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Reaction of trans-dichloro-bis[N(1)-methyl-2-(arylazo)imidazole] ruthenium(II) with tertiary phosphines

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Abstract

Trans-dichloro-bis[N(1)-methyl-2-(arylazo)imidazol e] ruthenium(II) (tcc-Ru(MeL)2Cl2) reacts with tertiary phosphines giving rise to species of type [RuCl(P)-(MeL)2]+ and [Ru(P-P)(MeL)2]2+ in which Cl, P and P-P respectively occupy cis-positions [P=PPh3, or PPh2Me; P-P=Ph2P(CH2)2PPh2 (dppe) or Ph2P (CH2)3PPh2 (dppp)]. The cations have been isolated as perchlorates. The complexes display allowed t2(Ru) → π*(MeL) transitions in the visible region and show the energy ordering [RuCl(P)(MeL)2]+<[Ru(P-P) (MeL)2]2+. The RuIII/II couple occurs at high potentials, >1.1 V versus s.c.e. The azo reduction is sensitive to the nature of substituents in the ligand. The 1H n.m.r. spectra of the complexes are compatible with the isomer of C1-symmetry.

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Authors and Affiliations

  1. Department of Chemistry, The University of Burdwan, Burdwan, 713104, India

    Tarun Kumar Misra & Chittaranjan Sinha

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  1. Tarun Kumar Misra
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  2. Chittaranjan Sinha
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Misra, T.K., Sinha, C. Reaction of trans-dichloro-bis[N(1)-methyl-2-(arylazo)imidazole] ruthenium(II) with tertiary phosphines. Transition Metal Chemistry 24, 168–171 (1999). https://doi.org/10.1023/A:1006915829814

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