The effect of pH and complexation of amino acid functionality on the redox chemistry of methionine and X-Ray structure of [Co(en)2(L-Met)](ClO4)2.H2O

Sanaullah; George S. Wilson; Richard S. Glass

doi:10.1016/0162-0134(94)85031-3

The effect of pH and complexation of amino acid functionality on the redox chemistry of methionine and X-Ray structure of [Co(en)₂(L-Met)](ClO₄)₂.H₂O

Sanaullah
, George S. Wilson
, Richard S. Glass

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Anodic oxidation of methionine under different pH conditions is reported. The results are compared with the oxidation process when the glycinic terminus of methionine is coordinated with Co(III). Synthesis of [Co(en)₂(L-Met)](ClO₄)₂, [Co(trien)(L-Met)](CF₃SO₃)₂, and [Co(trien)(OSO₂CF₃)₂]CF₃SO₃ is reported where L-Met = L-methionine, en = ethylenediamine, trien = triethylenetetraamine. The triflato complex ([Co(trien)(OSO₂CF₃)₂]CF₃SO₃) can serve as a starting material for synthesizing a variety of complexes. The x-ray structure of [Co(en)₂(L-Met)](ClO₄)₂.H₂O is also presented The complex crystallizes in space group P2₁ of the mono-clinic system with two independent molecules in the crystallographic asymmetric unit. The unit cell dimensions are a = 9.582 (2) Å, b = 11.554 (2) Å, c = 19.988 (6) Å, and f = 98.85 (2)°. The two molecular units are related by a pseudo-center of symmetry. The electrochemical data presented here suggest a major role of the neighboring group and pH in defining the ease of oxidation of methionine.

Original language	English (US)
Pages (from-to)	87-99
Number of pages	13
Journal	Journal of Inorganic Biochemistry
Volume	55
Issue number	2
DOIs	https://doi.org/10.1016/0162-0134(94)85031-3
State	Published - Aug 1 1994
Externally published	Yes

ASJC Scopus subject areas

Biochemistry
Inorganic Chemistry

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@article{15112af35d374b4882c5fb50327a8364,

title = "The effect of pH and complexation of amino acid functionality on the redox chemistry of methionine and X-Ray structure of [Co(en)2(L-Met)](ClO4)2.H2O",

abstract = "Anodic oxidation of methionine under different pH conditions is reported. The results are compared with the oxidation process when the glycinic terminus of methionine is coordinated with Co(III). Synthesis of [Co(en)2(L-Met)](ClO4)2, [Co(trien)(L-Met)](CF3SO3)2, and [Co(trien)(OSO2CF3)2]CF3SO3 is reported where L-Met = L-methionine, en = ethylenediamine, trien = triethylenetetraamine. The triflato complex ([Co(trien)(OSO2CF3)2]CF3SO3) can serve as a starting material for synthesizing a variety of complexes. The x-ray structure of [Co(en)2(L-Met)](ClO4)2.H2O is also presented The complex crystallizes in space group P21 of the mono-clinic system with two independent molecules in the crystallographic asymmetric unit. The unit cell dimensions are a = 9.582 (2) {\AA}, b = 11.554 (2) {\AA}, c = 19.988 (6) {\AA}, and f = 98.85 (2)°. The two molecular units are related by a pseudo-center of symmetry. The electrochemical data presented here suggest a major role of the neighboring group and pH in defining the ease of oxidation of methionine.",

author = "Sanaullah and Wilson, \{George S.\} and Glass, \{Richard S.\}",

year = "1994",

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T1 - The effect of pH and complexation of amino acid functionality on the redox chemistry of methionine and X-Ray structure of [Co(en)2(L-Met)](ClO4)2.H2O

AU - Sanaullah,

AU - Wilson, George S.

AU - Glass, Richard S.

PY - 1994/8/1

Y1 - 1994/8/1

N2 - Anodic oxidation of methionine under different pH conditions is reported. The results are compared with the oxidation process when the glycinic terminus of methionine is coordinated with Co(III). Synthesis of [Co(en)2(L-Met)](ClO4)2, [Co(trien)(L-Met)](CF3SO3)2, and [Co(trien)(OSO2CF3)2]CF3SO3 is reported where L-Met = L-methionine, en = ethylenediamine, trien = triethylenetetraamine. The triflato complex ([Co(trien)(OSO2CF3)2]CF3SO3) can serve as a starting material for synthesizing a variety of complexes. The x-ray structure of [Co(en)2(L-Met)](ClO4)2.H2O is also presented The complex crystallizes in space group P21 of the mono-clinic system with two independent molecules in the crystallographic asymmetric unit. The unit cell dimensions are a = 9.582 (2) Å, b = 11.554 (2) Å, c = 19.988 (6) Å, and f = 98.85 (2)°. The two molecular units are related by a pseudo-center of symmetry. The electrochemical data presented here suggest a major role of the neighboring group and pH in defining the ease of oxidation of methionine.

AB - Anodic oxidation of methionine under different pH conditions is reported. The results are compared with the oxidation process when the glycinic terminus of methionine is coordinated with Co(III). Synthesis of [Co(en)2(L-Met)](ClO4)2, [Co(trien)(L-Met)](CF3SO3)2, and [Co(trien)(OSO2CF3)2]CF3SO3 is reported where L-Met = L-methionine, en = ethylenediamine, trien = triethylenetetraamine. The triflato complex ([Co(trien)(OSO2CF3)2]CF3SO3) can serve as a starting material for synthesizing a variety of complexes. The x-ray structure of [Co(en)2(L-Met)](ClO4)2.H2O is also presented The complex crystallizes in space group P21 of the mono-clinic system with two independent molecules in the crystallographic asymmetric unit. The unit cell dimensions are a = 9.582 (2) Å, b = 11.554 (2) Å, c = 19.988 (6) Å, and f = 98.85 (2)°. The two molecular units are related by a pseudo-center of symmetry. The electrochemical data presented here suggest a major role of the neighboring group and pH in defining the ease of oxidation of methionine.

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The effect of pH and complexation of amino acid functionality on the redox chemistry of methionine and X-Ray structure of [Co(en)₂(L-Met)](ClO₄)₂.H₂O

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