Study of acid pyridine-3-carboxylic acid dodecatungstenphosphate of the composition (C6NO2H5)2H[PW12O40]•2H2O

被引:1
|
作者
Kaziev, G. Z. [1 ]
Kirichenko, O. A. [1 ]
Stash, A. I. [2 ]
Quinones, Saul H. [3 ]
Solov'eva, E. A. [1 ]
Chen, Y. S. [4 ]
机构
[1] Moscow State Pedag Univ, Moscow 119435, Russia
[2] Karpov Inst Phys Chem, Moscow, Russia
[3] UAM, Ascapotzalco, Mexico
[4] Univ Chicago, Chicago, IL 60637 USA
基金
美国国家科学基金会;
关键词
heteropolycompounds; X-ray crystallography; physicochemical properties;
D O I
10.1134/S002247661404012X
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Acid pyridine-3-carboxylic acid dodecatungstenphosphate (C6NO2H5)(2)H[PW12O40]center dot 2H(2)O is synthesized. The compound is studied by chemical analysis, IR spectroscopy, X-ray crystallography, and thermogravimetry. The compound is found to crystallize at 290 K in a hexagonal crystal system (space group ) (I) with the unit cell parameters: a = 33.015(6) , c = 12.010(2) , gamma = 120A degrees, V = 11337(4) (3), Z = 9. When the temperature decreases to 100 K, a phase transition is observed leading to an increase in symmetry to (II), with the unit cell parameters: a = 33.072(1) , c = 24.234(1) , gamma = 120A degrees, V = 22955(2) (3), Z = 18.
引用
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页码:674 / 681
页数:8
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