A heteropolymetallic coordination polymer containing alkaline-earth (Ae) cation, lanthanide (Ln) cation and alkali (A) cation

摘要

A heteropolymetallic coordination polymer, [Ba_2Tb _4Na_4(pdc)_(10)(H_2O)_(24)] ·(H_2O)_(11), H_2pdc = pyridine-2,6- dicarboxylic acid, has been successfully designed, synthesized under hydrothermal condition, and characterized by elemental analysis, thermal analysis, IR spectrum, luminescence, as well as X-ray crystallography. Three different kinds of metal cations (Ae, Ln and A) could be connected simultaneously by a pdc~(2-) ligand with coordination mode i. A fundamental block consisting of 14-membered mixed-metal Ba(II)-Tb(III)-Na(I) rings was achieved, which shared common edges and constructed to form 2D infinite networks. The adjacent 2D networks were assembled into a 3D polymeric framework via O-H?O hydrogen bonds. Sodium hydroxide was introduced not only to deprotonate the carboxylic groups of H_2pdc, but also take part in the coordination under higher temperature and pressure. The convenient synthesis developed in this paper seemed to have a wide applicability in designing new heteropolymetallic systems.