SYNTHESIS AND CRYSTAL-STRUCTURE OF THE OL IGOMERIC IODO-D(10)-METALATES(II) [M(I)(CH3CN)(4)](4)[CD6I16].1.5CH(3)CN WITH M(I)=CU, LI

The reaction of CuI or MI with CdI2 in the polar solvent acetonitrile results in the formation of the iodocadmates [Cu(CH3CN)(4)](4)[Cd6I16] . 1.5CH(3)CN (1) and [Li(CH3CN)(4)](4)[Cd6I16] . 1.5CH(3)CN (2) with the oligomeric anion [Cd6I16](4-). This new type of halometallate anio n, which is found in both isotypic structures, is built up by six alte rnating corner and edge sharing CdI4 tetrahedra. 1: Space group P (1) over bar (No 2), a = 838.5(4), b = 1465.9(9), c = 1929.8(6) pm, alpha = 93.01(3), beta = 99.13(3), gamma = 105.11(3)degrees; 1: Space group P (1) over bar (No 2), a = 841.7(8), b = 1470(9), c = 1945.5(9) pm, al pha = 93.27(5), beta = 99.13(5), gamma = 104.83(5)degrees.