Abstract
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.
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