An unusual Cu(II) polymeric compound with tridentate dehydronated and bidentate neutral ligand bis(pyrimidin-2-yl)amine (=Hdipm) and uncoordinated Hdipm in a complicated H-bonding system. Synthesis, characterization and X-ray structure of {[Cu(dipm)(Hdipm)](Hdipm)(CF 3SO 3)(C 2H 5OH)(H 2O)} n

Abstract

A highly unusual polymeric copper(II) compound with formula {[Cu(dipm)(Hdipm)](Hdipm)(CF 3SO 3)(C 2H 5OH)(H 2O)} n (in which Hdipm = bis(pyrimidin-2-yl)amine) has been synthesized and characterized by X-ray crystallography, infrared spectroscopy and EPR. The Cu(II) ion is surrounded by five nitrogen atoms. The basal plane is formed by two nitrogen atoms from a neutral Hdipm ligand and two nitrogen atoms from a dehydronated (dipm) − ligand with Cu–N distances which vary from 1.990(3) to 2.093(3) Å. The fifth nitrogen atom originate from a neighbouring anionic ligand with a Cu–N distance of 2.183(4) Å, forming a distorted trigonal bipyramidal geometry around the Cu(II) ion. Furthermore the lattice are contains an uncoordinating Hdipm ligand (stacked on other ligands), one triflate anion, one ethanol molecule and one water molecule. The 2D system of Hydrogen bonds consists of Watson–Crick-type intermolecular double H-bonds between pairs of dipm molecules and H-bonds between the triflate anion, the ethanol and water molecules. The ligand-field and EPR spectra are uneventful and agree with the found coordination geometry. Cu(II) hyperfine splitting remains unresolved.