Hydrothermal syntheses, characterizations and crystal structures of 1-D and 2-D arsenotungstates based on Dawson-type units

作者：Wang Jingping; Wang Wei; Niu Jingyang^*

来源：Journal of Molecular Structure, 2008, 875(1-3): 68-74.

DOI：10.1016/j.molstruc.2007.04.009

• polyoxometalates
• hydrothermal synthesis
• dawson blocks
• arsenotungstates

Two arsenotungstates based on Dawson polyanions, 1-D chain H-8[{Cu-I(en)(2))(4){Cu-I(2,2'-bipy)((HO)-O-2)}(Cu-I(2,2'-bipy) (As2W17CuO61)}(2)]center dot 4H(2)O (1) and 2-D network [Cu(2,2'-bipy)(3)](2) [(As(2)Wi(8)O(62))Na-4(H2O)(11)](2)center dot 7H(2)O (2) (2,2'-bipy=2,2'-bipyridine), have been hydrothermally synthesized and characterized by elemental analyses, IR, ESR, TG-DTA and single-crystal X-ray diffraction. Compound I crystallizes in triclinic system, space group P-1, a = 11.640(3), b = 13.177(3), c = 31.143(7) angstrom, alpha = 87.43(0)degrees, beta = 84.47(0)degrees, = 68.02(0)degrees. Compound 2 crystallizes in hexagonal system, space group P-6 2c, with a = 12.9175(7), c = 28.371(3) A. The structure of 1 represents the first 1-D chain consisted of oxo-bridged Wells-Dawson arsenotungstate anions. The compound 2 is the first 2-D sodium arsenotungstate, whose building units [(As2W18O62)(H2O)(8)Na-2](4-) were connected to neighboring units via [Na-2(H2O)(3)](2+) bridging groups.

• 出版日期2008-3-17
• 单位河南大学