Infrared Spectrum, X-Ray Diffraction Pattern, and Structure of Ammonium Fluoride

Plumb, Robert C.; Hornig, D. F.

doi:10.1063/1.1742153

Cited by 87 publications

(37 citation statements)

References 8 publications

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“…The situation is very similar in the tri~nethylamine salts as Table I X shows. T h e ammonium salts show quite clearly a large difference between the fluoride and the other halides, which has been discussed by Plumb and I-Iornig (25). Thus is would seem that while the hydrofluorides and hydrochlorides of these bases may have higher bending frequencies, salts with other anions show no systematic variations For personal use only.…”

Section: (134) 930mentioning

confidence: 77%

Vibrational Spectra of Pyridinium Salts

Cook¹

1961

Can. J. Chem.

272

109

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'The vibrational spectrum of the pyridiniuln ion, CjHjI\TH+, and the N-deuterated species has been studied in several pyridinium salts. By comparison with benzene and deuterobenzene (with which the p y r i d i n i~~~n ion is isoelectronic) a fairly complete assignment has been made. The N-H bonds, which are hydrogen bonded to the anions, have stretching vibrations which show systematic variations depending on the nature of the anion. The N-H in-plane deformation vibrations show little variation while the out-of-plane deformation vibrations, some of which do vary, are probably affected, in addition, by other factors. INTRODUCTIONPyridine forms salts with many strong mineral and organic acids. In these salts it is assumed that complete proton transfer taltes place between the acid and the pyridine molecule, giving the pyridinium ion I and an anion.Little spectroscopic data on such salts is available in the published literature." Greenwood and Wade (I) assigned a few bands from their published spectra of C5H6NH+Cl-and C5HSNH+BC14-, while Kynaston and co-workers (2) listed all the bands in the latter salt. Spinner published a list of frequencies in the infrared and Raman spectrum (aqueous solution) of C6H6T\TI-I+C1-(3) and made a few assignments.In these papers emphasis was placed on sinlilarities between these salts and C5HsN. I t is believed that a more pertinent and helpful co~npariso~l is between the pyridiniurn ion and C61-16. These n~olecules contain the same number of atoms, are isoelectronic, and, apart from the mass and electronegativity of the nitrogen atom, would be identical. This physical similarity brealts down, however, when the synlrnetry of the two ~nolecules is compared. C6Ho has D6h, and C6H6NH+ is expected t o have Cz, symmetry. Thus C6H6 has only four (strictly) infrared-active fundamentals and seven Ranlan fundamentals. C6H6NH+ will have 30 Raman-active fundamentals and 27 infrared-active fundamentals. (The selection rules are shown in Table I.) The conlparison between C6HBD and C6HSND+, however, reveals a much closer similarity, since both molecules now have Cz, symmetry, with identical selection rules.

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Section: (134) 930mentioning

confidence: 77%

Vibrational Spectra of Pyridinium Salts

Cook¹

1961

Can. J. Chem.

272

109

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“…7,8 Both of these papers included a spectrum recorded at room temperature and atmospheric pressure. In both cases the spectra showed only a single strong band near 240 cm 1 .…”

Section: Raman Spectramentioning

confidence: 97%

“…1 Only the triply degenerate stretching and bending modes 3 and 4 are active in the infrared region. These were observed at 2815 cm 1 ( 3 ) and 1494 cm 1 ( 4 ).…”

Section: Infrared Spectramentioning

confidence: 99%

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Low‐temperature Raman spectra of polycrystalline NH₄F and ND₄F

Shurvell

Brown

Fredericks

et al. 2001

J Raman Spectroscopy

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Raman spectra of polycrystalline ammonium fluoride and fully deuterated ammonium fluoride were recorded at various temperatures between 80 and 300 K. The spectra were obtained using a cold stage attached to a Raman microscope. At low temperatures the Raman lines were sharper and shifted to higher wavenumbers compared with their room temperature counterparts. However, no indications of any crystalline phase change were observed at low temperatures. A strong line at 2876 cm −1 was assigned to the infrared inactive symmetric NH stretching mode n 1 .A 1 /. A very strong line at lower wavenumbers (2818 cm −1 ) was assigned to the antisymmetric stretching mode n 3 .F 2 /. Observed deuterium isotope shifts were in agreement with those calculated using the Redlich-Teller isotope product rule. The degenerate bending modes n 2 .E/ and n 4 .F 2 / were observed in the Raman spectra of NH 4 F and ND 4 F for the first time. The n 2 fundamental was split into doublets in the low-temperature spectra, as predicted from a factor group analysis based on the known crystal structure. Three bands due to translational lattice modes were observed between 400 and 200 cm −1 in the spectra of both isotopic molecules. Several bands in both spectra are assigned to overtones and combinations involving an ammonium ion libration, but no bands directly attributable to ammonium ion librations were observed.

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“…[83,84,85]. Desta forma, não se pode descartar a formação de compostos contendo este íon ou a absorção deste íon nos compostos com a estrutura do diamante.…”

Section: Caracterização Espectroscópicaunclassified

Síntese de nanocristais de KY3F10 pelo método de co-precipitação visando aplicações ópticas

Linhares¹

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Infrared Spectrum, X-Ray Diffraction Pattern, and Structure of Ammonium Fluoride

Cited by 87 publications

References 8 publications

Vibrational Spectra of Pyridinium Salts

Vibrational Spectra of Pyridinium Salts

Low‐temperature Raman spectra of polycrystalline NH₄F and ND₄F

Síntese de nanocristais de KY3F10 pelo método de co-precipitação visando aplicações ópticas

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Infrared Spectrum, X-Ray Diffraction Pattern, and Structure of Ammonium Fluoride

Cited by 87 publications

References 8 publications

Vibrational Spectra of Pyridinium Salts

Vibrational Spectra of Pyridinium Salts

Low‐temperature Raman spectra of polycrystalline NH4F and ND4F

Síntese de nanocristais de KY3F10 pelo método de co-precipitação visando aplicações ópticas

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Low‐temperature Raman spectra of polycrystalline NH₄F and ND₄F