THE CARBONYL-STRETCHING VIBRATION OF ARYLALIPHATIC ESTERS

1963 ◽  
Vol 41 (9) ◽  
pp. 2154-2159 ◽  
Author(s):  
Keith Bowden ◽  
N. B. Chapman ◽  
J. Shorter
Keyword(s):  
Infrared Spectra ◽  
Conformational Isomers ◽  
Mass Effects ◽  
Stretching Vibration

The infrared spectra in the carbonyl-stretching region of certain arylaliphatic esters, RCOOMe, have been examined. The stretching frequencies and absorption intensities are presented and are discussed in terms of polar and α-mass effects and the occurrence of conformational isomers.

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 .

scholarly journals O-H stretching vibration in Fourier transform difference infrared spectra of bacteriorhodopsin

FEBS Letters ◽  
1991 ◽  
Vol 287 (1-2) ◽  
pp. 157-159 ◽  
Author(s):  
Chia-Wun Chang ◽  
Noriko Sekiya ◽  
Kazuo Yoshihara
Keyword(s):  
Fourier Transform ◽  
Infrared Spectra ◽  
Stretching Vibration

Studies on metal hydroxy compounds. II. Infrared spectra of zinc derivatives ϵ-Zn(OH)2, β-ZnOHCl, ZnOHF, Zn5(OH)8Cl2, and Zn5(OH)8Cl2·H2O

1967 ◽  
Vol 45 (6) ◽  
pp. 585-588 ◽  
Author(s):  
O. K. Srivastava ◽  
E. A. Secco
Keyword(s):  
Infrared Spectra ◽  
Group Factor ◽  
Absorption Bands ◽  
Site Group ◽  
Planar Molecule ◽  
Stretching Vibration ◽  
Hydroxy Compounds ◽  
A Site ◽  
First Time ◽  
Unambiguous Assignment

Infrared spectra of ϵ-Zn(OH)2, β-ZnOHCl, ZnOHF, Zn5(OH)8Cl2, and Zn5(OH)8Cl2·H2O and their deuterated analogues in the range 2.5–16 μ are reported for the first time. The effects of substituting a halogen for an OH group in Zn(OH)2 are (i) sharper OH stretching absorption bands, (ii) splitting of bands involving OH to give distinct doublets in ZnOHF and Zn5(OH)8Cl2, indicating strong intermolecular coupling, and (iii) shift of the OH stretching vibration to a higher frequency. Strong absorption bands are observed in the region of 695–780 cm−1 for all compounds and also near 1 020 ± 30 cm−1 in all cases except ZnOHCl. All the observed bands are displaced to lower frequencies by the deuterated analogues, with vH/vD ratios in the range 1.30–1.36. A cursory interpretation of the spectra of ZnOHCl and ZnOHF is given in terms of a planar molecule of Cs symmetry, but the unambiguous assignment of the bands must await a site group or group factor analysis.

Hydrogen sulphide – halogen complexes studied by matrix isolation vibrational spectroscopy

1985 ◽  
Vol 63 (7) ◽  
pp. 1705-1707 ◽  
Author(s):  
U. P. Agarwal ◽  
A. J. Barnes ◽  
W. J. Orville-Thomas
Keyword(s):  
Low Temperature ◽  
Vibrational Spectroscopy ◽  
Infrared Spectra ◽  
Hydrogen Sulphide ◽  
Matrix Isolation ◽  
Reaction Products ◽  
Hydrogen Halides ◽  
Stretching Vibration

Infrared spectra are reported of mixtures of hydrogen sulphide with chlorine or bromine in low-temperature argon or nitrogen matrices. The H2S … Cl2 and H2S … Br2 complexes were identified from the perturbed halogen stretching vibration. Absorptions due to the corresponding hydrogen halides provided evidence that reaction was occurring between the hydrogen sulphide and halogen (despite the use of a twin-jet deposition), and other reaction products were tentatively identified from the observed absorptions.

Synthesis, Structure and Electrochemical Behavior of a Supramolecular Compound

2009 ◽  
Vol 79-82 ◽  
pp. 1475-1478
Author(s):  
Zhi Feng Lin ◽  
Shu Fang Zhang ◽  
Dun Zhang
Keyword(s):  
Infrared Spectra ◽  
Elemental Analysis ◽  
Electrochemical Behavior ◽  
Reduction Reaction ◽  
Aqueous Environment ◽  
Cyclic Voltammograms ◽  
Supramolecular Compound ◽  
Uv Spectrum ◽  
Vibration Absorption ◽  
Stretching Vibration

A supramolecular compound, Co(C5H4NCOO)2(H2O)2∙2H2O was hydrothermally synthesized and characterized by elemental analysis, infrared spectra, UV-vis spectra. Elemental analysis result shows that the mass percent of C is 38.36%; H, 4.32% and N, 7.50%. Infrared spectra show that the main absorption peak is near 3396 cm-1, which is attributed to the O-H stretching vibration absorption. Also there are some absorption peaks at 1599, 1551, 1420, 1384 cm-1, which are attributed to the pyridine vibration absorption. UV spectrum for the compound shows strong absorption peaks at 203 and 259 nm, which are similar to isoniazid. X-ray diffraction data indicate that the compound is monoclinic, P21 / c space group. The cyclic voltammograms indicate that the compound decreases the rate of oxygen reduction reaction (ORR) and induces the ORR more difficult in aqueous solutions. The electrochemical behavior suggests that the compound possesses the potential application for corrosion in aqueous environment.

A Low Temperature Infrared Study of Self-association in Thiols

1972 ◽  
Vol 50 (22) ◽  
pp. 3594-3600 ◽  
Author(s):  
R. Bicca de Alencastro ◽  
C. Sandorfy
Keyword(s):  
Hydrogen Bonding ◽  
Low Temperature ◽  
Infrared Spectra ◽  
Low Temperatures ◽  
Infrared Study ◽  
Text Type ◽  
Stretching Vibration ◽  
Aliphatic Thiols ◽  
Self Association ◽  
Associated Species

The infrared spectra of several aliphatic thiols and of benzenethiol were measured between 2400 and 2700 cm−1, and 4800 and 5300 cm−1 in a 1:1 mixture of CCl3F and C2F4Br2, at temperatures ranging from 20 to −190 °C. Dimerization takes place at low temperatures and more highly associated species also appear. Free S—H groups are present in the solutions as well as in the pure liquids, even at the lowest temperatures. The association is of the [Formula: see text] type in aliphatic thiols; both [Formula: see text] and [Formula: see text] bonds are found in the case of benzenethiol and α-toluenethiol. Hydrogen bonding has little effect on the anharmonicity of the S—H stretching vibration.

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 Polysubstituted Pyrimidines in the 700–200 cm−1 Region

1968 ◽  
Vol 22 (3) ◽  
pp. 170-182 ◽  
Author(s):  
D. A. Netzel ◽  
T. S. Hermann ◽  
F. F. Bentley
Keyword(s):  
Infrared Spectra ◽  
Deformation Mode ◽  
Mass Effects ◽  
Out Of Plane ◽  
Ring Deformation

The infrared spectra of 28 substituted pyrimidines are presented in the 700–200 cm−1 region. These compounds are characterized by the in-plane ring deformation mode near 500 cm−1, and the out-of-plane ring deformation near 450 cm−1. The resonance, inductive, and mass effects on these and on other fundamental modes are also presented.

Infrared spectra and conformation of substituted methyl cyclohexanecarboxylates and 2-hydroxycyclohexanecarboxylates

1979 ◽  
Vol 44 (2) ◽  
pp. 410-419 ◽  
Author(s):  
Soňa Vašíčková ◽  
Miloš Tichý
Keyword(s):  
Carboxylic Acids ◽  
Infrared Spectra ◽  
Conformational Equilibrium ◽  
Hydroxy Acids ◽  
Stretching Vibration ◽  
Integrated Intensities

Infrared bands due to carbonyl and hydroxyl stretching vibration were measured for 32 esters of substituted cyclohexane and trans-decalin carboxylic acids and 2-hydroxy acids. The bands were computer-separated and most of them assigned to the appropriate rotamers. The conformational equilibrium in methyl trans-2-hydroxy-cis-4-isopropylcyclohexanecarboxylate was determined using comparison of integrated intensities of the hydroxyl bands of the mobile compound with those of the conformationally biased standards. The OH/COOCH3 vicinal interaction was found to be attractive (about 2.6 kJ mol-1).

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