CHARACTERIZATION AND CRYSTAL STRUCTURE STUDY OF A NEW Cu(II) COMPLEX OF PYRIDINE-2,6-DICARBOXYLIC ACID AND ANILINE CONTAINING A WATER CLUSTER
U. Ibotomba Singh, R.K. Bhubon Singh, M.J. Borah, J.P. Jasinski, J.A. Golen
Keywords: pyridine-2,6-dicarboxylate complex, monoclinic, octahedral, copper(II) complex, water cluster, crystal structure
Abstract
A new monoclinic Cu(II) salt complex (C6H6N)2+ [Cu(2,6-dipico)2]2–⋅6H2O, (2,6-dipico = pyridine-2,6-dicarboxylic acid) is synthesized and characterised by CHN analyses, IR, UV-Vis, magnetic susceptibility measurements, and single crystal X-ray crystallography. The structure contains two pyridine-2,6-dicarboxylate species as tridentate ligands with protonated aniline acting as a counter cation and six uncoordinated water molecules. The complex crystallizes in the monoclinic space group C2/c with unit cell parameters a = 20.9393(4) Å, b = 7.94330(10) Å, c = 19.9093(4) Å, V(Å3) = 2932.32(9), Z = 4. Crystal packing is stabilized by N—H…O, O—H…O intermolecular hydrogen bonds and weak π…π interactions. The water molecules are trapped by a cooperative association of coordination interactions forming water clusters as well as by a hydrogen bond to the Cu (II) complex.
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