Journal of the American Chemical Society p. 8123 - 8128 (1984)
Update date:2022-08-29
Topics:
Johnson
Johnston
Jacobson
Brody
Vanadyl hydrogen phosphate hemihydrate, VO(HPO//4) multiplied by (times) 0. 5H//2O, has been characterized through a combination of techniques including infrared spectroscopy, paper chromatography, X-ray powder diffraction, scanning electron microscopy, thermogravimetric analysis and magnetic susceptibility measurements. It crystallizes in the orthorhombic system, a equals 7. 434 (2) A, b equals 9. 620 (2) A, c equals 5. 699 (1) A in space group Pmmn or P2//1mn. The structure consists of two-dimensional layers of HPO//4**2** minus anions and pairs of antiferromagnetically coupled V**4** plus cations. The layers are held together by strong hydrogen bonding. Above approximately 350 degree C, VO(HPO//4) multiplied by (times) 0. 5H//2O undergoes a topotactic dehydration to (VO)//2P//2O//7, an active and selective catalyst for the oxidation of butane to maleic anhydride.
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