Coordination of di- and triimine ligands at ruthenium(II) and ruthenium(III) centers: structural,electrochemical and radical scavenging studies |
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| Authors: | Irvin N Booysen Abimbola Adebisi Matthew P Akerman Orde Q Munro Bheki Xulu |
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| Institution: | 1. School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South AfricaBooyseni@ukzn.ac.za;3. School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa |
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| Abstract: | Herein, we explore the coordination of di- and triimine chelators at ruthenium(II) and ruthenium(III) centers. The reactions of 2,6-bis-((4-tetrahydropyranimino)methyl)pyridine (thppy), N1,N2-bis((3-chromone)methylene)benzene-1,2-diamine (chb), and tris-((1H-pyrrol-2-ylmethylene)ethane)amine (H3pym) with trans-RuIICl2(PPh3)3] afforded the diamagnetic ruthenium(II) complex cis-RuCl2(thppy)(PPh3)] (1) and the paramagnetic complexes mer-Ru2(μ-chb)Cl6(PPh3)2] (2), and Ru(pym)] (3), respectively. The complexes were characterized by IR, NMR, and UV–vis spectroscopy and molar conductivity measurements. The structures were confirmed by single crystal X-ray diffraction studies. The redox properties of the metal complexes were probed via cyclic- and squarewave voltammetry. Finally, the radical scavenging capabilities of the metal complexes towards the NO and 2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl (DPPH) radicals were investigated |
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| Keywords: | Ruthenium imine crystal structure redox properties radical scavenging activity |
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