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Vibrational spectra of α‐CaNa 2 P 2 O 7 · 4H 2 O, CaNH 4 NaP 2 O 7 · 3H 2 O and CdNH 4 NaP 2 O 7 · 3H 2 O
Author(s) -
Joe I. Hubert,
Aruldhas G.,
Keresztury Gabor
Publication year - 1991
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250220913
Subject(s) - raman spectroscopy , chemistry , ion , nap , analytical chemistry (journal) , crystallography , spectral line , physics , organic chemistry , astronomy , chromatography , neuroscience , optics , biology
The IR and Raman spectra of polycrystalline samples of α‐CaNa 2 P 2 O 7 · 4H 2 O, CaNH 4 NaP 2 O 7 · 3H 2 O and CdNH 4 NaP 2 O 7 · 3H 2 O were recorded and analysed. Vibrational bands due to NH 4 + , P 2 O 7 4− and H 2 O are identified. The POP bridge angle is found to be about 129° and the pyrophosphate ion is non‐centrosymmetric. The NH 4 + ion is likely to be rotating freely in the componds XNH 4 NaP 2 O 7 · 3H 2 O (X = Ca, Cd).