748
DAVIDOVICH et al.
bridging Zr−F–Zr bonds in the IR spectrum of
(GlyH)ZrF5 · 2H2O. This band is the most intense band
of the stretching vibrations of the Zr–F bonds in the
spectrum. A significant increase of the frequency of the
stretching vibrations of the bridging Zr–F–Zr bonds
(395 cm–1) is observed compared to the analogous fre-
quency (361 cm–1) in the IR spectrum of (GlyH)2ZrF6
(Table 4). In the Raman spectrum of (GlyH)ZrF5 ·
2H2O, the stretching vibration of the bridging Zr−F−Zr
bonds appear as a broad middle-intensity band with two
peaks at 386 and 360 cm–1. In this case, the band at
360 cm–1 is more intense than that at 386 cm–1. The IR
and Raman spectroscopic data allowed us to conclude
that (GlyH)ZrF5 · 2H2O has a polynuclear structure,
where there must be more bridging Zr–F–Zr bonds than
terminal Zr–F bonds. According to the X-ray diffrac-
tion data, the complex anions in (GlyH)ZrF5 · 2H2O
possess a polynuclear layered structure. In a polymeric
layer, the zirconium polyhedra (ZrF8) are bound
through three common F–F edges. Thus, in each Zr
polyhedron of the crystal structure of (GlyH)ZrF5 ·
2H2O, there are two terminal fluorine atoms for six
bridging fluorine atoms.
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ACKNOWLEDGMENTS
24. R. L. Davidovich, T. A. Kaidalova, T. F. Levchishina,
and V. I. Sergienko, Atlas of Infrared Absorption Spectra
and X-ray Diffraction Data for Complex Group IV and V
Metal Fluorides (Nauka, Moscow, 1972) [in Russian].
The authors are grateful to A.A. Mashkovskii for
recording the IR spectra and V.I. Kostin for recording
the Raman spectra.
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY Vol. 52 No. 5 2007