scholarly journals Infrared Spectra of Troponoid Compounds. II. Absorption Band of O–H Stretching Vibration in Some Tropolones

1961 ◽  
Vol 34 (1) ◽  
pp. 91-93 ◽  
Author(s):  
Yusaku Ikegami
Keyword(s):  
Absorption Band ◽  
Infrared Spectra ◽  
Stretching Vibration

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 intensity of the absorption band in the infrared spectra of magnetized water and sodium oleate solutions

1970 ◽  
Vol 13 (4) ◽  
pp. 1332-1334
Author(s):  
M. A. Orel ◽  
I. V. Kagarlitskaya ◽  
I. V. Lapatukhin ◽  
R. A. Kabirova
Keyword(s):  
Absorption Band ◽  
Sodium Oleate ◽  
Infrared Spectra ◽  
Magnetized Water

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.

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

Numerical estimation of the peak positions for the 1050-1300cm-1 absorption band due to an ester group in the infrared spectra.

1997 ◽  
Vol 46 (9) ◽  
pp. 695-702 ◽  
Author(s):  
Toshio OGAWA ◽  
Kenji HAYASHI ◽  
Satoshi OSAWA ◽  
Tetsuya KOYAMA
Keyword(s):  
Absorption Band ◽  
Infrared Spectra ◽  
Ester Group ◽  
Numerical Estimation

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.

scholarly journals ON THE INFRARED ABSORPTION OF WATER AND HEAVY WATER IN CONDENSED STATES

1956 ◽  
Vol 34 (6) ◽  
pp. 798-808 ◽  
Author(s):  
Paul A. Giguère ◽  
K. B. Harvey
Keyword(s):  
Thin Films ◽  
Absorption Band ◽  
Water Molecule ◽  
Air Temperature ◽  
Heavy Water ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Silver Chloride ◽  
Strong Absorption Band ◽  
Librational Mode

The infrared spectra (from 2 to 30 μ) of thin films of H2O and D2O were measured at various temperatures between 20 ° and −180 °C. A strong absorption band due to the librational mode of the water molecule has its maximum around 710 cm.−1 in the liquid. In ice it is shifted to 800 cm.−1 at −15 °C. and 850 cm.−1 at −170 °C. The corresponding D2O bands show the normal isotope shift. Thin films of water pressed between silver chloride plates could not be crystallized even at liquid air temperature as confirmed by their spectra, which were almost identical with those of the liquid.

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.

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