No abstract

Fabricated by cyano-and alkoxyl-bridged groups, a novel three-dimensional structural compound,, has been formed. In the structure, there exist two kinds of W atoms and three types of Cu 2 O 2 pairs. The W(1) and W(2) atoms, with oxidation states ϩ5 and ϩ4 respectively, are each linked to the Cu 2 O 2 units through two of its eight cyanide ligands, forming two kinds of 1D zigzag chain along the c-axis (nominally the W1-chain and the W2-chain). Each W2-chain is connected to four adjacent W1-chains through a third type of Cu 2 O 2 unit, leading to the formation of a three-dimensional open framework with channels generated along the [001] direction. The structure may also be viewed as being constructed from W(1)Cu 3 and W(2)Cu 4 clusters, cross-linked by µ-O bridges. The magnetic properties show that the complex displays 3D antiferromagnetic ordering below 2.2 K, although ferromagnetic interactions are present within the W(1)Cu 3 clusters. The dominant antiferromagnetic coupling at low temperature is attributed to the antiferromagnetic exchanges between the W(1)Cu 3 clusters through the alkoxyl bridges.