Infrared and polarized Raman spectra of M{sub 6}[TeMo{sub 6}O{sub 24}]{center_dot}7H{sub 2}O[M = K, NH{sub 4}] and (NH{sub 4}){sub 6}[TeMo{sub 6}O{sub 24}]{center_dot}Te(OH){sub 6}{center_dot}7H{sub 2}O single crystals
- Univ. of Kerala, Trivandrum (India)
Heteropolymolybdates are widely used as industrial catalysts, ion exchange agents, corrosion inhibitors, and solid state electrolytes for fuel cells. The infrared (IR) and polarized Raman spectra of K{sub 6}[TeMo{sub 6}O{sub 24}]{center_dot}7H{sub 2}O, (NH{sub 4}){sub 6}[TeMo{sub 6}O{sub 24}]{center_dot}7H{sub 2}O, and (NH{sub 4}){sub 6}[TeMo{sub 6}O{sub 24}]{center_dot}Te(OH){sub 6}{center_dot}7H{sub 2}O single crystals have been recorded and analyzed. The Te-O vibrations and the bridging and terminal Mo-O vibrations observed in the IR and Raman spectra confirm a finite [TeMo{sub 6}O{sub 24}]{sup 6-} heteropolyanion in all the three crystals. TeO{sub 6} octahedra are considerably distorted in NTMH1 and NTMH2 crystals, while the distortion is less in KTMH. The NH{sub 4}{sup +} ion does not rotate freely in the crystalline lattice and the N-H{center_dot}{center_dot}{center_dot}O bonds form an asymmetric potential in both ammonium-containing crystals. Stretching and bending vibrations of water molecules show hydrogen bonds of various strengths in all three crystals. Two crystallographically distinct water molecules are identified in KTMH crystal.
- OSTI ID:
- 210086
- Journal Information:
- Journal of Solid State Chemistry, Vol. 118, Issue 2; Other Information: PBD: Sep 1995
- Country of Publication:
- United States
- Language:
- English
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