CRYSTAL STRUCTURE OF BIS-ETHYLENEDIAMINE TRITHIOCYANATE OF COPPER（Ⅱ） AND SILVER（Ⅰ） Cu（en）2Ag（SCN）3

Cu（en）Ag（SCN）crystallizes in space group P222with its cell parameters, a=7.126（2）, b=12.587（5）, c=17.585（5）. There are four formula units per unit cell(ρbs.=1.90g/cm, ρ. Diffraction data are collected on a CAD4 four-circle diffractometer using Mo-Ka radiation. The structure is determiued by heavy atom method, then refined by leastsquare method to a final R=0.036. It is shown that in the crystal the coordination of Cu atoms is square pyramidal with four N atoms of en groups in the square plane and oue Natom of thiocyanate group in the apical position. The Ag atom is coordinated tetrahedrally by four S atoms of thiocyanate groups, one of which links up two AgStogether, thus forming the infinite AgStetrahedron chains along a axis.