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Iron(III) complexes of bis (benzimidazol-2-yl) methyl) thiophene-2,5-dicarboxamide: Synthesis, spectral and oxidation of o-phenylenediamine

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Title: Iron(III) complexes of bis (benzimidazol-2-yl) methyl) thiophene-2,5-dicarboxamide: Synthesis, spectral and oxidation of o-phenylenediamine
Authors: Tyagi, Nidhi1, Mathur, Pavan pavanmat@yahoo.co.in
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Oct2012, p759-767. 9p.
Subjects: Iron ions, Metal complexes, Benzimidazoles, Thiophenes, Phenylenediamines, Complex compounds synthesis, Chemical reactions
Abstract: Abstract: Iron(III) complexes of a potentially pentadentate ligand N2, N5-bis ((1H-benzo [d] imidazol-2-yl) methyl) thiophene-2,5-dicarboxamide are synthesized with an exogenous anion X=Cl−, . Mössbauer and EPR spectroscopy indicates axially distorted complexes. These complexes were utilized for the oxidation of o-phenylenediamine to 2,3-diaminophenazine in presence of H2O2. The initial rate of reaction is dependent on the concentration of o-phenylenediamine as well as the iron(III) complex. Rates of reaction were found to be at least five times higher for the Cl− bound complex. The effect of an added anion like acetate, azide and citrate is found to inhibit the rate of reaction. This suggests that one of the factors affecting the rate determining step is the binding of these anions on a vacant site at the iron(III) centre. The oxidation of o-phenylenediamine to 2,3-diaminophenazine is reminiscent of the functioning of horse radish peroxidase. [Copyright &y& Elsevier]
Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 80222296
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Iron(III) complexes of bis (benzimidazol-2-yl) methyl) thiophene-2,5-dicarboxamide: Synthesis, spectral and oxidation of o-phenylenediamine
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  Data: <searchLink fieldCode="AR" term="%22Tyagi%2C+Nidhi%22">Tyagi, Nidhi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mathur%2C+Pavan%22">Mathur, Pavan</searchLink><i> pavanmat@yahoo.co.in</i>
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  Data: <searchLink fieldCode="DE" term="%22Iron+ions%22">Iron ions</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+complexes%22">Metal complexes</searchLink><br /><searchLink fieldCode="DE" term="%22Benzimidazoles%22">Benzimidazoles</searchLink><br /><searchLink fieldCode="DE" term="%22Thiophenes%22">Thiophenes</searchLink><br /><searchLink fieldCode="DE" term="%22Phenylenediamines%22">Phenylenediamines</searchLink><br /><searchLink fieldCode="DE" term="%22Complex+compounds+synthesis%22">Complex compounds synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink>
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  Data: Abstract: Iron(III) complexes of a potentially pentadentate ligand N2, N5-bis ((1H-benzo [d] imidazol-2-yl) methyl) thiophene-2,5-dicarboxamide are synthesized with an exogenous anion X=Cl−, . Mössbauer and EPR spectroscopy indicates axially distorted complexes. These complexes were utilized for the oxidation of o-phenylenediamine to 2,3-diaminophenazine in presence of H2O2. The initial rate of reaction is dependent on the concentration of o-phenylenediamine as well as the iron(III) complex. Rates of reaction were found to be at least five times higher for the Cl− bound complex. The effect of an added anion like acetate, azide and citrate is found to inhibit the rate of reaction. This suggests that one of the factors affecting the rate determining step is the binding of these anions on a vacant site at the iron(III) centre. The oxidation of o-phenylenediamine to 2,3-diaminophenazine is reminiscent of the functioning of horse radish peroxidase. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.saa.2012.07.004
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 759
    Subjects:
      – SubjectFull: Iron ions
        Type: general
      – SubjectFull: Metal complexes
        Type: general
      – SubjectFull: Benzimidazoles
        Type: general
      – SubjectFull: Thiophenes
        Type: general
      – SubjectFull: Phenylenediamines
        Type: general
      – SubjectFull: Complex compounds synthesis
        Type: general
      – SubjectFull: Chemical reactions
        Type: general
    Titles:
      – TitleFull: Iron(III) complexes of bis (benzimidazol-2-yl) methyl) thiophene-2,5-dicarboxamide: Synthesis, spectral and oxidation of o-phenylenediamine
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            NameFull: Tyagi, Nidhi
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            NameFull: Mathur, Pavan
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            – D: 01
              M: 10
              Text: Oct2012
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              Y: 2012
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            – TitleFull: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy
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