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Fermi resonance in Raman and infrared spectra of Ni(CH 3 COO) 2 ·4H 2 O and its deuterated analogue
Author(s) -
Raghuvanshi G. S.,
Pal Mahendra,
Bist H. D.
Publication year - 1983
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.1250140102
Subject(s) - fermi resonance , raman spectroscopy , chemistry , hypsochromic shift , hydrate , anharmonicity , crystallography , infrared , resonance (particle physics) , deuterium , phonon , infrared spectroscopy , analytical chemistry (journal) , nuclear magnetic resonance , atomic physics , condensed matter physics , physics , optics , organic chemistry , fluorescence , chromatography
The doublet at 962–906 cm −1 observed in the room temperature spectra of Ni(CH 3 COO) 2 . 4H 2 O is attributed to the ν 4 state of the acetate group undergoing strong Fermi‐type anharmonic interaction with a two‐phonon hybrid state associated with a water libration exhibiting characteristic hypsochromic shift and hyperchromic effect with decreasing temperature. In the deuterated analogue another doublet at 706–666 cm −1 is associated with the v 5 state of the acetate group and another two‐phonon hybrid state, also associated with a D 2 O libration, exhibiting hypsochromic shift but the hypochromic effect. The Fermi interaction enhances in the hydrate and diminishes in the deuterate as the temperature is lowered.