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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−
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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− <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]
ISSN:13861425
DOI:10.1016/j.saa.2010.11.033