Two new hydrogen bond-supported supramolecular compounds assembly from tungsten-vanadium polyoxoanions and copper complex fragments

Abstract

Two new supramolecular compounds based on tungsten-vanadium polyoxoanions formulated as [Cu(2,2′-bipy)3]2H14[PW 2.2V9.8O40(VO)2[Cu(2,2′-bipy) 2H2O]2][PW2.2V9.8 O40(VO)2]·10H2O (1) and [Cu4(2,2′-bipy)4(H2O)2 (PO4)2]H6.5[PW8.4V 3.6O40]·2H2O (2) (2,2′-bipy=2,2′-bipyridine) have been synthesized hydrothermally and characterized by IR, TG, XPS and X-ray diffraction analyses. Crystal structure analyses reveal that compounds 1 and 2 exhibit novel 2D supramolecular layer structures constructed from tungsten-vanadium polyoxoanions and different types of secondary building units (SBUs), respectively, the different SBUs are formed by [Cu(2,2′-bipy)2H2O]2+ and [Cu(2,2′-bipy)3]2+ cations in compound 1 and [Cu4(2,2′-bipy)4(H2O)2 (PO4)2]2+ cations in 2, respectively. Study of magnetic properties indicated the presence of antiferromagnetic behaviors for both compound 1 and 2. © 2009 Elsevier Inc. All rights reserved.