Self-assembly of four new extended architectures based on reduced polyoxometalate clusters and cadmium complexes |
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| Authors: | Ying Ma Ying Lu Xinlong Wang Xinxin Xu |
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| Institution: | Department of Chemistry, Institute of Polyoxometalate Chemistry, Northeast Normal University, Changchun 130024, PR China |
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| Abstract: | Four new P4Mo6] cluster-based extended structures containing cadmium complexes, Cd3(4,4′-Hbpy)2(4,4′-bpy)2(H2O)8]Cd(H2PO4)2(HPO4)4(PO4)2(MoO2)12(OH)6]·7H2O 1, (4,4′-Hbpy)2Cd(4,4′-bpy)3(H2O)3]Cd(4,4′-bpy)(H2O)]2Cd(H2PO4)2(HPO4)4 (PO4)2(MoO2)12(OH)6]·H2O 2, Cd4(phen)2(H2O)4]Cd(phen)(H2O)]2Cd(HPO4)4 (HPO4)4(MoO2)12(OH)6]·5H2O 3 and Cd4(2,2′-bpy)2(H2O)4]Cd(2,2′-bpy)(H2O)]2 Cd(HPO4)4(HPO4)4(MoO2)12(OH)6]·3H2O 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 CdP4Mo6]2 dimers linked by Cd3(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 CdP4Mo6]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 CdP4Mo6]2 building blocks connected by tetra-nuclear Cd4{(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. |
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| Keywords: | Polyoxometalates Transition metal complexes Cadmium Crystal structure Hydrothemal synthesis |
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