Two novel bimetallic transition metal-uranyl one-dimensional coordination polymers with manganese(II) and cobalt(II) incorporating bridging diglycolate (2,2'-oxydiacetate) ligands

摘要

The crystal structures of two new bimetallic uranyl-transition metal compounds with diglycolic acid [or 2-(carboxymethoxy)acetic acid] have been hydro-thermally synthesized and structurally characterized via single-crystal X-ray diffraction. The compounds, namely catena-poly[[[tetraaquamanganese(II)]-mu-2,2'-oxydiacetato-[dioxidouranium(VI)]-mu-2,2'-oxydiacetato] dihydrate], {[MnU-(C_4H_4O_5)_2O_2(H_2O)_4]·2H_2O}_n, and catena-poly[[[tetraaquacobalt(II)]-mu-2,2'-oxy-diacetato-[dioxidouranium(VI)]-mu-2,2'-oxydiacetato] dihydrate], {[CoU(C_4H_4-O_5)_2O_2(H_2O)_4]·2H_2O}_n, both crystallize in the triclinic space group P1. These compounds form one-dimensional chains via alternating uranyl and transition metal building units. The chains then assemble into three-dimensional supra-molecular networks through several hydrogen bonds between water molecules and diglycolate ligands. Luminescence measurements were conducted and no uranyl emission was observed in either compound.