US EPA

1444289 

Journal Article 

IR-SPECTRA OF NISO4.NH2O (N = 7,6,4,1,0) AND OF THEIR DEUTERATED ANALOGS 

Maneva, M; Rizova, D; Genov, L 

1992 

1 

Spectroscopy Letters
ISSN: 0038-7010
EISSN: 1532-2289 

25 

4 

603-615 

10.1080/00387019208021535 

WOS:A1992JE34400016 

IR spectra were taken of NiSO4.nH2O (n = 7,6,4,1,0) and of
the fully and partially deuterated analogues of theirs in the region of 4000 cm-1 to 300 cm-1 in
tablets of KBr, in Nujol in the region of 4000 cm-1 to 500 cm-1, and in suspension of 1,3-
hexachlorobutadiene from 4000 to 1000 cm-1 . They were interpreted in relation to the stretching
and bending vibrations of the hydrate water, its symmetry, the types of H bonds in which it
participates (H2O - - - H - O - H - - - OSO3 and H2O - - H - O - H - - - OH2) and their energy.
The latter, calculated from spectroscopic data, varies within the interval of 32 - 22 kJ/mol for
NiSO4.nH2O (n = 7,6.4) and is 38.9 kJ/mol for NiSO4.H2O. Correlation has been established between
the E of the H bond and d(Ni <-- O). The librational vibrations were characterized mainly by the
respective composite vibrations (nu(L) + delta(H2O)). The symmetry of the SO4 group has been
examined and compared in the various hydrates, as well as its bidentate coordination in the
monohydrate. 

NICKEL SULFATES; IR-SPECTRA