Assembling of copper(II) dipicolinate complexes |
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Authors: | Babulal DasJubaraj B. Baruah |
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Affiliation: | Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India |
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Abstract: | The role of ancillary ligands, namely imidazole (im), pyridine (py), 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen) in the assembly of copper(II) dipicolinate complexes are presented. Mononuclear complexes are observed in the case of monodentate ligands. The mononuclear complex [Cu(im)3L]·4H2O (1) (L = dipicolinate anion) has a distorted octahedral structure with Z′ = 2, whereas [CuL(py)(H2O)]·2H2O (2) adopts distorted square pyramidal geometry. The bidentate ligands bpy and phen favor the formation of dinuclear complexes. The dinuclear complex [CuL(bpy)(μ-L)Cu(bpy)(H2O)]·9H2O (3) has one carbonyl oxygen atom of a carboxylate group of dipicolinate acting as a bridging ligand to the copper site that is devoid of a coordinated water molecule. The complex has an angle of 83.55° between the plane of L and bpy attached to one copper site, whereas it has an angle of 78.13° between the plane L and bpy attached to the other copper site. A 1,10-phenanthroline containing dinuclear copper(II) dipicolinate complex, [Cu(phen)(H2O)(μ-L)Cu(phen)2][CuL2]·12H2O (4), has been structurally characterized. It has an unusual carboxylate bridge. |
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Keywords: | Dipicolinate Self-assembly Penta-coordination Metal complex as a ligand Dinuclear copper complexes |
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