Analyse des spectres de vibration de la β-alanine, de la taurine et de la ciliatine-β

1978 ◽  
Vol 56 (5) ◽  
pp. 663-669 ◽  
Author(s):  
Chantal Garrigou-Lagrange
Keyword(s):  
Raman Spectra ◽  
Normal Mode ◽  
Force Fields ◽  
Infrared And Raman Spectra ◽  
Valence Force ◽  
The Given

Infrared and Raman spectra of solid β-alanine, taurine and ciliatine (β form) are analysed. A normal mode calculation is made. The given valence force fields of the three crystalline molecules are very similar. It shows the N—CαH2—CβH2— radical is electronically equivalent in the three molecules.

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).

scholarly journals Normal-mode analysis of infrared and Raman spectra of poly(vinyl fluoride)

1992 ◽  
Vol 3 (1) ◽  
pp. 55-66 ◽  
Author(s):  
J.W. Hong ◽  
J.B. Lando ◽  
J.L. Koenig ◽  
S.H. Chough ◽  
S. Krimm
Keyword(s):  
Raman Spectra ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Mode Analysis ◽  
Infrared And Raman Spectra ◽  
Vinyl Fluoride

scholarly journals The Vibrational Spectra of Silane and Germane Derivatives. Part IV. The Infrared and Raman Spectra of the Iodo(methyl)germanes

1971 ◽  
Vol 49 (18) ◽  
pp. 2931-2936 ◽  
Author(s):  
J. W. Anderson ◽  
G. K. Barker ◽  
J. E. Drake And ◽  
R. T. Hemmings
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
A Priori ◽  
Normal Coordinate Analysis ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
Fundamental Frequencies

The infrared and Raman spectra of the series of iodo(methyl)germanes, CH3GeI3, (CH3)2GeI2, and (CH3)3GeI have been recorded. A normal coordinate analysis based on a modified valence force field confirms the a priori assignments for all of the fundamental frequencies except the torsional modes.

Schwingungsspektren der Clusterverbindung Nb6F15/Vibrational Spectrum of the Cluster Compound Nb6F15

1989 ◽  
Vol 44 (1) ◽  
pp. 74-78 ◽  
Author(s):  
G. Kliche ◽  
H. G. von Schnering
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Vibrational Spectrum ◽  
Raman Spectra ◽  
Metal Cluster ◽  
Cluster Compound ◽  
Vibrational Modes ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force

Abstract Infrared and Raman spectra of the metal cluster compound [Nb6F12]F3 (cubic Im3̄m; Z = 2) are reported. The three intense m odes observed in the Raman spectrum at 215. 267, and 337 cm-1 and a weak mode observed in the infrared spectrum at 287 cm-1 are assigned to the T2g, Eg, A1g, and T1u vibrational modes of the Nb6 octahedra. The assignment is supported by normal coordinate analysis and Raman measurements at 47 kbar. The valence force constants are f(Nb-Fi) = 2.04, f(Nb-Fa-a) = 1.30 and f(Nb-Nb) = 0.97 N cm-1 metal-to-metal interaction in the cluster.

scholarly journals Vibrational Spectra and Force Constants of Tetrasulfurtetranitride, S4N4 [1]

1981 ◽  
Vol 36 (8) ◽  
pp. 850-858 ◽  
Author(s):  
Ralf Steudel
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Point Group ◽  
Force Constants ◽  
Infrared And Raman Spectra ◽  
Valence Force ◽  
Group D ◽  
Single Bonds ◽  
Good Agreement

Abstract Infrared and Raman spectra of solid and dissolved S414N4 and of solid S415N4 have been recorded and assigned in accordance with the molecular point group D2d. 22 of the 28 fundamental vibrations of both molecules have been identified and used to calculate force constants applying a modified Urey-Bradley force field with 9 independent constants. Good agreement between observed and calculated wavenumbers was obtained, and both Urey-Bradley and valence force constants are given. The results indicate that-S4N4 basically contains eight SN single bonds and two extremely weak SS bonds.

Vibrational Spectra of 1,1-Dichlorocyclopropane

1971 ◽  
Vol 49 (15) ◽  
pp. 2533-2538 ◽  
Author(s):  
J. M. Freeman ◽  
P. J. Robinson
Keyword(s):  
Raman Spectra ◽  
Normal Mode ◽  
Vibrational Spectra ◽  
Force Constants ◽  
Infrared And Raman Spectra ◽  
Correct Assignment ◽  
Computer Procedure

Infrared and Raman spectra of 1,1-dichlorocyclopropane are reported. Force constants were determined by an iterative computer procedure for two possible sets of assignments of the normal mode frequencies. It is suggested that in the correct assignment the methylene rocking modes are at higher frequency than the twisting modes.

Normalscliwingungen von Alkalifeldspäten

1977 ◽  
Vol 146 (1-3) ◽  
pp. 1-18 ◽  
Author(s):  
Manfred O. von Stengel
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Normal Modes ◽  
Infrared And Raman Spectra ◽  
Frequency Range ◽  
Average Deviation ◽  
Valence Force ◽  
Valence Force Field ◽  
Modes Of Vibration ◽  
Alkali Feldspars

AbstractThe normal modes of vibration of various alkali feldspars were calculated on the basis of a simple harmonic valence force field. Infrared and Raman spectra were recorded over the whole frequency range. With 7 force constants for ordered feldspars and 5 constants for disordered feldspars the calculated frequencies could be fitted with an average deviation of 10–16 cm

The vibrational spectra of some phenylmercuric halides and diphenylmercury

1977 ◽  
Vol 30 (9) ◽  
pp. 1905 ◽  
Author(s):  
CG Barraclough ◽  
GE Berkovic ◽  
GB Deacon
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
Phenylmercuric Chloride ◽  
Good Agreement

The Raman spectra of phenylmercuric chloride, phenylmercuric bromide, phenylmercuric iodide and diphenylmercury, and the infrared and Raman spectra of diphenylmercury in solution are reported. Using the previously reported infrared spectra of these compounds, vibrations were assigned, normal coordinate analyses were performed and frequencies were calculated using a valence force field. Good agreement was achieved between observed and calculated frequencies. The structure of diphenyl-mercury in solution is discussed.

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