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Synthesis and spectral studies of copper complexes using a N-octylated bis benzimidazole diamide ligand

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Title: Synthesis and spectral studies of copper complexes using a N-octylated bis benzimidazole diamide ligand
Authors: Mohapatra, Subash Chandra1 subashcm@gmail.com, Mathur, Pavan pavanmat@yahoo.co.in
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Feb2011, Vol. 78 Issue 2, p612-616. 5p.
Subjects: Organocopper compounds, Metal complexes, Complex compounds spectra, Benzimidazoles, Fluorescence, Liquid nitrogen, Anions
Abstract: Abstract: Monomeric Cu(II) and Cu(I) complexes bound to a tetradentate bis-benzimidazole diamide ligand N,N′-bis(N-octyl benzimidazolyl-2yl)(methyl)pentane diamide (O-GBGA) have been isolated and characterized. X-Band EPR spectra of the copper(II) complexes in CH2Cl2 were recorded in a frozen solution as solvent at liquid nitrogen temperature. Solution spectra typically indicate a ground state (g || > g ⊥ >2.0023) and show less than four nuclear hyperfine lines with broadening of g ⊥ line in some cases, thus indicating distorted tetragonal geometry. One of the copper(II) complexes shows a five line N-SHF structure (16±1G) implying the binding of imine nitrogen of the benzimidazole to copper ion. α 2 ranges from 0.57–0.97 indicating considerable amount of covalent character in Cu–L bond. Anodic shifts in E 1/2 values indicate the retention of anion in the coordination sphere of Cu(II), E 1/2 values becoming anodic in the order C6H5COO−
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
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  Data: Synthesis and spectral studies of copper complexes using a N-octylated bis benzimidazole diamide ligand
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  Data: <searchLink fieldCode="AR" term="%22Mohapatra%2C+Subash+Chandra%22">Mohapatra, Subash Chandra</searchLink><relatesTo>1</relatesTo><i> subashcm@gmail.com</i><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="JN" term="%22Spectrochimica+Acta+Part+A%3A+Molecular+%26+Biomolecular+Spectroscopy%22">Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy</searchLink>. Feb2011, Vol. 78 Issue 2, p612-616. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Organocopper+compounds%22">Organocopper compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+complexes%22">Metal complexes</searchLink><br /><searchLink fieldCode="DE" term="%22Complex+compounds+spectra%22">Complex compounds spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Benzimidazoles%22">Benzimidazoles</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+nitrogen%22">Liquid nitrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Anions%22">Anions</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: Monomeric Cu(II) and Cu(I) complexes bound to a tetradentate bis-benzimidazole diamide ligand N,N′-bis(N-octyl benzimidazolyl-2yl)(methyl)pentane diamide (O-GBGA) have been isolated and characterized. X-Band EPR spectra of the copper(II) complexes in CH2Cl2 were recorded in a frozen solution as solvent at liquid nitrogen temperature. Solution spectra typically indicate a ground state (g || > g ⊥ >2.0023) and show less than four nuclear hyperfine lines with broadening of g ⊥ line in some cases, thus indicating distorted tetragonal geometry. One of the copper(II) complexes shows a five line N-SHF structure (16±1G) implying the binding of imine nitrogen of the benzimidazole to copper ion. α 2 ranges from 0.57–0.97 indicating considerable amount of covalent character in Cu–L bond. Anodic shifts in E 1/2 values indicate the retention of anion in the coordination sphere of Cu(II), E 1/2 values becoming anodic in the order C6H5COO− <SCN− <Cl−. The fluorescence quantum yield of complexes was found to be lower than that of the ligand O-GBGA (Φ =0.029) and the relative fluorescence data reveals that fluorescence of such compounds could distinguish between small and large anions. [ABSTRACT FROM AUTHOR]
– 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.2010.11.033
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 612
    Subjects:
      – SubjectFull: Organocopper compounds
        Type: general
      – SubjectFull: Metal complexes
        Type: general
      – SubjectFull: Complex compounds spectra
        Type: general
      – SubjectFull: Benzimidazoles
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      – SubjectFull: Fluorescence
        Type: general
      – SubjectFull: Liquid nitrogen
        Type: general
      – SubjectFull: Anions
        Type: general
    Titles:
      – TitleFull: Synthesis and spectral studies of copper complexes using a N-octylated bis benzimidazole diamide ligand
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            NameFull: Mohapatra, Subash Chandra
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            NameFull: Mathur, Pavan
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              Text: Feb2011
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              Y: 2011
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