Vibrational spectra of NH{sub 4}Sm(SO{sub 4}){sub 2} {center_dot} 4H{sub 2}O and NH{sub 4}Ln(SO{sub 4}){sub 2} {center_dot} 2H{sub 2}O [Ln = Yb, Tm]
- Univ. of Kerala, Thiruvananthapuram (India); and others
The IR and Raman spectra of a single crystal NH{sub 4}Sm(SO{sub 4}){sub 2} {center_dot} 4H{sub 2}O and that of two polycrystalline compounds NH{sub 4}Ln(SO{sub 4}){sub 2} {center_dot} 2H{sub 2}O [Ln = Yb, Tm] have been recorded and analyzed. Two types of SO{sub 4} groups predicted by the X-ray data of the samarium compound are not observed in the present study. However, the bands show two crystallographically distinct SO{sub 4}{sup 2-} ions in the other two compounds. The absence of free rotation and broadness of the bands in the internal mode region confirms that NH{sub 4}{sup +} ions form hydrogen bonds in the crystals under study. The observed stretching and bending bands show the presence of three distinct types of water molecules in NH{sub 4}Sm(SO{sub 4}){sub 2} {center_dot} 4H{sub 2}O. The water molecules form hydrogen bonds of medium strength in all three crystals.
- OSTI ID:
- 223737
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 121; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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