Infrared spectra and force constants of urea in the gaseous phase

1995 ◽  
Vol 352 (5) ◽  
pp. 489-495 ◽  
Author(s):  
Jutta Langer ◽  
Bernhard Schrader ◽  
Volker Bastian ◽  
Eberhard Jacob
Keyword(s):  
Infrared Spectra ◽  
Gaseous Phase ◽  
Force Constants

Carbonyl stretching frequencies and force constants in cyclopentadienylmolybdenum tricarbonyl derivatives

1969 ◽  
Vol 47 (16) ◽  
pp. 2959-2964 ◽  
Author(s):  
R. B. King ◽  
L. W. Houk
Keyword(s):  
Infrared Spectra ◽  
Interaction Force ◽  
Force Constants ◽  
Alkyl Groups

The infrared spectra of compounds of the type RM(CO)3C5H5 (M = Mo or W; R = (CH3)3Sn, σ-alkyl groups, halides, etc.) exhibit the expected three v(CO) frequencies (2A′ + A″). The relative positions of the A″ and the lower A′ frequencies interchange upon variation of the electronegativity of the R group. Values for the Cotton–Kraihanzel stretching force constants k1 and k2 have been calculated from these v(CO) frequencies assuming the ratio kd/ks = 2 for the interaction force constants. From these force constants the σ and π parameters of Graham were calculated. The σ and π parameters were found to be very similar for analogous RM(CO)3C5H5 and RMn(CO)5 compounds.

Infrared spectra of KH2F3 and the structure of the H2F3− ion

1967 ◽  
Vol 45 (12) ◽  
pp. 1347-1350 ◽  
Author(s):  
A. Ažman ◽  
A. Ocvirk ◽  
D. Hadži ◽  
Paul A. Giguère ◽  
Michel Schneider
Keyword(s):  
Solid State ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Normal Coordinate Analysis ◽  
Force Constants ◽  
Hydrogen Atoms ◽  
Normal Coordinate ◽  
Bending Modes

The infrared absorption of KH2F3 and KD2F3in the solid state was measured between 4 000 and 200 cm−1 The observed bands can be assigned to the stretching and bending modes of the bent H2F3− ion. A normal coordinate analysis was carried out to determine the Urey–Bradley force constants. The results suggest that the hydrogen atoms are not exactly halfway between two fluorine atoms, contrary to the case of the HF2− ion.Les spectres infrarouges de KH2F3 et KD2F3 à l'état solide ont été mesurés entre 4 000 et 200 cm−1 afin d'identifier les vibrations fondamentales de l'anion H2F3−. Les constantes de forces de rappel selon le modèle de Urey–Bradley ont pu être déterminées par analyse des coordonnées normales. Les résultats indiquent que les atomes d'hydrogène ne sont pas exactement à mi-chemin entre deux atomes de fluor, contrairement au cas de l'ion HF2−.

Infrared spectra and force constants of CH2Cl2, CHDCl2, and CD2Cl2

1962 ◽  
Vol 8 (1-6) ◽  
pp. 222-235 ◽  
Author(s):  
Takehiko Shimanouchi ◽  
Isao Suzuki
Keyword(s):  
Infrared Spectra ◽  
Force Constants

Bestimmung der Kraftkonstanten der Hexafluoro-Komplexe des Technetium(IV) und Rhenium(IV) auf der Basis der D4h-Symmetrie

1970 ◽  
Vol 25 (2) ◽  
pp. 206-210 ◽  
Author(s):  
Wolfgang Krasser ◽  
Klaus Schwochau
Keyword(s):  
Force Field ◽  
Infrared Spectra ◽  
Force Constants ◽  
Irreducible Representations ◽  
Octahedral Complex ◽  
Site Symmetry ◽  
Complex Ions ◽  
Linear Combinations ◽  
Valence Force Field ◽  
Stretching Vibrations

Abstract The infrared spectra of potassium and cesium hexafluorotechnetate (IV) and -rhenate(IV) show a D4h-distortion of the octahedral complex ions. The splitting of degeneracies is not due to site symmetry. The linear combinations of the force constants of the irreducible representations A2u and Eu are determined in the valence force field on the basis of D4h-symmetry. As expected the force constants of stretching vibrations of [TcF6]-- are then smaller than those of [ReF6]--.

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