Two Novel Purely Inorganic Coordination Polymers Constructed From Bivalent Transition Metal Ions and Paratungstate Clusters

Abstract

The new polymeric compounds (NH4)8[Cu(H2O)2H2W12O42]·10H2O (1) and (NH4)4[Co(H2O)2][Co(H2O)4]2[H2W12O42]·8H2O (2) have been synthesized in aqueous solution and characterized by elemental analysis, TG analysis. Single crystal X-ray diffraction revealed that the [H2W12O42]10− (named paratungstate-B) units act as tetradentate and octadentate ligands, respectively. In compound 1, two neighboring paratungstate-B clusters are linked by [Cu(H2O)2]2+ units leading to the formation of 1D chain. In crystal of 2, each cobalt ion links two paratungstate-B clusters, while each [H2W12O42]10− block is surrounded by two [Co(H2O)2]2+ and four [Co(H2O)4]2+ bridging cations resulting a 2D sheet formed parallel to the $$ [10\bar{1}] $$ plane. Each [H2W12O42]10− cluster is linked via two uniform [Co(H2O)4]2+ (Co2) bridging groups to form a 1D double-chain along the b axis. The chains are then connected via [Co(H2O)2]2+ (Co1) to form 2D layered networks parallel to the $$[10\bar{1}]$$ plane.