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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, E-ISSN 1873-3719, 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.

Place, publisher, year, edition, pages
2008. Vol. 27, no 4, 1168-1176 p.
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URN: urn:nbn:se:kth:diva-17516DOI: 10.1016/j.poly.2007.12.023ISI: 000255619500006Scopus ID: 2-s2.0-39649086279OAI: oai:DiVA.org:kth-17516DiVA: diva2:335560
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QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Sun, Licheng

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