262
KRASIL’NIKOV
Table 3. Wavenumbers (cm–1) of absorption peaks in the IR spectrum of K2VO(SO4)2 · H2O
Vibrations of SO24– ion
V–O vibrations
H2O vibrations
ν1
ν2
ν3
ν4
ν
δ
1010 vs
448 w
1249 vs
1225 vs
1210 vs
1140 vs
1119 vs
1050 vs
1026 vs
684 s
621 m
598 s
994 vs
972 vs
ν(V=O)
ν(V–O)
3450 s
3300 m
3180 m
1620 s
510 m
K2VO(SO4)2 · H2O are the following: 6.841 (10), IR spectrum of K2VO(SO4)2 · H2O implies that the
6.042 (15), 5.265 (35), 4.552 (15), 4.144 (20), 3.811 water molecules in the crystal structure are not coordi-
(5), 3.584 (15), 3.515 (20), 3.435 (20), 3.351 (60), nated to vanadium atoms; rather, they are in interlayer
3.295 (30), 3.085 (20), 2.988 (20), 2.931 (100), 2.876 spaces.
(75), 2.782 (20), 2.647 (20), 2.588 (15), 2.533 (15),
2.278 (20), 2.154 (15), 2.112 (25), 2.073 (15), 1.901
(10), 1.760(10). Powdered VOSO4 · 3H2O is also bright
REFERENCES
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blue. When viewed under a microscope, the crystals
and their chips have a well-defined isometric shape;
short prisms and elongated platelets are less frequent.
The refractive indices are Ng = 1.574 (greenish-yel-
low), Nm = 1.560 (light blue), and Np = 1.542 (bright
blue). Colorless KHSO4 crystals usually have no cleav-
age. The refractive indices are Ng = 1.491, Nm = 1.460,
and Np = 1.445. Potassium hydrosulfate crystals are
very easy to distinguish against the background of col-
ored vanadium compounds.
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the set of bands that indicates the bidentate coordina-
tion of the sulfato groups to the vanadium atoms (Table 3).
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antisymmetrical bending vibrations ν4(SO4), there are
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three quite strong bands: 684, 621, and 598 cm–1. The
symmetrical stretching vibrations ν1(SO4) and bending
vibrations ν2(SO4) appear as a strong narrow band at
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the vibrations of ordinary bands. The stretching vibra-
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(3450, 3300, and 3180 cm–1); their intensity decreases
with decreasing wavenumber. The bending vibrations
δ(H2O) are characterized by a strong narrow band at
14. K. Nakamoto, Infrared Spectra of Inorganic and Coor-
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Moscow, 1966).
1620 cm–1. The nonappearance of the bands due to the
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rocking and wagging vibrations ρ(H2O) [14, 15] in the
(Nauka i Tekhnika, Minsk, 1985) [in Russian].
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY Vol. 52 No. 2 2007