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Synthesis and characterization of ruthenium complexes immobilized on poly(4-vinylpyridine)

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Abstract

The [Ru(NH3)5(H2O)]2+ andtrans-[Ru(NH3)4SO2(H2O)]2+ complexes ions were immobilized on poly(4-vinylpyridine) (4-PVP) through reactions in aqueous solutions. The stability of the imobilized complexes was checked in aqueous solution in the pH 2.0–8.0 range. The number of pyridinic nitrogens in the polymer 4-PVP is 2.80±0.05 mmol/g according to nitrogen elemental analysis. Potentiometric titration experiments showed that the accessible nitrogen, in aqueous medium, was 0.94±0.02 mmol/g with a pK a value of 7.4±0.2. In addition, ruthenium and sulfate analysis has demonstrated that about 15% of the accessible nitrogen sites are able to coordinate to the metal centers. The characterization of the immobilized complexes was made through diffuse electronic and infrared spectroscopies and differential pulse and cyclic voltammetries.

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Correspondence to D. W. Franco.

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Hoffmann, M.T., Lima Neto, B.S., Massabni, A.M.G. et al. Synthesis and characterization of ruthenium complexes immobilized on poly(4-vinylpyridine). J Inorg Organomet Polym 3, 155–168 (1993). https://doi.org/10.1007/BF00683793

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Key words

  • Ruthenium
  • metallopolymer
  • synthesis