Synthesis and properties of electrochemiluminescent dinuclear Ru(II) complexes assembled with ester-bridged bis(bipyridine) ligands

Eun Hwa Kim, Subong Hong, Joong Min Lee, Do Nam Lee, Young Moo Jun, Won Yong Lee, Byeong Hyo Kim

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Abstract

New bridging ligands, such as bpy-(COOCH2)-bpy (BL1), mbpy-(CH2)3COOCH2-bpy (BL2), bpy-COO(CH2)6OOC-bpy (BL3), and bpy-COOCH2PhPhCH2OOC-bpy (BL4), have been synthesized and coordinated to [RuL2(acetone)2](PF6)2 for various [Ru(L)2(BL)Ru(L)2](PF6)4-type dinuclear ruthenium complexes (where BL = BL1, BL2, BL3, BL4, and L = bpy, o-phen, DTDP). Their electrochemical redox potentials, spectroscopic properties and relative electrochemiluminescence were investigated in detail. All dinuclear Ru complexes exhibit MLCT (metal-to-ligand charge transfer) absorption and luminescence bands in the visible region. ECL intensities of dinuclear ruthenium(II) complexes were affected not only by the kind of the ligand, but also by the nature of the bridging ligand. Among the synthesized dinuclear Ru complexes, [(DTDP)2Ru(mbpy)-(CH2)3COOCH2-(bpy)Ru(DTDP)2](PF6)4 exhibited enhanced ECL intensities as high as 2.9 times greater than that of the reference, [Ru(o-phen)3](PF6)2.

Original languageEnglish
Pages (from-to)1577-1584
Number of pages8
JournalInorganica Chimica Acta
Volume362
Issue number5
DOIs
Publication statusPublished - 2009 Apr 1

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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