| Two series of polyoxometalates based on Lindqvist polyanions or Dawson polyanions were successfully synthesized in virtue of transition-metal complexes by the ambient-temperature aqueous solution and hydrothermal technique, which were characterized by X-ray crystallograpy, IR, UV spectra, thermal, luminescent properties and magnetic properties.1. Three novel polyoxoniobates [Cu(en)2]2{[Cu(1,10-phen)][Cu(1,10-phen)(H2O)] Nb6O19}·10.5H2O (1), [Cu(en)2]2{[Cu(2,2′-bipy)][Cu(2,2′-bipy)(H2O)]Nb6O19}·9H2O (2) and [Cu(1,2-dap)2]2{[Cu(2,2′-bipy)][Cu(2,2′-bipy)(H2O)]Nb6O19}·11H2O (3) have been synthesized, which represent the first examples hexaniobates containing aliphatic and aromatic N-ligands. In addition, 1–3 show rare 2-D layer structure and (4,4)-topological network.2. A new polyoxoniobates K3NaH4Nb6O19·11H2O (4) has been isolated, compound 4 possesses a 3-D extended structure composed of [H4Nb6O19]4– as building blocks and K–O and Na–O bridges.3. A 2-D compound with saturated Dawson-type polyanion [Cu2IIL2(H2O)2][Cu2IIL2 (H2O)][CuIIL]2[P2W18O62]·H2O (5) has been synthesized by hydrothermal method, in which the [P2W18O62]6– polyanions are connected by three di-copper clusters.4. A 1-D chain compound [Mn(2,2?-bipy)3]H2[Mn(2,2?-bipy)2][P2W18O62] (6) and two 0-D compounds [Co(H2biim)3)]2H2[P2W18O62]·8H2O (7)和[Cu(H2biim)2]2H2 P2W18O62·2C2H5OH·2H2O (8) have been isolated, which are all constructed by Dawson-type cluster [P2W18O62]6–. |
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