THE STRUCTURE AND EPR PROPERTIES OF (CH2OHCH2NH3)(2)CUCL4

The title compound is a member of the (RNH(3))(2)CuCl4 layer perovskit e family, space group C2/c, with a = 21.624(5), b = 7.511(1), c = 7.43 1(2)Angstrom, beta = 89.56(2)degrees and V = 1206.9(4)Angstrom(3) with Z = 4. In the antiferrodistortive structure, the Cu(II) ion assumes a n elongated octahedral coordination (unique Cu-Cl distances = 2.274(2) , 2.288(2), and 3.010(2)Angstrom). The octahedra share corners with fo ur neighbors to form a two-dimensional network. The-NH3 moieties hydro gen bond to the layers, so that the -C2H5OH moieties form sheathes abo ut each metal halide layer. A twofold disorder of the -C2H5OH groups i s observed. The EPR spectrum is investigated to help understand the ma gnetic properties of the systems. The g-values are consistent with str ong intralayer exchange coupling. The EPR linewidths show evidence of spin diffusion effects at liquid nitrogen temperature. However, at roo m temperature, the spin anisotropies lead to broadening of the EPR lin es through a phonon modulation mechanism.