Assembling of copper(II) dipicolinate complexes

作者：Das Babulal; Baruah Jubaraj B^*

来源：Polyhedron, 2012, 31(1): 361-367.

DOI：10.1016/j.poly.2011.09.039

• Dipicolinate
• Self-assembly
• Penta-coordination
• Metal complex as a ligand
• Dinuclear copper complexes

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)(3)L]center dot 4H(2)O (1) (L = dipicolinate anion) has a distorted octahedral structure with Z' = 2, whereas [CuL(py)(H2O)]center dot 2H(2)O (2) adopts distorted square pyramidal geometry. The bidentate ligands bpy and phen favor the formation of dinuclear complexes. The dinuclear complex [CuL(bpy)(mu-L)Cu(bpy)(H2O)]center dot 9H(2)O (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 degrees between the plane of L and bpy attached to one copper site, whereas it has an angle of 78.13 degrees 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)(mu-L)Cu(phen)(2)][CuL2]center dot 12H(2)O (4), has been structurally characterized. It has an unusual carboxylate bridge.

• 出版日期2012-1-4