Analysis of Photochemical Reactions of Bis(1,10-phenanthroline)-diamineruthenium(II) Complexes by Electrospray Ionization Mass Spectrometry.

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  • ARAKAWA Ryuichi
    Department of Applied Chemistry, Faculty of Engineering, Kansai University
  • ABE Kazuyuki
    Department of Applied Chemistry, Faculty of Engineering, Kansai University
  • IWAI Masayoshi
    Department of Applied Chemistry, Faculty of Engineering, Kansai University
  • FUKUO Tsuyoshi
    Department of Applied Chemistry, Faculty of Engineering, Kansai University
  • NAKABAYASHI Yasuo
    Chemistry Branch, Faculty of Engineering, Kansai University

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  • Analysis of Photochemical Reactions of Bis(1,10-phenthroline)-diamineruthenium(II) Complexes by Electrospray Ionization Mass Spectrometry
  • Analysis of Photochemical Reactions of Bis (1,10-phenanthroline)-diamineruthenium (2) Complexes by Electrospray Ionization Mass Spectrometry

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The photo ligand substitution reaction of the bisphenanthroline complex [Ru(phen)2B]2+ (where phen=1,10-phenanthroline, B=ethylenediamine (en), trimethylenediamine (tn), or butanediamine (bn)) in acetonitrile solution was studied using electrospray ionization mass spectrometry (ESI-MS). The photochemical reaction of a diamineruthenium(II) complex has been known to proceed by oxidation of a diamine ligand to an α,α′-diimine by oxidative dehydrogenation. The final reaction product was a solvent substituted complex [Ru(phen)2S2]2+, where S is the solvent acetonitrile. We detected two monodentate complexes, an imine complex [Ru(phen)2(B-2)S]2+ and a nitroso complex [Ru(phen)2(en+14)S]2+ in the ESI-MS analysis of the photoreaction products of [Ru(phen)2B]2+. These monodentate complexes were not observed with a bipyridine complex [Ru(bpy)2B]2+ (where bpy=2,2′-bipyridine, B=en or tn). In addition, photochemical reactivity of the phen complex was found to be higher than that of the bpy complex. The difference in the photochemical reactivity can be explained by the difference in configurational flexibility of the phen and bpy ligands in the ruthenium complexes.

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