Design and characterization of Cu(II) complexes from 2-benzoylpyridine benzhydrazone: Crystallographic evidence for coordination versatility |
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| Authors: | Neema Ani Mangalam Sarika Sivakumar MR Prathapachandra Kurup Eringathodi Suresh |
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| Institution: | 1. Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, Kerala 682 022, India;2. Analytical Science Discipline, Central Salt and Marine, Chemicals Research Institute, Bhavnagar 364002, Gujarat, India |
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| Abstract: | The syntheses and characterization of six copper(II) complexes of 2-benzoylpyridine benzhydrazone in the form of Cu(BPB)2], Cu(BPB)Cl]·H2O, Cu(BPB)Br], Cu2(BPB)2](ClO4)2·4H2O, Cu(BPB)N3]·H2O, and Cu(BPB)NCS]·H2O·CH3OH are reported. The analytical methods used for the characterization of complexes include partial elemental analyses, IR, electronic and EPR spectra, conductivity measurements, magnetic susceptibility measurements and single crystal X-ray diffraction. From the crystal structure, it is clear that the hydrazone adopts the E conformation about the azo bond to attach to the metal through the Npy–Nazo–O chelating system. In the EPR spectra of complexes in DMF at 77 K four hyperfine quartets in the parallel region could be resolved and a half field signal is observed at 1500 G for complex Cu2(BPB)2](ClO4)2·4H2O in polycrystalline state at 298 K which gives evidence for its binuclear nature indicating a weak interaction between the two Cu(II) ions. |
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