), b = 24.2982(2), and c = 12.8721(2) Å, β = 107.923(1)°, and Z = 2.

Original languageEnglish
Pages (from-to)6388-6394
Number of pages7
JournalInorganic Chemistry
Issue number20
Publication statusPublished - 2003 Oct 6

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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