Hybrid inorganic-organic 1-D and 2-D frameworks with {As8V14O42} clusters as building blocks

Three novel hetero-polyoxovanadates, [Cd(2.2'-bpy)(3)]{[Cd(dien)]As8V14O42 (H2O)} (1, 2.2'-bpy = 2.2-bipyridine, and dien = diethylenetriamine), [Zn(2.2'-bpy)(2)](2)[As8V14O42(H2O)] center dot H2O (2) and [Ni(en)(2)](3)[As8V14O42 (HPO3)] center dot 4H(2)O (3, en = ethlenediamine), were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Crystal data: 1 monoclinic, P2(1)/n, a= 15.1728(5), b = 19.2863(5) c = 25.7122(9) angstrom beta = 96.005(2)degrees, Z = 4. 2, orthorhombic, P2(1)2(1)2(1), a = 12.1270(3), b = 15.8678(8) c = 40.0422(1) angstrom, Z = 4. 3, triclinic, P (1) over bar, a = 12.9340(3), b 13.4130(3), c = 21.1820(4) angstrom, alpha = 87.170(3)degrees; beta = 77.517(3)degrees, gamma = 68.480(3)degrees, Z = 2. Compounds 1-3 are all made of the {As8V14O42} shells linked by corresponding transition metal complexes into extended structures. Compound 1 and 2 present 1-D wave-like and tubular structures, respectively, while compound 3 exhibits a novel 2-D structure containing interwinding puckery layers. Variable temperature Susceptibility measurements demonstrate the presence of antiferromagnetic interaction between V-IV cations in 1 and 2. (C) 2005 Elsevier Inc. All rights reserved.