Vibrational Spectra of N2H5HC2O4 and N2D5DC2O4

1975 ◽  
Vol 53 (9) ◽  
pp. 1387-1392 ◽  
Author(s):  
R. Savoie ◽  
M. Guay
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Low Temperature ◽  
Crystal Structures ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Unit Cell ◽  
Infrared And Raman Spectra ◽  
Solid Phases ◽  
High Temperature Modification

Infrared and Raman spectra of N2H5HC2O4 and N2D5DC2O4 have been recorded at various temperatures between 77 and 300 K. The results at 300 K are consistent with the known crystal structures of these solids. A phase transition has been detected at ∼ 240 K in N2D5DC2O4 and although there are similarities between the two stable solid phases of this compound, the low-temperature form appears to be centrosymmetric and to have a larger unit cell than the high-temperature modification.

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.

Synthesis, crystal and molecular structure, and vibrational spectra of the complex (COOH)2•2H2O•18-crown-6

1986 ◽  
Vol 64 (1) ◽  
pp. 142-147 ◽  
Author(s):  
Suzanne Deguire ◽  
François Brisse ◽  
Jacques Ouellet ◽  
Rodrigue Savoie
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bonds ◽  
Oxalic Acid ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Crystal And Molecular Structure ◽  
Unit Cell ◽  
Infrared And Raman Spectra ◽  
O 18 ◽  
Stoichiometric Complex

A stoichiometric complex of formula (COOH)2•2H2O•18-crown-6 has been obtained from oxalic acid and the macrocyclic polyether 18-crown-6. The crystals of the complex have a monoclinic unit cell and belong to the P21/c space group. The components in the adduct are linked through hydrogen bonds in a polymer-like fashion: -crown–H2O–HOOCCOOH–OH2–crown–, where the oxalic acid molecules are present in two distinct disordered orientations. The infrared and Raman spectra of the complex are also reported and interpreted.

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

Vibrational spectra of mercury(II) and methylmercury(II) thiocyanates

1969 ◽  
Vol 22 (10) ◽  
pp. 2117 ◽  
Author(s):  
RPJ Cooney ◽  
JR Hall
Keyword(s):  
Raman Spectrum ◽  
Solid State ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Unit Cell ◽  
Infrared And Raman Spectra

The Raman spectra of Hg(SCN)2 in both the solid state and in solution have been recorded and interpreted in conjunction with the infrared spectra. For the solid state the Raman shifts for Hg-S stretching, S-C stretching, and C-N stretching are 270, 721, and 2112 cm-1 respectively. In diglyme solution the corresponding values are 278, 692, and 2139 cm- 1. The infrared and Raman spectra of CH3HgSCN in the solid state do not contain any coincidences which may indicate that the unit cell is centrosymmetric. The Raman spectrum of CH3HgSCN in CH3OH solution shows strong, sharp, polarized lines at 283, 540, 1186, and 2138 cm-1 which are attributed to Hg-S stretching, Hg-C stretching, CH3 deformation, and C-N stretching modes respectively.

Vibrational Spectra of SiH4 and SiD4–SiH4 Mixtures in the Condensed States

1972 ◽  
Vol 50 (1) ◽  
pp. 35-42 ◽  
Author(s):  
R. P. Fournier ◽  
R. Savoie ◽  
Nguyen Dinh The ◽  
R. Belzile ◽  
A. Cabana
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Phase I ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Crystalline Phase ◽  
Solid Phase ◽  
Transition Phase ◽  
Solid Phase Transition

The i.r. and Raman spectra of liquid and crystalline SiH4 and SiD4–SiH4 mixtures have been recorded. The spectra show striking changes when the crystal undergoes the solid–solid phase transition. Phase I is disordered. Possible site, and factor groups for the low temperature crystalline phase are proposed.

Vibrational spectra of aquadioxotetra; peroxodivanadates(V) M2[V2O2(O2)4(H2O)]·xH2O (M = N(CH3)4, Cs)

1990 ◽  
Vol 55 (6) ◽  
pp. 1485-1490 ◽  
Author(s):  
Peter Schwendt ◽  
Milan Sýkora
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectra ◽  
Normal Coordinate Analysis ◽  
Force Constants ◽  
Infrared And Raman Spectra ◽  
Empirical Correlations ◽  
Normal Coordinate ◽  
Bond Lengths ◽  
Stretching Vibrations

The infrared and Raman spectra of M2[V2O2(O2)4(H2O)]·xH2O and M2[V2O2(O2)4(D2O)]·xD2O (M = N(CH3)4, Cs) were measured. In the region of the vanadium-oxygen stretching vibrations, the spectra were interpreted based on normal coordinate analysis, employing empirical correlations between the bond lengths and force constants.

Nitroethane at high density: an experimental and computational vibrational study

2021 ◽  
Vol 23 (15) ◽  
pp. 9325-9336
Author(s):  
Akio Yoshinaka ◽  
Serge Desgreniers ◽  
Anguang Hu
Keyword(s):  
High Pressure ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Unit Cell ◽  
High Density ◽  
Monoclinic Unit Cell ◽  
Vibrational Study

Raman and IR vibrational spectra confirm two molecular units associated with the monoclinic unit cell of nitroethane under high pressure. Raman spectra are extremely sensitive to predicted effects of unit cell distortion due to changes in H-bonding.

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