THE INFRARED SPECTRA OF MALONATES AND OXALATES: TEMPERATURE EFFECT

1959 ◽  
Vol 37 (7) ◽  
pp. 1146-1152 ◽  
Author(s):  
R. A. Abramovitch
Keyword(s):  
Carbon Tetrachloride ◽  
Temperature Effect ◽  
Infrared Spectra ◽  
Temperature Effects ◽  
Liquid Films ◽  
Vibrational Coupling ◽  
Rotational Isomers ◽  
Acetonitrile Solutions ◽  
Definite Temperature

The infrared spectra of a number of malonates and oxalates (as liquid films) were examined at various temperatures and narrower slit widths than had previously been used. The absorption in the 5.8 μ region is very complex, at least four bands being observed in each case. Small but definite temperature effects were recorded for both types of esters. At somewhat wider slit widths only two bands were observed, these occasionally having indistinct shoulders. The spectra of some of the compounds were also measured in both carbon tetrachloride and acetonitrile solutions (two bands observed in each case) and the ratios of the intensities of the two bands compared. A possible explanation of the effects observed is that at least two rotational isomers can exist for each compound and that vibrational coupling of the carbonyl stretching frequencies can occur in each of the rotational isomers.

Infrared spectra of aqueous sodium benzoates and salicylates in the carboxyl-stretching region: chelation in aqueous sodium salicylates

1969 ◽  
Vol 47 (24) ◽  
pp. 4577-4588 ◽  
Author(s):  
G. E. Dunn ◽  
R. S. McDonald
Keyword(s):  
Salicylic Acid ◽  
Carbon Tetrachloride ◽  
Infrared Spectra ◽  
Aromatic Compounds ◽  
Deuterium Oxide ◽  
Substituent Effects ◽  
Good Evidence ◽  
Frequency Region ◽  
Aqueous Sodium ◽  
Substituent Constants

Infrared spectra in the frequency region 1300–1760 cm−1 are reported for 41 substituted sodium benzoates and 10 substituted sodium salicylates in deuterium oxide solution, and for 9 substituted salicylic acids in chloroform and carbon tetrachloride solutions. Carboxylate stretching frequencies of benzoates and salicylates correlate poorly with substituent constants, but the asymmetric frequencies of benzoates and salicylates correlate well with each other, and the asymmetric frequencies of benzoates correlate well with the asymmetric frequencies of the corresponding nitrobenzenes. It is suggested that, among substituted aromatic compounds, group vibrations which couple with the ring vibrations may correlate well with similar vibrations of other groups, but not with coupled vibrations of different symmetry, uncoupled vibrations, or substituent constants. Chelation in chloroform solutions of salicylic acid dimers can be detected by its influence on substituent effects, but infrared spectra provide no good evidence for chelation in aqueous sodium salicylates.

scholarly journals THE USE OF INFRARED SPECTROPHOTOMETRY FOR THE ESTIMATION OF SMALL QUANTITIES OF SOME HALOGENATED HYDROCARBONS

1953 ◽  
Vol 31 (4) ◽  
pp. 328-337 ◽  
Author(s):  
L. Breitman ◽  
E. W. R. Steacie
Keyword(s):  
Quantitative Analysis ◽  
Carbon Tetrachloride ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Methyl Chloride ◽  
Ternary Mixtures ◽  
Halogenated Hydrocarbons ◽  
Infrared Spectrophotometry ◽  
Absorption Bands ◽  
Binary And Ternary Mixtures

The infrared spectra of chloral, carbon tetrachloride, and chloroform have been determined between 1500 and 650 cm.−1 over a range of pressures in the gas phase. Absorption bands suitable for the quantitative analysis of binary and ternary mixtures of the components have been selected and their peak intensities shown to obey Beer's Law over the range of pressures studied. Ternary mixtures have been analyzed from the spectra with an accuracy of about 20%.The spectra of dichloromethane and methyl chloride have also been measured under comparable conditions.

Spectral Interpretation and Qualitative Analysis of Organophosphorus Pesticides Using FT-Raman and FT-Infrared Spectroscopy

1996 ◽  
Vol 50 (5) ◽  
pp. 565-571 ◽  
Author(s):  
Peter A. Tanner ◽  
Kim-Hung Leung
Keyword(s):  
Raman Spectroscopy ◽  
Infrared Spectroscopy ◽  
Infrared Spectra ◽  
Temperature Effects ◽  
Organophosphorus Pesticides ◽  
Spectral Interpretation ◽  
Ft Raman Spectroscopy ◽  
Safe Technique ◽  
Characteristic Group ◽  
Ft Raman

FT-Raman spectroscopy is a selective and safe technique for the qualitative identification of organophosphorus pesticides and is not accompanied by sample photodecomposition. Spectra of 14 target pesticides were recorded, and the phosphorus characteristic group frequencies are discussed. Preliminary investigations of solvent and temperature effects upon the infrared spectra were also carried out.

THE INFRARED CARBONYL STRETCHING BANDS OF RING SUBSTITUTED ACETOPHENONES

1957 ◽  
Vol 35 (5) ◽  
pp. 504-514 ◽  
Author(s):  
R. Norman Jones ◽  
W. F. Forbes ◽  
W. A. Mueller
Keyword(s):  
Carbon Tetrachloride ◽  
Infrared Spectra ◽  
Aromatic Nucleus ◽  
Carbon Tetrachloride Solution ◽  
Substituent Group ◽  
Acetophenone Derivatives

An examination has been made of the carbonyl stretching bands in the infrared spectra of acetophenone derivatives substituted in the aromatic nucleus. The positions, integrated absorption intensities, and widths of the bands have been measured in carbon tetrachloride solution. The variation of these quantities is discussed in relation to the nature and position of the substituent group.

The wavenumbers of C=O stretching vibrations of maleinimides

1985 ◽  
Vol 50 (6) ◽  
pp. 1305-1311 ◽  
Author(s):  
Alexander Perjéssy ◽  
Manfred Augustin ◽  
Manfred Köhler
Keyword(s):  
Experimental Data ◽  
Infrared Spectra ◽  
Linear Correlation ◽  
Vibrational Coupling ◽  
Stretching Vibrations

The infrared spectra in the region of fundamental C=O stretching vibrations in tetrachloromethane and chloroform were measured for 59 maleinimide derivatives. A linear correlation between the wavenumbers of symmetric and antisymmetric C=O stretching vibrations was found for a series of 102 experimental data obtained in both solvents. The slope of the νs(C=O) vs νas(C=O) dependence as well as the degree of the vibrational coupling in imide system were discussed and compared with those for analogical five-membered cyclic 1,3-diketones.

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