Citation:
ZHAO Jun-Wei, WANG Jing-Ping, NIU Jing-Yang. Synthesis and Crystal Structure of a B-Anderson-type Polyoxometalate [Co(2,2-'bipy)3]H-[Al(OH)6(Mo6O18)]·5H2O[J]. Chinese Journal of Applied Chemistry,
;2006, 23(3): 289-293.
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A B-Anderson-type polyoxometalate[Co(2,2-'bipy)3]H-[Al(OH)6(Mo6O18)]·5H2O has been synthesized from AlCl3·H2O,Na2MoO4·2H2O,CoCl2·6H2O and 2,2'-bipydine and characterized by means of IR,UV spectra,thermogravimetric analysis and Xray diffraction.The X-ray crystallography indicates that the title compound crystallizes in a triclinic lattice,P1 space group,with a=1.216 0(2),b=1.221 5(2),c=1.780 0(4) nm,α=86.83(3)°,β=88.76(3)°, γ=89.82(3)°,V=2.639 4(9) nm3,Z=2,R1=0.079 4,wR2=0.176 6.Structural analysis reveals that the molecule of the title compound is composed of one[Co(2,2'-bipy)3]2+coordination cation,one H+ ion,two crystallographically independent "one-half" polyoxoanions[Al(OH)6(Mo6O18)]3- and five hydration water molecules.Under the participation of water and coordinated metal ions,the[Al(OH)6(Mo6O18)]3- polyoxoanions form a two-dimensional network structure by means of supramolecular interaction.The adjacent network structures interact with each other,generating a three-dimensional structure infinitely extended via supramolecular interaction.Thermogravimetric analysis elucidates that the process of weight loss of the title compound is divided into two stages and also reveals that the backbone of heteropolyoxoanion decomposes at 547.5℃.
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