Synthesis and characterization of some new mononuclear ruthenium complexes containing 4-(un)substituted dipyridylpyrazole ligands |
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| Authors: | Wei Zhang Jian-Hui Liu Jing-Xi Pan Ping Li Li-Cheng Sun |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology, Dalian 116012, PR China;2. KTH School of Chemical Science and Engineering, Organic Chemistry, Royal Institute of Technology (KTH), Stockholm 10044, Sweden |
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| Abstract: | 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 1H NMR, 13C 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 RuII/RuIII couple increased and the pKa value decreased obviously. In addition, significant quenching of the emission by these groups is also observed. |
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| Keywords: | Ruthenium complex Dipyridylpyrazole derivatives X-ray diffraction |
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