A Kinetic Study of the Formation of the Cobalt-Glycylglycine-Oxygen Complex<sup>1,2</sup>

Tanford, Charles; Kirk, David C.; Chantooni, M. K.

doi:10.1021/ja01650a018

Cited by 31 publications

(8 citation statements)

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“…is released in the transformation to the red species (I). The pH behaviour on oxygenation of the cobalt-leucyltyrosine system is therefore the same as that found by Tanford et al 4 In acid solution, at pHG4.0, there is no reaction between molecular oxygen and the Co(I1) complexes. We have found that upon heating on a water bath a mixture of the green decammine-p-peroxobicobalt pentanitrate with DL-, LLleucyltyrosine or glycylglycine at pH 4.0, the deep red colours characteristic of the oxygenated peptide complexes were formed after 2 h. The spectral intensity was about the same as the oxygenated cobalt complexes of the dipeptides obtained by interaction with molecular oxygen in alkaline solution.…”

Section: 23supporting

confidence: 84%

Effects of optical configuration of peptides. Part 3.—Configurational aspects of the oxygenated cobalt diastereomeric leucyltyrosine complexes

Miller¹,

Li²

1961

Trans. Faraday Soc.

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The first and second papers in this series 1 dealt with differences in stability constants and rates of oxygen uptake of metal complexes of the diastereomeric DL-and LL-leucyltyrosines. In this paper, magnetic, polarographic, pH and ion-exchange data are presented to show that the configuration of the red species obtained on oxygenation of cobalt complexes of the leucyltyrosines (LT) is the same as the corresponding glycylglycine complex. The postulated structure is : ((LT)~CO-(O~)(OH)-CO(LT)~)-~, with the oxygen and hydroxyl as the bridging groups. The complex formed with the DL-isomer is more stable than the LL-isomer. In the unbuffered range of pH 9 to 10, when oxygen is bubbled through a Co(I1)-leucyltyrosine mixture, the initial decrease in pH, accompanied by the formation of a brown colour, is more rapid for the LL-isomer than the DL-isomer of leucyltyrosine. The brown colour was then transformed to the red product, accompanied by a pH increase. It is postulated that the brown species has one more OH-per mole than the red species, and in the transformation, the OH-is reIeased causing an increase in pH.

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Section: 23supporting

confidence: 84%

Effects of optical configuration of peptides. Part 3.—Configurational aspects of the oxygenated cobalt diastereomeric leucyltyrosine complexes

Miller¹,

Li²

1961

Trans. Faraday Soc.

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“…Some of these complexes were also identified earlier by several other authors. [22][23][24] Since our results above suggest that a passive layer, perhaps a Co oxide, is formed in the presence of H 2 O 2 at pH 10, several amino acids were investigated as possible complexing agents to enhance Co RRs. Three different amino acids -arginine, lysine, and proline -were chosen since we had considerable experience with them.…”

Section: Effect Of H 2 O 2 On Co and Cu E Oc 'S-mentioning

confidence: 99%

Cobalt Polishing with Reduced Galvanic Corrosion at Copper/Cobalt Interface Using Hydrogen Peroxide as an Oxidizer in Colloidal Silica-Based Slurries

Peethala¹,

Amanapu²,

Lagudu³

et al. 2012

J. Electrochem. Soc.

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A colloidal silica-based slurry with H 2 O 2 (1 wt%) as the oxidizer and arginine (0.5 wt%) as the complexing agent was found to polish cobalt (Co) with superior performance (better post-polish surface quality and no pit formation) at pH 10 compared to pH 6 and 8. At pH 10, there is no measurable dissolution of Co and an open circuit potential (E oc ) difference of ∼20 mV between Cu and Co, suggestive of reduced galvanic corrosion. Our results also suggest that, during polishing, the Co film surface was covered with a passive film, possibly of Co(III) oxides. Addition of 5 mM BTA to this slurry inhibited Cu dissolution rates and yielded a Co/Cu removal rate ratio of ∼1.2 while further reducing the E oc difference between Cu and Co to ∼10 mV, both very desirable attributes. The roles of H 2 O 2 , arginine, and silica abrasives as well as the pH on the Co material removal process are discussed and a removal mechanism is proposed.

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“…The kinetics of the oxygenation of the cobalt(II) glycylglycine complex in solution was investigated (47).…”

Section: Mechanisms and Structuresmentioning

confidence: 99%

Synthetic Reversible Oxygen-Carrying Chelates.

Vogt¹,

Faigenbaum²,

Wiberly³

1963

Chem. Rev.

139

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A Kinetic Study of the Formation of the Cobalt-Glycylglycine-Oxygen Complex^1,2

Cited by 31 publications

References 0 publications

Effects of optical configuration of peptides. Part 3.—Configurational aspects of the oxygenated cobalt diastereomeric leucyltyrosine complexes

Effects of optical configuration of peptides. Part 3.—Configurational aspects of the oxygenated cobalt diastereomeric leucyltyrosine complexes

Cobalt Polishing with Reduced Galvanic Corrosion at Copper/Cobalt Interface Using Hydrogen Peroxide as an Oxidizer in Colloidal Silica-Based Slurries

Synthetic Reversible Oxygen-Carrying Chelates.

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A Kinetic Study of the Formation of the Cobalt-Glycylglycine-Oxygen Complex1,2

Cited by 31 publications

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Effects of optical configuration of peptides. Part 3.—Configurational aspects of the oxygenated cobalt diastereomeric leucyltyrosine complexes

Effects of optical configuration of peptides. Part 3.—Configurational aspects of the oxygenated cobalt diastereomeric leucyltyrosine complexes

Cobalt Polishing with Reduced Galvanic Corrosion at Copper/Cobalt Interface Using Hydrogen Peroxide as an Oxidizer in Colloidal Silica-Based Slurries

Synthetic Reversible Oxygen-Carrying Chelates.

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A Kinetic Study of the Formation of the Cobalt-Glycylglycine-Oxygen Complex^1,2