CADMIUM HEXACYANOIRIDATE(III) DODECAHYDRATE

Single crystals of tricadmium bis[hexacyanoiridate(III)] dodecahydrate , Cd-3[Ir(CN)(6)](2).12H(2)O, were synthesized by the 'slow-diffusion U-tube' method. The disordered structure crystallizes in the cubic spa ce group <Fm(3)over bar m> (No. 225) with a lattice constant of 10.848 (1) Angstrom and one-and-a-third molecules in the unit cell. Divalent Cd atoms are linked to the Ir atoms by linear cyanide bridges. When di sorder occurs cavities are formed, a water molecule, O2, replaces an I r atom and a cyanide bridge is replaced with a coordinated water molec ule, O1. A hydrogen-bonding network is set up between O1, O2, and O3 w ithin the cavities of the crystal lattice. Dehydration and IR studies were conducted on single crystals of the title compound. The compound is isostructural with the dodecahydrates of Cd-3[Co(CN)(6)](2) and Mn- 3[CO(CN)(6)](2).