Exploring control of cadmium halide coordination polymers via control of cadmium(II) coordination sites utilizing short multidentate ligands

The goal of this project has been to determine the capability of a number of linear multidentate ligands to induce extended structures in cadmium halides. Metal salts of the form CdX2 (X=Cl, Br, I), and for comparison Cd(NO3)2, were complexed with diethylene glycol (EO2), triethylene glycol monomethyl ether (EO3Me), triethylene glycol dimethyl ether (a glyme, EG3), diethylene triamine (EN2), and 1,3-propylenediamine (PN1). The crystal structures of 11 resulting complexes were structurally characterized including: [Cd(EO2)3][Cd2I6], [Cd(EN2)2]Cl2·H2O, [Cd(EN2)2]Br2, [Cd(EN2)2][CdI4], [CdCl2(EO3Me)]2, [CdBr2(EO3Me)]2, [Cd(NO3)2(EO3Me)], [(CdCl2)2(EG3)]n, [(CdBr2)2(EG3)]n, [CdI2(EG3)], and [CdI2(PN1)]n. While each structure is interesting in its own right, the continued observance of a wide variety of coordination modes for such similar ligands does little to help improve the predictability of simple Cd2+ coordination compounds.