Solvent effects on infrared spectra of 2-methyl-4,5-dimethoxy-3-oxo-2H-pyridizine: Part 1. Single solvent systems

2002 ◽  
Vol 3 (3) ◽  
pp. 288 ◽  
Author(s):  
Qing LIU
Keyword(s):  
Infrared Spectra ◽  
Solvent Effects ◽  
Solvent Systems

Infrared spectroscopic studies of solvent effects on the conformation of n-alkanes

1986 ◽  
Vol 64 (8) ◽  
pp. 1544-1547 ◽  
Author(s):  
H. L. Casal ◽  
P. W. Yang ◽  
H. H. Mantsch
Keyword(s):  
Chain Length ◽  
Infrared Spectra ◽  
Solvent Effects ◽  
Spectroscopic Studies ◽  
Thermodynamic Quantities ◽  
Branched Hydrocarbons ◽  
Infrared Spectroscopic ◽  
Induced Changes

The infrared spectra of specifically deuterated n-tridecane-7,7-d2 pure and mixed with several linear and branched hydrocarbons have been measured as a function of temperature. The average gauche fraction at the middle of the n-tridecane chain has been determined from the intensities of conformation-specific CD2 rocking bands. The results indicate that the concentration of gauche rotamers in the centre of the n-C13 chains varies with the solvent. For example, when n-tridecane is dissolved in other n-hydrocarbons the gauche concentration decreases when the chain length of the solvent is shorter than n-C13 and increases when the solvent chains are longer than n-C13. However, no simple, direct correlation is found between these solvent-induced changes in gauche concentration and measured thermodynamic quantities of mixing.

scholarly journals Interaction entre le groupe carbonyle et les hétéroatomes des acétates d'éthyle α-substitués

1985 ◽  
Vol 63 (9) ◽  
pp. 2343-2348 ◽  
Author(s):  
Georges Guihéneuf ◽  
Christian Bénard ◽  
Abdeljalil Lachkar ◽  
Maryvonne Luçon
Keyword(s):  
Carbonyl Group ◽  
Infrared Spectra ◽  
Solvent Effects ◽  
Lone Pair ◽  
Fermi Resonance ◽  
Nitrogen Lone Pair

Infrared spectra of ethyl α-aminoacetates show three bands in the carbonyl region. Solvent effects show that this is not due to Fermi resonance. These spectra can be interpreted using a model that considers the interactions between the nitrogen lone pair and the carbonyl group. The existence of an equilibrium between the conformers caused by the different orientations of the nitrogen lone pair with respect to the carbonyl group can be forecast. This model enables the interpretation of the carbonyl absorptions of the α-substituted (methoxy and ethoxy) ethyl acetates.

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