Construction of bimetallic oxide materials from molybdate building blocks and copper-ligand tethers with flexible spaces: Structures of the two-dimensional [{Cu2(L4)(H2O)2}Mo8O26(H2O)2] and of the three-dimensional [{Cu2(L4)}2(Mo8O26) (MoO4)21 (L4=N1, N1, N4, N4-tetrakis(pyridin-2-ylmethyl)butane-1,4-diamine)

The hydrothermal reactions of cupric acetate. MoO3 and the dipodal linker ligand N-1, N-1, N-4, N-4-tetrakis (pyridin-2-ylmethyl)butane-1,4-diamine (L4) provided a high temperature phase [{Cu-2(L4)(H2O)(2)}Mo8O26 (H2O)(2)]center dot 2H(2)O (1 center dot 2H(2)O) and a low temperature phase [{Cu-2(L4)}(2){Mo8O26}{MoO4}(2)]center dot 2H(2)O (2 center dot 2H(2)O). Compound 1 is two-dimensional, constructed from (Mo8O26(H20)2}(4-) clusters linked through {Cu-2(L4) (H2O)(2)}(4+) rods. In contrast, compound 2 is three-dimensional with two distinct molybdate building blocks, gamma-(Mo8O26}(4-) clusters and {MoO4}(2-) tetrahedra, linked through two distinct {Cu-2(L4)}(4+) subunits, one connecting four (MoO4)(2+) tetrahedra and the second a {MoO4}(2+) tetrahedron and one octamolybdate cluster. (C) 2010 Elsevier B.V. All rights reserved.