Raman Spectra of Solid (NH4)2CrO4 and (ND4)2CrO4 Obtained by a Rotating Cell Technique

The Raman spectra of polycrystalline (NH4)2CrO4 and (ND4)2CrO4 have been obtained by a sample rotation technique where the uncompressed solid is contained in a glass cylindrical cell. The apparatus is a commerically available sample rotator for liquids, which was modified for the described solid sampling technique. The Raman spectra of (NH4)2CrO4 and (ND4)2CrO4 are discussed in relation to their uniquely monoclinic structure, in contrast to the β-K2SO4 structure found for (NH4)2SO4 and many alkali metal chromates and sulfates. The hydrogen bonding in (NH4)2CrO4 is described, and its role in determining both the structure and the Raman spectra is discussed. The data suggest a barrier to NH4+ rotation of approximately 3.70 kcal/mol, indicating that the ammonium ions are not freely rotating on the time scale of the Raman experiment (10−13 sec).

Download Full-text

Hydrogen Bonds: Raman Spectroscopic Study

International Journal of Molecular Sciences ◽

10.3390/ijms22105380 ◽

2021 ◽

Vol 22 (10) ◽

pp. 5380

Author(s):

Boris A. Kolesov

Keyword(s):

Hydrogen Bonding ◽

Hydrogen Bonds ◽

Spectroscopic Study ◽

Raman Spectra ◽

Temperature Region ◽

Vibrational Frequency ◽

Chemical Compounds ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Proton Dynamics

The work outlines general ideas on how the frequency and the intensity of proton vibrations of X–H×××Y hydrogen bonding are formed as the bond evolves from weak to maximally strong bonding. For this purpose, the Raman spectra of different chemical compounds with moderate, strong, and extremely strong hydrogen bonds were obtained in the temperature region of 5 K–300 K. The dependence of the proton vibrational frequency is schematically presented as a function of the rigidity of O-H×××O bonding. The problems of proton dynamics on tautomeric O–H···O bonds are considered. A brief description of the N–H···O and C–H···Y hydrogen bonds is given.

Download Full-text

Understanding water structure from Raman spectra of isotopic substitution H2O/D2O up to 573 K

Physical Chemistry Chemical Physics ◽

10.1039/c7cp02065a ◽

2017 ◽

Vol 19 (32) ◽

pp. 21540-21547 ◽

Cited By ~ 18

Author(s):

Qingcheng Hu ◽

Haiwen Zhao ◽

Shunli Ouyang

Keyword(s):

Hydrogen Bonding ◽

Raman Spectra ◽

Water Structure ◽

Free Water ◽

Isotopic Substitution ◽

Structure Model ◽

Single Donor ◽

Hydrogen Bonded

The OH/OD stretch band features on Raman spectra of isotopic substitution H2O/D2O at temperatures up to 573 K are correlated with a multi-structure model that water has five dominant hydrogen bonding configurations: tetrahedral, deformed tetrahedral, single donor, single hydrogen bonded water and free water.

Download Full-text

Evaluation of the solid sampling technique for the determination of aluminium in biological materials by atomic absorption and atomic emission spectrometry

Fresenius Zeitschrift für Analytische Chemie ◽

10.1007/bf00554018 ◽

1987 ◽

Vol 328 (4-5) ◽

pp. 400-404 ◽

Cited By ~ 7

Author(s):

W. Frech ◽

D. C. Baxter

Keyword(s):

Atomic Absorption ◽

Sampling Technique ◽

Atomic Emission ◽

Biological Materials ◽

Atomic Emission Spectrometry ◽

Emission Spectrometry ◽

Solid Sampling

Download Full-text

HIGHLY SYMMETRIC STRUCTURE OF ALKALI METAL COMPLEXES OF 18-CROWN-6 AND 15-CROWN-5 IN LIQUID AND CRYSTALLINE STATES AS REVEALED BY RAMAN SPECTRA

Chemistry Letters ◽

10.1246/cl.1978.635 ◽

1978 ◽

Vol 7 (6) ◽

pp. 635-638 ◽

Cited By ~ 28

Author(s):

Hiroyasu Sato ◽

Yoshihumi Kusumoto

Keyword(s):

Alkali Metal ◽

Metal Complexes ◽

Raman Spectra ◽

Symmetric Structure ◽

Alkali Metal Complexes

Download Full-text

Optimization of a phosphine oxide disulfoxide array for multipoint hydrogen bonding to ammonium ions

Journal of the American Chemical Society ◽

10.1021/ja00070a055 ◽

1993 ◽

Vol 115 (17) ◽

pp. 7900-7901 ◽

Cited By ~ 17

Author(s):

Paul B. Savage ◽

Steven K. Holmgren ◽

Samuel H. Gellman

Keyword(s):

Hydrogen Bonding ◽

Phosphine Oxide ◽

Ammonium Ions

Download Full-text

Hydrogen bonding effects on infrared and Raman spectra of drug molecules

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2006.02.045 ◽

2007 ◽

Vol 66 (2) ◽

pp. 213-224 ◽

Cited By ~ 36

Author(s):

Laban Bondesson ◽

Kurt V. Mikkelsen ◽

Yi Luo ◽

Per Garberg ◽

Hans Ågren

Keyword(s):

Hydrogen Bonding ◽

Raman Spectra ◽

Infrared And Raman Spectra ◽

Drug Molecules

Download Full-text

Resonance Raman Spectra of Alkali-Metal Doped Polyacettlene

Molecular Crystals and Liquid Crystals ◽

10.1080/00268948508074658 ◽

1985 ◽

Vol 117 (1) ◽

pp. 401-409 ◽

Cited By ~ 32

Author(s):

H. Eckhardt ◽

L. W. Shacklette ◽

J. S. Szobotaand ◽

R. H. Baughman

Keyword(s):

Alkali Metal ◽

Raman Spectra ◽

Resonance Raman ◽

Resonance Raman Spectra ◽

Metal Doped

Download Full-text

Hydrogen-bonding-induced oligoanthranilamide foldamers. Synthesis, characterization, and complexation for aliphatic ammonium ions

Tetrahedron ◽

10.1016/j.tet.2005.06.042 ◽

2005 ◽

Vol 61 (33) ◽

pp. 7974-7980 ◽

Cited By ~ 42

Author(s):

Hui-Ping Yi ◽

Chuang Li ◽

Jun-Li Hou ◽

Xi-Kui Jiang ◽

Zhan-Ting Li

Keyword(s):

Hydrogen Bonding ◽

Ammonium Ions

Download Full-text

Electrochemical preparation and properties of the mixed-crystalline hexavanadates MxM′4−xV6O16, M, M′ = NH4, K, Rb, Cs

Canadian Journal of Chemistry ◽

10.1139/v90-198 ◽

1990 ◽

Vol 68 (8) ◽

pp. 1283-1292 ◽

Cited By ~ 17

Author(s):

E. Andrukaitis ◽

P. W. M. Jacobs ◽

J. W. Lorimer

Keyword(s):

Chemical Analysis ◽

Alkali Metal ◽

Mixed Crystals ◽

Continuous Series ◽

Alkali Metal Cations ◽

X Ray Diffraction ◽

Ammonium Ions ◽

Electrochemical Preparation ◽

X Ray ◽

End Members

Coherent deposits of oriented, crystalline MxM′4−xV6O16+δ, with M, M′ = K, Rb, Cs, or NH4, 0.0 ≤ x ≤4.0 and 0.00 ≤ δ ≤ 0.13, have been prepared electrochemically on various conducting substrates from metavanadate solutions containing ammonium or alkali metal cations, singly or in combination. Chemical analysis and X-ray diffraction show that the deposits consist of a continuous series of mixed crystals based on the isomorphic end members M4V6O16 and M′4V6O16.The deposits can be oxidized electrochemically, with removal of M and M′ atoms, and the products can be used as cathodes for insertion of lithium, with the largest capacity achieved about 1.0 mol% of total vanadium. Cycling of the electrodes improves capacity, with insertion of lithium reaching 25 mol% of total vanadium. This gain in capacity results from further removal of alkali metal or ammonium ions from the electrode during the oxidation step of the cycling process.The results extend the range of composition of homogeneous phases in the system (NH4)2O–K2O–V2O4–V2O5. Keywords: alkali metal hexavanadates, electrochemical preparation.On a préparé des dépôts cohérents qui contiennent des cristaux orientés de MxM′4−xV6O16+δ, avec M, M′ = K, Rb, Cs ou NH4, 0,0 ≤ x ≤4,0 et 0,00 ≤ δ ≤ 0,13, par la méthode de voltammétrie cyclique sur des substrats divers et dans des solutions de metavanadates qui contiennent des cations des métaux alcalins ou d'ammonium seuls ou des combinations de tels ions. L'analyse chimique et la diffraction des rayons X ont démontré que les dépôts comprennent une série continue de cristaux mixtes basée sur les membres terminaux M4V6O16 et M′4V6O16.

Download Full-text