Self-assembly of four new extended architectures based on reduced polyoxometalate clusters and cadmium complexes

摘要

Four new [P4Mo6] cluster-based extended structures containing cadmium complexes, [Cd-3(4,4'-Hbpy)(2)(4,4'-bpy)(2)(H2O)(8)][Cd(H2PO4)(2)(HPO4)(4)(PO4)(2)(MoO2)(12)(OH)(6)]center dot 7H(2)O 1, (4,4'-Hbpy)(2)[Cd(4,4'-bpy)(3)(H2O)(3)][Cd(4,4'-bpy)(H2O)](2)[Cd(H2PO4)(2)(HPO4)(4) (PO4)(2) (MoO2)(12)(OH)(6)]center dot H2O 2, [Cd-4(phen)(2)(H2O)(4)][Cd(phen)(H2O)](2)[Cd(HPO4)(4) (HPO4)(4)(MoO2)(12)(OH)(6)]center dot 5H(2)O 3 and [Cd-4(2,2'-bpy)(2)(H2O)(4)][Cd(2,2'-bpy)(H2O)](2) [Cd(HPO4)(4)(HPO4)(4)(MoO2)(12)(OH)(6)]center dot 3H(2)O 4 (4,4'-bpy = 4,4'-bpyridine, phen = 1,10-phenanthroline, 2,2'-bpy = 2,2'-bpyridine), have been synthesized and characterized by elemental analysis, IR, TG and single crystal X-ray diffraction. The structure of compound 1 is constructed from the Cd[P4Mo6](2) dimers linked by [Cd-3(4,4'-Hbpy)2(4,4'-bpy)(2)(H2O)(8)] subunits to generate a plane layer. Compound 2 consists of the positive 2D sheets that constructed from Cd[P4Mo6](2) dimers linked by [Cd(4,4'-bpy)(H2O)] complexes, then the 2D sheets are further linked up together to form a 3D supramolecular framework via extensive hydrogen-bonding interactions among the [P4Mo6] clusters, free 4,4-bpy molecules, dissociated [Cd(4,4'-bPY)(3)(H2O)(3)](2+) complexes and water molecules. Compounds 3 and 4 show new 2D layered structure, with Cd[P4Mo6](2) building blocks connected by tetra-nuclear [Cd-4{(phen)(2)/(2,2'-bpy)(2)}(H2O)(4)] clusters and [Cd(phen/2,2'-bpy)(H2O)] complexes. The fluorescent activities of compounds 3 and 4 are reported. (c) 2006 Elsevier Inc. All rights reserved.