POLYETHYLENE-GLYCOL COMPLEXATION OF CD2- STRUCTURES OF TRIETHYLENE GLYCOL COMPLEXES OF CDCL2, CDBR2 AND CDI2( )

The reactions of 1:1 molar quantities of triethylene glycol (EO3) and CdX2 (X = Cl, Br, I) in 3:1 CH3CN:CH3OH produced three different compl exes which have been structurally characterized. In [Cd2(EO3)2(mu-EO3) ]Cl4.2H2O, one EO3 ligand coordinates exclusively to one metal ion, wh ile a second type of glycol coordination features donor interactions w ith two different Cd2+ ions producing two six-coordinate metal centers in the dimer. [Cd2Br4(EO3)2] contains two seven-coordinate Cd2+ cente rs and is dimeric via two bridging bromide interactions. [Cd(EO3)2][Cd I4] consists of eight-coordinate Cd2+ complex cations hydrogen bonded to [CdI4]2- anions.