Raman and infrared spectra of crystalline [UO 2 (NH 2 O) 2 (H 2 O) 2 ]·H 2 O

Raman spectra of a single crystal were recorded at 292 K in addition to spectra at 292 and 17 K of undeuterated and partly deuterated powder. Infrared spectra of these compounds in KBr discs were recorded in the temperature range 17–360 K. Furthermore far infrared spectra of the undeuterated and partly deuterated compound in nujol mulls were recorded at 292 and 85 K. The stretch frequencies of the uranyl group which in this compound appears to be linear and symmetric, were observed at extremly low values, viz. ν s at 783 cm −1 (R) and ν as at c. 850 cm −1 (i.r.). The spectroscopic evidence confirmed the strong degree of hydrogen bonding which involves the uranyl group and all hydrogen atoms, even those of the hydroxylamino group. A small but complete correlation field splitting was observed especially in the case of the ν s (NO) vibration at 919 ( B 1 g ), 921 ( A g ), 923 ( B 2 g ) and 925 cm −1 ( B 3 g ) in agreement with the predictions of a factor‐group analysis.