Polymer Complexes. XLIII. EPR, Spectra, and Stereochemical Versatility of Novel Copper(II)Polymer Complexes

Abstract

Copper(II) polymer complexes of empirical formula [Cu(ligand)2X2] (where X = Cl, Br, I, NO3, and $$\frac{1}{2}$$ SO4) and [Cu(ligand)(CH3COO)2] have been prepared with poly(3-phenylacrylidine semicarbazone). All the polymer complexes prepared have been characterized by elemental analysis, magnetic moment, conductance, IR, electronic, 1H-NMR, and electronic paramagnetic resonance spectral studies. The polymer complexes [Cu(ligand)2X2] and [Cu(ligand) (CH3COO)2] may have tetragonal symmetry while the [Cu(ligand)2( $$\frac{1}{2}$$ SO4)2] may be five-coordinate trigonal bipyramidal in structure. All complexes exhibit normal magnetic moments corresponding to one unpaired electron except [Cu(ligand)(CH3COO)2] which shows a subnormal magnetic moment. EPR spectra of the polymer complexes have been studied with a view to assigning their stereochemistries. Various EPR parameters have been calculated. The g, A, G values for all the polymer complexes are consistent with a tetragonal 1–5 and trigonal bipyramidal 6 stereochemistry in the Cu(II) polymer complexes of homopolymer.