Synthesis and characterization of copper(I) halide/pseudohalide adducts of 2-benzoylpyridine and x-ray crystal structure of [di-μ-iodo-bis(N,O-2-benzoylpyridine)dicopper(I)] |
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Authors: | Mohamed AS Goher Azza EH Abdou Wai-Hing Yip Thomas CW Mak |
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Institution: | Department of Chemistry, Faculty of Science, Alexandria University, P.O. Box 426 Ibrahimia, Alexandria 21321, Egypt Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong |
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Abstract: | Dark-brown copper(I) complexes of the type CuXL, for X = Cl, Br, I, SCN and N3, and orange-yellow complexes of the type (CuX)2L, for X = Cl or Br, where L = 2-benzoylpyridine, have been prepared and characterized. All complexes exhibit strong CT bands in the visible region and gave non-conducting solutions in acetone and nitrobenzene. The IR spectral data suggest that 2-benzoylpyridine acts as a monodentate ligand in the orange-yellow complexes and as a bidentate chelating ligand in the brown complexes, whereas bridging halides and pseudohalides exist in both types. The structure of the 1 : 1 black iodide complex, as determined by X-ray crystallography, features a discrete, centrosymmetric CuI(2-benzoylpyridine)]2 molecule with a short Cu Cu distance of 2.587(1) Å. Each copper atom in the dimeric molecule is tetrahedrally coordinated by two μ-iodine atoms and the carbonyl oxygen and nitrogen atoms of the chelating 2-benzoylpyridine ligand. The orange-yellow complexes display visible emission when excited in the UV region, whereas the brown complexes do not. |
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