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.

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.

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.

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.

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.

Schwingungsspektren und Kraftkonstanten der Hexacyano-Komplexe des Mangan(I), Technetium(I) und Rhenium(I) / Vibrational Spectra and Force Constants of the Hexacyano Complexes of Mangan(l), Technicium(I) and Rhenium(l)

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1193-1196 ◽  
Author(s):  
W. Krasser ◽  
K. Schwochau
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Point Group ◽  
Force Constants ◽  
Irreducible Representations ◽  
Infrared And Raman Spectra ◽  
Valence Force ◽  
Valence Force Field ◽  
Complex Salts

The infrared and Raman spectra of the complex salts K5[Mn(CN)6], K5[Tc(CN)6] and K5[Re(CN)s] have been recorded in the range from 4000 to 40 cm-1. All expected fundamental vibrations have been observed and could be assigned to the irreducible representations of the sym­metry point group Oh . The calculation of the force constants is based on the concept of the generalized valence force field. The low CN-valence force constants indicate the relatively strong Π-bonding character of the metal carbon bond, which is especially pronounced for K5[Tc(CN)6).

Kristallstruktur und Schwingungsspektren des Di-Blei-Hexaselenohypodiphosphates Pb2P2Se6 / Crystal Structure and Vibrational Spectra of Pb2P2Se6

1984 ◽  
Vol 39 (4) ◽  
pp. 357-361 ◽  
Author(s):  
Robert Becker ◽  
Wolfgang Brockner ◽  
Herbert Schäfer
Keyword(s):  
Crystal Structure ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Title Compound ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Monoclinic System ◽  
Space Group ◽  
Lattice Constants

Pb2P2Se6 crystallizes in the monoclinic system, space group Pn (No. 13) with the lattice constantsa = 974.2 (4) pm. b = 766.2 (3) pm. c = 689.8 (3) pm, β=91.44(5)°.The title compound is isotypic to the homologous Pb2P2S6. In the structure there are discrete P2Se4-6 anions.Far infrared, infrared and Raman spectra of this compound have been recorded. The observed frequencies are assigned on the basis of P2Se4-6 units with C2h symmetry in the crystal. DTA-data have been determined and interpreted.

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