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

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78 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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