The influence of pressure on the OH valence vibration of zoisite

1989 ◽  
Vol 16 (7) ◽  
Author(s):  
B. Winkler ◽  
K. Langer ◽  
P.G. Johannsen
Keyword(s):  
Valence Vibration

Solvent effect on valence vibration of NH bond of acetanilides and phenylcarbamates

1976 ◽  
Vol 41 (2) ◽  
pp. 430-432
Author(s):  
V. Bekárek ◽  
J. Jirkovský ◽  
K. Pragerová ◽  
J. Socha
Keyword(s):  
Solvent Effect ◽  
Valence Vibration

Temperature changes of OH bond valence vibration bands

1971 ◽  
Vol 15 (1) ◽  
pp. 893-898
Author(s):  
G. V. Yukhnevich ◽  
Nuen Van Lang
Keyword(s):  
Valence Vibration ◽  
Bond Valence ◽  
Temperature Changes

Structure of the Associated OH Valence Vibration Band in Light and Heavy Acetic, Trichloroacetic, and Trifluoroacetic Acids*

1953 ◽  
Vol 43 (11) ◽  
pp. 1102 ◽  
Author(s):  
Nelson Fuson ◽  
Marie–Louise Josien
Keyword(s):  
Valence Vibration ◽  
Vibration Band

Valence vibration frequencies, E?C, in organic compounds containing elements of the IVth group (E=Si, Ge, Sn)

1964 ◽  
Vol 5 (1) ◽  
pp. 51-54 ◽  
Author(s):  
I. V. Obreitov ◽  
N. A. Chutaevskii
Keyword(s):  
Organic Compounds ◽  
Valence Vibration ◽  
Vibration Frequencies

N=N Vibrational Frequencies and Fragmentation Patterns of Substituted 1-Aryl-3,3-Dialkyl-Triazenes: Comparison with other High-Nitrogen Compounds

1993 ◽  
Vol 47 (7) ◽  
pp. 986-993 ◽  
Author(s):  
F. Zimmermann ◽  
Th. Lippert ◽  
Ch. Beyer ◽  
J. Stebani ◽  
O. Nuyken ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Mass Spectra ◽  
Valence Vibration ◽  
Vibrational Frequencies ◽  
Substitution Pattern ◽  
Ft Ir ◽  
Characteristic Fragmentation ◽  
Fragmentation Patterns ◽  
Substituted 1 ◽  
Ir And Raman

The influence of substitution pattern and electronic structure on the N=N stretching frequencies of compounds containing three to six linearly connected nitrogen atoms has been investigated by FT-IR and Raman spectroscopy. For a series of 1-phenyl-3,3-dialkyl-triazenes, Phe-N1=N2-N3 R2, shifts in the two valence vibrations of the triazeno group are studied with respect to the type and position of substituents at the aromatic ring, and for various alkyl substituents at N3. The N1=N2 stretching frequency is lowered by electron-withdrawing substituents at the aromatic ring; this effect is most pronounced for para-positioned substituents. A decrease in the N1=N2 bond order, and of the associated valence vibration, is also observed upon introduction of heavier N3-alkyl substituents, due to an inductive effect. Changes in vibrational frequencies are correlated with characteristic fragmentation patterns in the mass spectra of these compounds, where two degradation routes subsequent to ionization at the nitrogen atoms N1 and N2 have been observed. For the investigated pentazadiene derivatives, a weaker dependence of the N=N vibrational frequencies on the substituents is found. Mass spectra are interpreted in terms of two typical fragmentation pathways, involving a McLafferty rearrangement.

Electro-Optical Parameters of Some Benzene Derivatives obtained by Molecular Orbital Calculations

2008 ◽  
Vol 59 (2) ◽  
pp. 216-219 ◽  
Author(s):  
Mihaela Dimitriu ◽  
Liliana-Mihaela Ivan ◽  
Dana-Ortansa Dorohoi
Keyword(s):  
Dipole Moments ◽  
Chemical Properties ◽  
Valence Vibration ◽  
Oscillator Strengths ◽  
Molecular Orbital Calculations ◽  
Optical Parameters ◽  
Covalent Bonds ◽  
Physico Chemical ◽  
Hyperchem Software ◽  
Derivatives Of

A series of structural and physico � chemical properties of some monosubstituted halogene � derivatives of benzene were analyzed by using HyperChem software package. The bond lengths, the angle between the covalent bonds, atomic charges, the symmetry class, the energies of the ground and excited states, the dipole moments, the polarizabilities, the wavelengths of the electronic transitions and the corresponding oscillator strengths have been obtained and correlated with experimental data published for the studied compounds. The computed molecular polarizability a is directly correlated with the measured halogene atomic electronegativity. A polynomial dependence of order two was evidenced between the valence vibration wavenumber of C-X bond, experimentally determined and the computed polarizability.

Tieftemperatur-Raman-Messungen an bewegten Proben bei 10 K am Beispiel der Isotopomeren Cs2[Pt35Cln37Cl6-n, n = 0-6 / Low-Temperature Raman Measurements on Moved Samples at 10 K Exemplified by the Isotopomers Cs2[Pt35Cln 37Cl6-n], n = 0-6

1993 ◽  
Vol 48 (12) ◽  
pp. 1737-1741 ◽  
Author(s):  
W. Preetz ◽  
E. Parzich
Keyword(s):  
Low Temperature ◽  
Ligand Exchange ◽  
Room Temperature ◽  
Valence Vibration ◽  
Closed Cycle ◽  
Exchange Reactions ◽  
Normal Coordinate ◽  
Point Groups ◽  
Isotopic Effects ◽  
Good Agreement

A technique to record Raman spectra of deeply coloured solids at low temperature (10 K) is described, using a closed cycle He-cryogenerator and moving the cell by an excentric attachment. The spectroscopic resolution is considerably enhanced as compared to room temperature or 80 K measurements. This is obvious from splittings of Raman lines observed at 10 K on the isotopomers Cs2[Pt35Cln37Cl6-n], n = 1 -5, which have been prepared by stereospecific ligand exchange reactions. As a consequence of lowered symmetry the degenerate valence vibration v2(Eg, Oh) is split into two lines for the isotopomers belonging to the point groups D4h, C4v and C2v. The isotopic effects calculated by normal coordinate analysis are in good agreement with the observed frequencies.

ChemInform Abstract: TRANSITION METAL-CARBYNE COMPLEXES. 35. VALENCE VIBRATION FREQUENCY AND FORCE E CONSTANT OF THE TUNGSTEN-CARBON TRIPLE BOND

1978 ◽  
Vol 9 (14) ◽  
Author(s):  
E. O. FISCHER ◽  
NGUYEN QUY DAO NGUYEN QUY DAO ◽  
W. R. WAGNER
Keyword(s):  
Transition Metal ◽  
Vibration Frequency ◽  
Triple Bond ◽  
Valence Vibration ◽  
Carbyne Complexes
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