TRIGONAL PLANAR CUX(3)-GROUPS IN CU(2)MO( 6)X(14), X=CL, BR, I

Cu2Mo6Cl14 (I), Cu2Mo6Br14 (II) and Cu2Mo6I14 (III) were synthesized b y thermal treatment of corresponding mixtures of copper(I) and molybde num(II) halides. The crystal structures were determined by single crys tal X-ray analyses. I and II show isotypism, cubic, Pn(3) over bar (no . 201, sec. setting), Z = 4, I: a = 12.772(3) Angstrom, II: a = 13.350 (2) Angstrom. III shows a new structural type, orthorhombic, Pbca (No. 61), Z = 4, a = 16.058(3) Angstrom, b = 10.643(2) Angstrom, c = 16.96 3(3) Angstrom. Trigonal planar CuX(3) units were found in I-III. Struc tural behaviour relations are discussed, especially with regard to ion ic conductivity.