Abstract
The aqua-bis(ethylenediamine)-chloro-copper(II) chloride complex, [Cu(en)(2)(H(2)O)(Cl)]Cl (1), was synthesized by direct interaction of CuCl(2)×2H(2)O with pepa (pepa is a polyethylenepolyamine containing ethylenediamine (en)). The crystalline complex 1 was characterized by IR spectra and structurally studied. Crystals of this complex consist of the [Cu(en)(2)(H(2)O)(Cl)](+) discrete cations, whose Cu(2+) ion is chelated by two en molecules. The Cu(II) coordination polyhedron has the shape of an elongated square bipyramid, in which four nitrogen atoms of the -NH(2) groups of en molecules form the base of this bipyramid, and the oxygen atom of the water molecule and Cl(-) are in its apical positions. Three-dimensional framework 1 is formed due to hydrogen bonds O-H…Cl and N-H…Cl. The Cu(II)-(H(2)NC(2)H(4)NH(2)) chelation was studied by DFT using the 6-31G* basis set. The calculated electron-stereochemical parameters are in good agreement with the ability of complex 1 to simultaneously be a flame retardant and a curing agent of epoxy resins.