Reaction of an α-pyrrolidonate-bridged cis-diammineplatinum(II) dimer with molecular oxygen and its application to the catalytic O2 oxidation of hydroquinone

Ken Sakai, Taro Tsubomura, Kazuko Matsumoto

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The catalytic effect of [PtII2(NH3)4(C4H6NO)2]2+ (PtII2 dimer; C4H6NO = α-pyrrolidonate) in the O2 oxidation of hydroquinone to quinone is investigated at pH 5. Both the O2 oxidation of this dimer into [PtIII2(NH3)4(C4H6NO)2(L)2]4+ (PtIII2 dimer; L = OH2, OH-, SO42-, etc.) and the re-reduction of the PtIII2 dimer into the PtII2 dimer by hydroquinone were found to be thermodynamically favorable. With an excess of hydroquinone, the rate of the catalytic reaction exceeds that of the former reaction and is roughly linear to the hydroquinone concentration, suggesting that a certain intermediate formed in the reaction between the PtII2 dimer and O2 plays a major role in the present catalysis. In addition, hydrolysis equilibria for the axial aqua ligands on the PtIII2 dimer are investigated spectrophotometrically.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalInorganica Chimica Acta
Volume234
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1995
Externally publishedYes

Fingerprint

Molecular oxygen
Catalytic oxidation
Dimers
dimers
oxidation
oxygen
Oxidation
quinones
hydroquinone
Catalysis
catalysis
hydrolysis
Hydrolysis
Ligands
ligands

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Reaction of an α-pyrrolidonate-bridged cis-diammineplatinum(II) dimer with molecular oxygen and its application to the catalytic O2 oxidation of hydroquinone. / Sakai, Ken; Tsubomura, Taro; Matsumoto, Kazuko.

In: Inorganica Chimica Acta, Vol. 234, No. 1-2, 01.01.1995, p. 157-161.

Research output: Contribution to journalArticle

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abstract = "The catalytic effect of [PtII2(NH3)4(C4H6NO)2]2+ (PtII2 dimer; C4H6NO = α-pyrrolidonate) in the O2 oxidation of hydroquinone to quinone is investigated at pH 5. Both the O2 oxidation of this dimer into [PtIII2(NH3)4(C4H6NO)2(L)2]4+ (PtIII2 dimer; L = OH2, OH-, SO42-, etc.) and the re-reduction of the PtIII2 dimer into the PtII2 dimer by hydroquinone were found to be thermodynamically favorable. With an excess of hydroquinone, the rate of the catalytic reaction exceeds that of the former reaction and is roughly linear to the hydroquinone concentration, suggesting that a certain intermediate formed in the reaction between the PtII2 dimer and O2 plays a major role in the present catalysis. In addition, hydrolysis equilibria for the axial aqua ligands on the PtIII2 dimer are investigated spectrophotometrically.",
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N2 - The catalytic effect of [PtII2(NH3)4(C4H6NO)2]2+ (PtII2 dimer; C4H6NO = α-pyrrolidonate) in the O2 oxidation of hydroquinone to quinone is investigated at pH 5. Both the O2 oxidation of this dimer into [PtIII2(NH3)4(C4H6NO)2(L)2]4+ (PtIII2 dimer; L = OH2, OH-, SO42-, etc.) and the re-reduction of the PtIII2 dimer into the PtII2 dimer by hydroquinone were found to be thermodynamically favorable. With an excess of hydroquinone, the rate of the catalytic reaction exceeds that of the former reaction and is roughly linear to the hydroquinone concentration, suggesting that a certain intermediate formed in the reaction between the PtII2 dimer and O2 plays a major role in the present catalysis. In addition, hydrolysis equilibria for the axial aqua ligands on the PtIII2 dimer are investigated spectrophotometrically.

AB - The catalytic effect of [PtII2(NH3)4(C4H6NO)2]2+ (PtII2 dimer; C4H6NO = α-pyrrolidonate) in the O2 oxidation of hydroquinone to quinone is investigated at pH 5. Both the O2 oxidation of this dimer into [PtIII2(NH3)4(C4H6NO)2(L)2]4+ (PtIII2 dimer; L = OH2, OH-, SO42-, etc.) and the re-reduction of the PtIII2 dimer into the PtII2 dimer by hydroquinone were found to be thermodynamically favorable. With an excess of hydroquinone, the rate of the catalytic reaction exceeds that of the former reaction and is roughly linear to the hydroquinone concentration, suggesting that a certain intermediate formed in the reaction between the PtII2 dimer and O2 plays a major role in the present catalysis. In addition, hydrolysis equilibria for the axial aqua ligands on the PtIII2 dimer are investigated spectrophotometrically.

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