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Synthesis and characterization of some new mononuclear ruthenium complexes containing 4-(un) substituted dipyridylpyrazole ligands
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2008 (English)In: Polyhedron, ISSN 0277-5387, Vol. 27, no 4, 1168-1176 p.Article in journal (Refereed) Published
Abstract [en]

A mononuclear ruthenium complex [Ru(bpy)(2)(bpp)](PF6) (1) and its halogenated and nitro derivatives [Ru(bpy)(2)(Xbpp)](PF6) (bpy = 2,2'-bipyridine; bpp = 3,5-bis(2-pyridyl)pyrazole; X = Cl, 2; X = Br, 3; X = I, 4; X = NO2, 5) have been synthesized and characterized by H-1 NMR, C-13 NMR, HRMS, elemental analysis. Complexes 2-5 have been further confirmed by X-ray diffraction. Their UV-Vis and emission spectroscopies, electrochemical measurements and acid-base properties are described. The results presented here reveal that the introduction of Cl, Br, I and NO2 groups to the coordinated bpp(-) ligand makes the absorption and emission maxima of the parent complex 1 blue-shifted, the oxidation potential of the Ru-II/Ru-III couple increased and the pK(a) value decreased obviously. In addition, significant quenching of the emission by these groups is also observed.

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2008. Vol. 27, no 4, 1168-1176 p.
URN: urn:nbn:se:kth:diva-17516DOI: 10.1016/j.poly.2007.12.023ISI: 000255619500006ScopusID: 2-s2.0-39649086279OAI: diva2:335560
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Sun, Licheng
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Organic Chemistry
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