Study of acid pyridine-3-carboxylic acid dodecatungstenphosphate of the composition (C6NO2H5)(2)H[PW12O40]center dot 2H(2)O

作者：Kaziev G Z^*; Kirichenko O A; Stash A I; Quinones Saul H; Solov'eva E A; Chen Y S

来源：Journal of Structural Chemistry, 2014, 55(4): 674-681.

DOI：10.1134/S002247661404012X

• heteropolycompounds
• X-ray crystallography
• physicochemical properties

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.

• 出版日期2014-7