Far infrared spectra of charge-transfer complexes between iodine and substituted pyridines

1967 ◽  
Vol 297 (1451) ◽  
pp. 440-448 ◽  
Keyword(s):  
Charge Transfer ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Far Infrared ◽  
Charge Transfer Complexes ◽  
Absorption Bands ◽  
Substituted Pyridines ◽  
Stretching Vibration ◽  
Far Infrared Spectra ◽  
Electronic And Steric Effects

Far infrared spectra of charge-transfer complexes between iodine and substituted pyridines, dissolved in cyclohexane, have been measured in the region 20 to 200 cm -1 . Bands have been assigned to the modified iodine molecule stretching vibration near 180 cm -1 , and to the stretching of the intermolecular bond in the range 65 to 95 cm -1 . The shifts of the vibration frequencies, and force constants calculated using a simple valency force field, have been discussed in relation to the mass, electronic and steric effects of substituent groups. Equilibrium constants for the formation of the complex have been determined. From the intensities of the absorption bands, further evidence has been found for a vibronic interaction, leading to a delocalization of the transition moment in the vibrations of the complexes, and to an enhancement of the intensity of absorption.

Hydrogen bonding in the gas phase: the thermodynamic properties of hydrogen fluoride-ether complexes and their far infrared spectra

1971 ◽  
Vol 322 (1548) ◽  
pp. 137-146 ◽  
Keyword(s):  
Hydrogen Bonding ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Far Infrared ◽  
Methyl Ethyl ◽  
Rotational Contour ◽  
Stretching Vibration ◽  
Conformational Rearrangements ◽  
Far Infrared Spectra

The equilibrium constants of gas-phase complexes of HF with dimethyl, methyl ethyl and diethyl ether have been measured at several temperatures using the Benesi-Hildebrand approximation on the absorption band of the HF stretching vibration in the complex. From these, values of Δ H of — 43, — 38 and — 30 kJ mol -1 respectively, have been determined. They are interpreted in terms of conformational rearrangements of the ethers when they form hydrogen bonds. The far infrared spectra of the complexes with both HF and DF have also been recorded and in each case a band observed at around 180 cm -1 which is assigned to the intermolecular stretching mode of vibration. For the complex between HF and dimethyl ether a rotational contour has been observed at about 10 cm -1 .

The far infrared spectra of IBr charge–transfer complexes

1987 ◽  
Vol 86 (12) ◽  
pp. 6665-6668 ◽  
Author(s):  
Roseanne J. Sension ◽  
Herbert L. Strauss
Keyword(s):  
Charge Transfer ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Charge Transfer Complexes ◽  
Far Infrared Spectra

Isotopic Studies of the Metal–Ligand Bond. Part II. The Far Infrared Spectra of Some Binuclear and Polymeric Copper Carboxylate Derivatives; Variable Temperature and Isotopic Studies of the Copper–Ligand Vibrations

1973 ◽  
Vol 51 (4) ◽  
pp. 514-519 ◽  
Author(s):  
A. B. P. Lever ◽  
B. S. Ramaswamy
Keyword(s):  
Infrared Spectra ◽  
Variable Temperature ◽  
Copper Acetate ◽  
Far Infrared ◽  
Dimeric Complexes ◽  
Isotopic Studies ◽  
Stretching Vibration ◽  
Amine Adducts ◽  
Far Infrared Spectra ◽  
Ligand Bond

The far infrared spectra of 16 adducts of pyridine, quinoline, isoquinoline, urea, aniline, o- and p-toluidine with copper acetate, propionate, and butyrate, and of copper formate tetrahydrate were recorded at ambient temperature and at −196 °C. A range of derivatives were prepared containing isotopically pure 65Cu. The spectra of these derivatives were used to identify, unequivocally, the copper–oxygen stretching frequencies.Complexes believed to be polymeric (aniline and toluidine adducts) exhibit one copper–oxygen stretching vibration between 300 and 350 cm−1 A second band, lying between 350 and 400 cm−1 is not isotopically sensitive. The dimeric complexes exhibit one or two bands in the 300–400 cm−1 region, all of which are isotopically sensitive. Certain of the amine adducts exhibit an isotopically sensitive band near 240 cm−1 assignable to a Cu—N stretching mode.

Infrared spectra of hydrogen-bonded salicylic acid and its derivatives. Methyl salicylate

1983 ◽  
Vol 61 (7) ◽  
pp. 1449-1452 ◽  
Author(s):  
Marek J. Wójcik ◽  
Czesława Paluszkiewicz
Keyword(s):  
Infrared Spectra ◽  
Methyl Salicylate ◽  
Low Frequency ◽  
Far Infrared ◽  
Gaseous State ◽  
Stretching Vibration ◽  
Intramolecular Hydrogen ◽  
Solid Liquid ◽  
Far Infrared Spectra ◽  
Hydrogen Bonded

Infrared spectra of hydrogen-bonded methyl salicylate have been studied in the temperature range 173–293 K, in solutions of various concentrations (in CCl4) and in the gaseous state. Results show that the molecules form monomerie intramolecular hydrogen bonds in the solid, liquid, and gaseous state. Far-infrared spectra were recorded which give the wavenumber of low-frequency O … O mode used in theoretical reconstruction of the band connected with the O—H stretching vibration. The position and especially the width of this band are determined to a large extent by the influence of the environment.

Far-infrared spectra of polycrystallineBa2YCu3O9−δ

1987 ◽  
Vol 36 (1) ◽  
pp. 846-849 ◽  
Author(s):  
G. A. Thomas ◽  
H. K. Ng ◽  
A. J. Millis ◽  
R. N. Bhatt ◽  
R. J. Cava ◽  
...  
Keyword(s):  
Infrared Spectra ◽  
Far Infrared ◽  
Far Infrared Spectra
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