The course of the replacement of ethanol by water molecules in comparison with the decrease in the amount of starting material can be explained by the existence of non-diffracting in the VOPO 4 •2C 2 H 5 OH intercalate, and of water by ethanol in VOPO 4 •2H 2 O has been studied by X-ray diffraction and advancing phase boundary. In a VOPO 4 /ethanol/water system, VOPO 4 •2C 2 H 5 OH is formed as the only product infrared and Raman spectroscopy. Formation of mixed phase VOPO 4 •C 2 H 5 OH•H 2 O was not observed. The shape of the when the system contained more than 96 vol% of ethanol, whereas in the system with less than 94 vol% of ethanol only kinetics curves indicates a transition of at least one reaction zone through the crystal. A delay in formation of the product VOPO 4 •2H 2 O is present.
hydrous form under ambient conditions. Instead, the [a] Joint Laboratory of Solid State Chemistry of the Academy of VOPO 4 layers to complete the vanadium octahedra and Sciences of the Czech Republic and University of Pardubice, Studentska ´84, 532 10 Pardubice, Czech Republic their orientation is not very strictly defined. The second half Fax: (internat.) ϩ 420-40/6036011 of the ethanol molecules are linked by hydrogen bonds to