Synthesis,Spectroscopic Properties and Structural Characterization of Sodium Potassium Citrato Oxotungstate(VI)Dimer

作     者：WANG Geng ZHOU Zhao-Hui ZHANG Hui YE Jian-Liang WAN Hui-Lin 

作者机构：Department of Chemistry and State Key Laboratory for Physical Chemistry of Solid SurfaceXiamen UniversityXiamen361005 

出 版 物：《Chinese Journal of Structural Chemistry》 (结构化学（英文）)

年 卷 期：2000年第19卷第3期

页      面：181-186页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：ThisprojectissupportedbytheNationalNaturalScienceFoundationofChina! (2 99330 40 ) theScienceandResearchFoundationofXiamenUni 

主　　题：oxotungstate(VI) citrate citric acid citrate method crystal structure 

摘      要：The sodium potassium citrato oxotungstate(VI) dimer, Na 4K 2〔W 2O 5\|(cit) 2〕·11H 2O (H 4cit = citric acid) was obtained by the reaction of sodium tungstate(VI) and excess potassium citrate monobasic (KH 3cit) in neutral solution. The crystal data for the title compound: monoclinic, C 12 H 30 K 2Na 4W 2O 30 , M r =1192.21, space group P2 1/n, a=17.427(4), b=10.022(2), c=18.637(3) , β=92.62(1)°, V=3252(2)  3, Z=4, D c =2.435 g/cm 3, μ( Mo Kα )=76.38 cm -1 , F( 000)=2288. The structure was refined to R =0.0434 for 6327 independent observed reflections with I3σ(I) . The complex anion contains a quasi centrosymmetric (O 2W)O b(WO 2) core with a bent bridging oxo group 〔W-O b-W 175.0(4)°〕. Each citrate as tridentate ligand coordinates to a tungsten atom through the alkoxy, α carboxyl, and one β carboxyl group, while the other β carboxyl group remains uncoordinated. Principal dimensions are: W-O b 1.883(6) , (W=O t)av 1.715(6) , W-O (alkoxy) 1.959(6) , W-O ( α carboxy) 2.176(6)  and W-O ( β carboxy) 2.231(6) . The tungsten atom is located in a distorted octahedron environment.