High-temperature Raman spectroscopic studies on nickel iodates

Pracht, G.; Lange, N.; Lutz, H. D.

doi:10.1016/s0040-6031(97)00013-0

Cited by 21 publications

(17 citation statements)

References 21 publications

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“…The calculated intensities of the water bands given in Table 2 are based on the elements of the derived molecular polarizability tensor reported by Avila et al 32 In the case of isotopically dilute samples (10% D), two uncoupled OD stretches of matrix-isolated HDO molecules are recorded in the infrared experiment. 26,27 This is confirmed by the Raman experiments (see Figs 4 and 6 and Table 5). Two bands of almost equal intensity are observed in (xx), (yy) and (xy) measuring geometries (see Fig.…”

Section: Hydrate H 2 O Molecules Hydrogen Bondssupporting

confidence: 59%

“…We therefore assume the band at 3333 cm 1 is caused by Fermi resonance (see the discussion in Ref. 27). …”

Section: Hydrate H 2 O Molecules Hydrogen Bondsmentioning

confidence: 99%

“…26,27 In the Raman experiment on polycrystalline samples three bands are observed in this region, viz. a very strong band at 773 cm 1 , a medium band at 740 with a shoulder at 746 cm 1 and a very weak band at 800 cm 1 (see Fig.…”

Section: Iodate Ions Io Stretching and Bending Vibrationsmentioning

confidence: 99%

“…1) are available from both X-ray and neutron diffraction structure determinations. 22,24,25 Infrared and Raman spectra of polycrystalline samples of the title compound 26,27 resemble those of other solid iodates with IO 3 site symmetries <C 3v , viz. displaying an apparently very strong symmetric IO stretching mode 1 and two asymmetric modes 3a and 3b with the order 3a > 1 > 3b .…”

Section: Introductionmentioning

confidence: 99%

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Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO₃)₂·2H₂O

Schellenschläger¹,

Pracht²,

Lutz³

2001

J Raman Spectroscopy

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Single-crystal Raman spectra in the range 4000-35 cm −1 and the results of group theoretical treatment including Cartesian symmetry coordinates of nickel iodate dihydrate, Ni.IO 3 / 2 · 2H 2 O, (space group Pbca, Z = 4) are presented and discussed with respect to the strength of the HO -H· · ·OIO 3 hydrogen bonds and the extent of intramolecular (intraionic) coupling of the stretching vibrations of both the hydrate H 2 O molecules and the iodate IO 3 − ions. The energies and relative intensities of the IO stretching modes in the various species of the unit-cell group D 2h reveal that the iodate ions of the title compound behave as if they possess pseudo C 2v site symmetry with a at least partly uncoupled IO stretch due to the significantly shortest (175.5 pm) IO arm and a symmetric (n s ) and an antisymmetric stretching vibration (n as ) due to the remaining IO 2 group (r I -O = 184.2 and 186.0 pm). The respective site-group modes decrease in the order n 3a $ n IO.1/ (mean value of the respective unit-cell group modes: 804 cm −1 / > n 1 $ n s (772 cm −1 / > n 3b $ n as (744 cm −1 ) (n 1 and n 3 as for distorted C 3v IO 3 − ions). For the IO 3 − bending modes (430-300 cm −1 ) and the lattice modes below 300 cm −1 the true vibrational modes are not known. The normally used assignment to a symmetric (n 2 ) and an asymmetric bending vibration (n 4 ) as for C 3v IO 3 − ions is at least questionable.The hydrogen-bond distances calculated from the wavenumbers of the OD stretching modes of matrixisolated HDO molecules do not fully agree with the data of a neutron diffraction study performed in 1972.

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Section: Hydrate H 2 O Molecules Hydrogen Bondssupporting

confidence: 59%

“…We therefore assume the band at 3333 cm 1 is caused by Fermi resonance (see the discussion in Ref. 27). …”

Section: Hydrate H 2 O Molecules Hydrogen Bondsmentioning

confidence: 99%

Section: Iodate Ions Io Stretching and Bending Vibrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO₃)₂·2H₂O

Schellenschläger¹,

Pracht²,

Lutz³

2001

J Raman Spectroscopy

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“…[22,23] Iodate stretching vibrations (ν 1 and ν 3 ) are found at 822, 803, 778, 765, 741, and 664 cm -1 . [24][25][26] The Raman spectrum shows a broad peak centered at 508 cm -1 that coincides well with the IR features. In addition, there is a broad envelope for the various iodate modes with discernible vibrational modes at 860, 821, 773, and 741 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

Square‐Planar Noble Metal Iodate [M(IO₃)₄]ⁿ^– (M = Pd^II, Au^III; n = 2, 1) Anions and Their Ability to Form Polar and Centrosymmetric Architectures

Ling

Albrecht‐Schmitt

2007

Eur J Inorg Chem

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Thermo‐Raman spectroscopic study of the uranium mineral sabugalite

Frost

Weier

Martens

et al. 2005

J Raman Spectroscopy

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The changes in the structure of sabugalite were investigated using thermo-Raman and infrared spectroscopy based on the results of thermogravimetric analysis. Two Raman bands are observed at 835 and 830 cm −1 assigned to the (UO 2 ) 2+ stretching vibrations resulting from the non-equivalence of the uranyl bonds (UO 2 ) 2+ . These bands give calculated U-O bond lengths of 1.773 and 1.780Å. A low-intensity band is observed at 895 cm −1 assigned to the n 3 antisymmetric stretching vibration of (UO 2 ) 2+ units. Five bands are observed in the 950-1050 cm −1 region in the Raman spectrum of sabugalite and are assigned to the n 3 antisymmetric stretching vibration of (PO 4 ) 3− units. Changes in the Raman spectra reflect changes in the structure of sabugalite as dehydration occurs. No (PO 4 ) 3− symmetric stretching mode is observed. This result is attributed to the non-equivalence of the PO bonds in the PO 4 units. The PO 4 vibrations were not affected by dehydration. Thermo-Raman spectroscopy proved to be a very powerful technique for the study of the changes in the structure of sabugalite during dehydration.

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High-temperature Raman spectroscopic studies on nickel iodates

Cited by 21 publications

References 21 publications

Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO₃)₂·2H₂O

Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO₃)₂·2H₂O

Square‐Planar Noble Metal Iodate [M(IO₃)₄]ⁿ^– (M = Pd^II, Au^III; n = 2, 1) Anions and Their Ability to Form Polar and Centrosymmetric Architectures

Thermo‐Raman spectroscopic study of the uranium mineral sabugalite

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High-temperature Raman spectroscopic studies on nickel iodates

Cited by 21 publications

References 21 publications

Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO3)2·2H2O

Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO3)2·2H2O

Square‐Planar Noble Metal Iodate [M(IO3)4]n– (M = PdII, AuIII; n = 2, 1) Anions and Their Ability to Form Polar and Centrosymmetric Architectures

Thermo‐Raman spectroscopic study of the uranium mineral sabugalite

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Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO₃)₂·2H₂O

Single‐crystal Raman studies on nickel iodate dihydrate, Ni(IO₃)₂·2H₂O

Square‐Planar Noble Metal Iodate [M(IO₃)₄]ⁿ^– (M = Pd^II, Au^III; n = 2, 1) Anions and Their Ability to Form Polar and Centrosymmetric Architectures