Journal
INORGANICA CHIMICA ACTA
Volume 362, Issue 5, Pages 1577-1584Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2008.08.002
Keywords
Electrochemiluminescence; Dinuclear ruthenium complexes; Bridging ligands
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Funding
- Kwangwoon University
- Center for Bioactive Molecular Hybrids
- RRC program of Ministry of Commerce, Industry and Energy
- BK 21 program of the Ministry of Education
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New bridging ligands, such as bpy-(COOCH2)-bpy (BL1), mbpy-(CH2)(3)COOCH2-bpy (BL2), bpy-COO (CH2)(6)OOC-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)(2)Ru(mbpy)-(CH2)(3)COOCH2-(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) . (C) 2008 Elsevier B.V. All rights reserved.
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