Zur Kenntnis von Berylliumiodat und -periodat-Röntgenographische, IR- und Raman-spektroskopische Untersuchungen / On Beryllium Iodates and Periodates - X-Ray, IR, and Raman Studies

Abstract

Phase relationships and therm al decomposition of beryllium iodates and periodates were studied by X-ray and spectroscopic (IR, Ram an) measurements. B e(I03)2-4 H 20 , B e(I03)2, and Be(H4I 0 6)2-4 H 20 have been characterized. Be(H4I 0 6)2-4 H 20 (hitherto claimed in the lit erature to be a metaperiodate) dehydrates on heating with decomposition to form B e(I03)2. Anhydrous beryllium periodate was not obtained. On dehydration of B e(I0 3)2-4 H 20 , an hydrous B e(I03)2 is formed, which decomposes into BeO, I2, and 0 2 on further heating.

Diffuse Reflection Infrared Fourier Transform (DRIFT) Spectra and High-Temperature DRIFT Spectra of β—Ni(IO3)2·4H2O, Ni(IO3)2·2H2O, Mg(OH)2, and Zn(OH)F: Novel Embedding Materials

“…This especially applies if there are chemical reactions of the compound studied with common matrix materials or KBr plates as, for example, in the case of the hydrates of orthoperiodates. 10,25 H igh- 8) clearly reveal the decomposition of this compound to anhydrous nickel iodate at elevated temperatures, as already established with DSC (differential scanning calo-rimetry) and high-temperature Raman spectroscopic experiments. 7 This is shown by the disappearance of the OH stretching and bending m odes at 3413 and 3267 cm 2 1 , and 1657 cm 2 1 , respectively.…”

The First Beryllium Periodate: Be(H4IO6)2.4H2O

“…This was indicated by IR experiments, but resulted from the strong reaction with KBr used as the matrix. Raman spectroscopic and more careful IR experiments, however, revealed that the compound under study was an orthoperiodate, Be(H4IO6)2.4H20, rather than a metaperiodate (Maneva, Georgiev, Lange & Lutz, 1991). This has been confirmed by the single-crystal X-ray studies reported in this work.…”

Thermal dehydration of the double salts K2Be(XO4)2·2H2O (X = S, Se)

“…The present paper continues our investigations on the structures and properties of beryllium salts [1][2][3][4][5][6][7][8]. The interest in the beryllium compounds is determined by their promising physical properties.…”