Low Temperature Infrared and Raman Spectra of Lithium Borohydride

1971 ◽  
Vol 49 (20) ◽  
pp. 3282-3286 ◽  
Author(s):  
K. B. Harvey ◽  
N. R. McQuaker
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Lattice Vibrations ◽  
Infrared And Raman Spectra ◽  
Lithium Borohydride ◽  
Librational Mode

The infrared spectra of polycrystalline LiBH4 and LiBD4 have been recorded in the region 4000–50 cm−1 at 80 °K. Raman spectra of polycrystalline samples were also recorded at this temperature. The spectra of the [Formula: see text]and [Formula: see text]lattice vibrations are consistent with symmetrically equivalent borohydride ions which lie on either general positions, two-fold axes or mirror-planes. Six lattice vibrations of translatory origin appear in the infrared spectrum of LiBH4 and a mode of libratory origin is inferred from an absorption tentatively assigned as a second overtone of a librational mode. Similar spectral results are obtained for LiBD4. The inferred librational frequencies are 418 cm–1 for the [Formula: see text] ions and 319 cm–1 for the [Formula: see text] ions.

Infrared and Raman Spectra of Spiropentane-H8

1972 ◽  
Vol 26 (5) ◽  
pp. 540-542 ◽  
Author(s):  
G. R. Burns ◽  
D. G. McGavin
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Gas Phase ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Sufficient Information ◽  
Infrared And Raman Spectra ◽  
Calorimetric Data ◽  
Crystalline Films ◽  
Twist Mode

Infrared and Raman spectra have been measured for spiropentane-H8. Raman spectra for the liquid have enabled the b1 species ring twist to be assigned. Previous assignments of this mode were based on calorimetric data and on the assignment of a band in the infrared spectrum to a combination band involving the ring twist mode. Infrared spectra of low temperature crystalline films have provided sufficient information that, when taken with the Raman data and gas phase infrared spectra, we have assignments for all of the fundamental modes.

Low-Temperature Infrared and Raman Spectra of Co(CH3COO)2·4X2O (X = H, D)

1984 ◽  
Vol 38 (5) ◽  
pp. 710-714 ◽  
Author(s):  
G. S. Raghuvanshi ◽  
D. P. Khandelwal ◽  
H. D. Bist
Keyword(s):  
Low Temperature ◽  
Raman Spectra ◽  
Water Analysis ◽  
Infrared Spectra ◽  
Unit Cell ◽  
Infrared And Raman Spectra

The infrared spectra (4000–200 cm−1) at 300 K and 95 K, and Raman spectra (4000–40 cm−1) at 300 K and 130 K of the titled compounds are reported A varying degree of deuteration has been used to assign the modes of water Analysis of the spectra confirms the known structure that has one type of acetate ion and two types of water groups in the unit cell H2O(I) retains approximately C2 v symmetry while H2O(II) is distorted to C s

Far-Infrared and Raman Spectra of Ammonium Fluoride and Ammonium Fluoride—d4

1970 ◽  
Vol 24 (1) ◽  
pp. 16-20 ◽  
Author(s):  
J. R. Durig ◽  
D. J. Antion
Keyword(s):  
Thin Films ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Ammonium Fluoride ◽  
Isotopic Shift ◽  
Lattice Vibrations ◽  
Infrared And Raman Spectra ◽  
Far Infrared Spectra

The far-infrared spectra of thin films of NH4F and ND4F and the Raman spectra of polycrystalline samples of both compounds have been recorded at −170°C. Two low-frequency lattice vibrations were observed in each spectrum and these have been assigned as optical translations on the basis of their isotopic shift factors. Librational modes were not observed in any of the spectra.

Infrared and Raman Spectra of Potassium and Sodium Borohydride

1971 ◽  
Vol 49 (20) ◽  
pp. 3272-3281 ◽  
Author(s):  
K. B. Harvey ◽  
N. R. McQuaker
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Raman Spectra ◽  
Sodium Borohydride ◽  
Vibrational Spectra ◽  
Phase Changes ◽  
Lattice Vibrations ◽  
Infrared And Raman Spectra ◽  
Laser Raman ◽  
Potassium Borohydride

Using both infrared and laser Raman techniques the low temperature vibrational spectra of KBH4, KBD4, NaBH4, and NaBD4 have been recorded. The spectra of the external lattice vibrations are consistent with the following borohydride ion site symmetries: Td for potassium borohydride and D2d for sodium borohydride. Translational frequencies are assigned and librational frequencies are inferred from absorptions tentatively assigned as second overtones. Comparison of the low and high temperature vibrational spectra suggests the following disorder–order phase changes: Oh5 → Td2 for potassium borohydride and Oh5 → D2d9 for sodium borohydride.

Normal Coordinate Analysis of Benitoite (BaTiSi3O9) and its Constituent Ring

1992 ◽  
Vol 291 ◽  
Author(s):  
Charles C. Kim ◽  
M. I. Bell ◽  
D. A. McKeown
Keyword(s):  
Crystal Structure ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Normal Modes ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Structure Space ◽  
New Information ◽  
Atomic Interactions ◽  
Modes Of Vibration

ABSTRACTThe normal modes of vibration and their frequencies are calculated for benitoite, a mineral whose crystal structure (space group D23h) consists of three-membered silicate rings (Si3O9) linked by Ba+2 and Ti+4 ions. The calculation unambiguously assigns the normal modes to the lines in the Raman and infrared spectra and determines the atomic interactions. On the assumption that mode mixings and splittings due to inter-ring interactions are small, the normal frequencies of the isolated ring of C3h, symmetry are determined. The identification of normal modes characteristic of three-membered silicate rings may prove to be a valuable guide in the interpretation of the infrared and Raman spectra of amorphous silicates, potentially leading to new information on the ring statistics of these materials.

FAR INFRARED AND RAMAN SPECTRA AND STRUCTURE OF DITHIOPHOSGENE

1964 ◽  
Vol 42 (9) ◽  
pp. 2107-2112 ◽  
Author(s):  
W. K. Busfield ◽  
M. J. Taylor ◽  
E. Whalley
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Raman Spectra ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Tentative Assignment

The infrared spectrum in the range 3000–50 cm−1 and the Raman spectrum of solutions of dithiophosgene have been obtained. There are no coincidences in the infrared and Raman spectra, and the only structure consistent with this and approximately tetrahedral carbon valencies is[Formula: see text]that is tetrachloro-1,3-dithietane, in which the ring is planar or nearly planar. A tentative assignment of the observed bands is given on the basis of D2h symmetry.

INFRARED AND RAMAN SPECTRA OF CYANURIC FLUORIDE

1964 ◽  
Vol 42 (3) ◽  
pp. 690-695 ◽  
Author(s):  
James E. Griffiths ◽  
Donald E. Irish
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Infrared And Raman Spectra ◽  
Polarization Measurements

Infrared spectra (250–2000 cm−1) and Raman displacements (Δv = 100–1800 cm−1) with qualitative polarization measurements are reported for cyanuric fluoride. All of the active fundamentals are assigned on the basis of a planar D3h model: a1′ = 1496, 999, 642; e′ = 1617, 1424, 1087, 576, 378; a2″ = 817, 436; e″ = 743 and 226 cm−1.

THE INFRARED AND RAMAN SPECTRA OF HC(CD3)3 AND DC (CD3)3

1957 ◽  
Vol 35 (9) ◽  
pp. 969-979 ◽  
Author(s):  
J. K. Wilmshurst ◽  
H. J. Bernstein
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Infrared And Raman Spectra ◽  
Vibrational Assignment ◽  
Difference Tones ◽  
Modified Assignments ◽  
Depolarization Ratios

The Raman spectra of liquid (CD3)3CH and (CD3)3CD were obtained photoelectrically together with depolarization ratios, and the infrared spectra of the corresponding gases were obtained from 3 to 35 μ. A vibrational assignment consistent with depolarization ratios and band contours has been made for the molecules on the basis of C3v symmetry. The spectra have been correlated with the spectra of (CH3)3CH and (CH3)3CD and modified assignments for two modes have been given for these molecules. Tentative assignments have been made for the 'inactive' A2 modes (which are 'active' if the molecule has symmetry C3) to explain some of the observed frequencies around 1000 cm.−1 which could not be satisfactorily assigned as summation or difference tones.

Far-infrared and Raman Spectra of Crystalline ICN

1971 ◽  
Vol 49 (14) ◽  
pp. 2459-2462 ◽  
Author(s):  
R. Savoie ◽  
M. Pézolet
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
High Frequency ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Infrared Band ◽  
Longitudinal Modes ◽  
Intensity Measurements ◽  
Cyanogen Iodide ◽  
Far Infrared Spectra

The Raman and far-infrared spectra of crystalline cyanogen iodide have been recorded. High-frequency shoulders alongside the Raman bands confirm the piezoelectric nature of this solid and allow an estimate to be made of the frequencies of the longitudinal modes associated to the fundamental vibrations. Dipole derivatives calculated from these frequencies agree qualitatively with those obtained from infrared band intensity measurements.

Far infrared and Raman spectra of some crystalline halomercurate(II) complexes

1966 ◽  
Vol 19 (9) ◽  
pp. 1603 ◽  
Author(s):  
GB Deacon ◽  
JHS Green ◽  
W Kynaston
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Vibrational Frequencies ◽  
Infrared And Raman Spectra

The infrared spectra (500-40 cm-1) of crystalline (Me4N)2HgCl4, Me4NHgCl3, and (Et4As)2HgI4, and the Raman spectra of the first two compounds, have been recorded. Assignments of the vibrational frequencies are made and discussed in relation to the structure of the anions.

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