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Synthesis and chara...
Synthesis and characterization of some new mononuclear ruthenium complexes containing 4-(un) substituted dipyridylpyrazole ligands
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Zhang, Wei (author)
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Liu, Jian-Hul (author)
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Pan, Jing-Xi (author)
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Li, Ping (author)
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- Sun, Licheng (author)
- KTH,Organisk kemi
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(creator_code:org_t)
- Elsevier BV, 2008
- 2008
- English.
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In: Polyhedron. - : Elsevier BV. - 0277-5387 .- 1873-3719. ; 27:4, s. 1168-1176
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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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