Low Temperature Infrared Study of Hydrogen Bonding in Acetone Oxime-d6

1973 ◽  
Vol 51 (9) ◽  
pp. 1441-1442 ◽  
Author(s):  
Thérèse Di Paolo ◽  
Camille Sandorfy
Keyword(s):  
Hydrogen Bonding ◽  
Low Temperature ◽  
Infrared Spectrum ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Infrared Study ◽  
Acetone Oxime

The infrared spectrum of (CD3)2C=N—OH was measured in solution down to liquid nitrogen temperature. As the temperature is lowered several new "associated bands" appear indicating the presence of species more highly associated than cyclic dimers or trimers.

scholarly journals Assignment for the Infrared Spectrum of Solid Sodium Propionate from Low-Temperature Measurements in Combination with 13C Isotopic Shifts

1987 ◽  
Vol 42 (5) ◽  
pp. 477-484 ◽  
Author(s):  
Masato Kakihana ◽  
Tadashi Nagumo
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Sodium Propionate ◽  
Coupled Modes ◽  
Temperature Spectrum ◽  
Isotopic Shifts ◽  
Complete Assignment ◽  
Room Temperature Spectrum

The infrared spectra of CH3CH2COONa and its 13C-labeled modifications (1-13C, 2-13C, and 3-13C) suspended in KBr disks were measured in the region 4000 -200 cm-1 at room temperature and liquid nitrogen temperature. Overlapping complex band contours appeared in some regions of the room temperature spectrum, most notably in the region 1500 -1350 cm-1, where 5 fundamentals having contributions from the methyl deformation, methylene bending, and carboxylate stretching modes should occur. In contrast to this, excellent resolution was reached at the low temperature, from which all 22 fundamentals expected in the whole spectral region investigated were detected. A complete assignment of the fundamentals is proposed mainly on the basis of the characteristic isotopic shifts of the three 13C substituted sodium propionate species. A fair number of the fundamentals were found to feature coupled modes having contributions from several group vibrations.

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.

Low Temperature Infrared Study of Hydrogen Bonding in Dissolved Pyrrole and Indole

1973 ◽  
Vol 51 (7) ◽  
pp. 1075-1082 ◽  
Author(s):  
Marie-Claude Bernard-Houplain ◽  
C. Sandorfy
Keyword(s):  
Hydrogen Bonding ◽  
Low Temperature ◽  
Spectroscopic Methods ◽  
Infrared Study ◽  
Stretching Vibration ◽  
Self Association ◽  
Associated Species

Self-association by hydrogen bonding in the case ot pyrrole was studied by i.r. spectroscopic methods. The fundamental first and second overtones of the NH stretching vibration were measured at different concentrations and at temperatures ranging from 22 to −190 °C. The existence of at least two associated species in solution has been ascertained. 2,5-Dimethylpyrrole and indole were also studied and gave similar results.

Infrared study of matrix-isolated ethyl cyanide: simulation of the photochemistry in the atmosphere of Titan

2015 ◽  
Vol 17 (45) ◽  
pp. 30352-30363 ◽  
Author(s):  
A. Toumi ◽  
N. Piétri ◽  
I. Couturier-Tamburelli
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Matrix Isolation ◽  
Infrared Study

Low-temperature Ar matrix isolation has been carried out to investigate the infrared spectrum of ethyl cyanide (CH3CH2CN), a molecule present in the atmosphere of Titan.

scholarly journals Effect of low temperature rolling on mechanical properties and corrosion resistance of CrCoNi medium entropy alloy

2021 ◽  
Author(s):  
Jinliang Chen ◽  
Zhongxue Feng ◽  
Jianhong Yi ◽  
Jun Yang
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Liquid Nitrogen ◽  
Magnetic Levitation ◽  
Rolling Direction ◽  
Liquid Nitrogen Temperature ◽  
304 Stainless Steel ◽  
Mechanical Properties And Corrosion ◽  
Low Temperature Rolling

Abstract Abstract: For the casted CrCoNi medium entropy alloy melted by magnetic levitation, the deformation was carried out in 4 passes under the condition of liquid nitrogen temperature (-196°C), the total reduction was 50%,The microstructure and properties were analyzed after liquid nitrogen low temperature rolled. The experimental data showed that the phase structure of the alloy was not changed under the low-temperature rolling. The grains, crushed and refined, were elongated along the rolling direction. With the increasing of passes and reduction, the tensile strength increased from 585 MPa to 1359 MPa, while the elongation decreased from 37.8% to 5.9%. work With the increasing of work hardening,the tensile strength of the CrCoNi medium entropy alloy gradually increased, while the plasticity dramatic decreased. At the same time,the corrosion resistance of the CrCoNi medium entropy alloy was improved by low temperature cold rolled. The corrosion resistance of as-cast and rolled CrCoNi was much better than 304 stainless steel.

A low-temperature matrix isolation infrared study of the interaction between phosphine and zerovalent copper, nickel and chromium

1978 ◽  
Vol 31 (11) ◽  
pp. 2549 ◽  
Author(s):  
GA Bowmaker
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Matrix Isolation ◽  
Infrared Study ◽  
Copper Nickel ◽  
Temperature Matrix ◽  
The Matrix ◽  
Dilute Mixture

The infrared spectrum of the matrix produced by co-deposition of copper vapour with neat phosphine at 60 K showed new bands at c. 2245, 1057, 1005, 997, 593 and 512 cm-1. These bands shifted to 1635, 766, 742, 733, 450, 370 cm-1 when PD3 was used in place of PH3. When nickel or chromium were used in place of copper, new bands were observed at 2280, 1004 cm-1 and 2250, 1025 cm-1 respectively. The infrared spectrum of the matrix produced by co-deposition of copper vapour with a dilute mixture of phosphine in krypton at 12 K showed new bands at 2250, 970, 968 and 958 cm-1. Experiments involving variation of the PH3 : Kr ratio and replacement of PH3 by a 1 : 1 PH3/PD3 mixture suggest that the latter three bands are due to Cu(PH3)n with n = 1, 3 and 2 respectively.

Infrared Spectrum of Potassium Oxalate Monohydrate at Liquid Nitrogen Temperature

1970 ◽  
Vol 24 (6) ◽  
pp. 598-601 ◽  
Author(s):  
V. S. Tomar ◽  
H. D. Bist ◽  
D. P. Khandelwal
Keyword(s):  
Infrared Spectrum ◽  
Liquid Nitrogen ◽  
Ir Spectrum ◽  
Room Temperature ◽  
Considerable Increase ◽  
Liquid Nitrogen Temperature ◽  
The Other ◽  
Potassium Oxalate ◽  
Spectral Changes

The ir spectrum of K2C2O4. H2O is reported at liquid nitrogen temperature (LNT). On the basis of present work and earlier Raman studies, the frequencies at 3400, 3250, 1615, 1600, 1577, 1487, 1311, 902, 780, 605, 522, 449, 353, and 305 cm−1 have been assigned to the fundamental internal modes of C2O4 and H2O groups. In addition, the wagging and rocking modes of bonded water have been assigned unambiguously at 737 and 646 cm−1, respectively. Compared with the spectrum at room temperature, the spectral changes on cooling to LNT are as follows: (1) The bands at 522 and 1311 cm−1 each show splitting into two bands; (2) the librational modes of crystalline H2O show considerable increase in peak intensities accompanied by sharpening and a shift of about +20 cm−1; and (3) among the internal modes of H2O the symmetric stretching mode at 3250 cm−1 shows greater enhancement than the other two modes.

Low-temperature oxidation of YBa2Cu3O6.0 with nitrogen dioxide

1991 ◽  
Vol 6 (5) ◽  
pp. 891-894 ◽  
Author(s):  
Stephen A. Montzka ◽  
Brooks M. Hybertson ◽  
Robert M. Barkley ◽  
Robert E. Sievers
Keyword(s):  
Low Temperature ◽  
Nitrogen Dioxide ◽  
Liquid Nitrogen ◽  
Degradation Products ◽  
Liquid Nitrogen Temperature ◽  
Meissner Effect ◽  
Mixed Phase ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation

Nitrogen dioxide was used to oxidize nonsuperconducting, powdered YBa2Cu3O6.0 to form a material that exhibits the Meissner effect at liquid nitrogen temperature. Nitrogen dioxide treatment at 200 °C for 70 h results in a mixed-phase material containing superconducting YBa2Cu3O6.9 that exhibits onset of superconductivity at 91.5 K and a midpoint at 88 K. During a 70-h exposure of YBa2Cu3O6 to NO2 at 200 °C, a mixture of oxidation and degradation products is formed, including YBa2Cu3O6.9 (61% by weight) and Ba(NO3)2 (23% by weight). Heating the NO2-treated product to 900 °C results in the evolution of NO, NO2, and O2; cooling the sample and annealing at 400 °C in an O2 stream generates the superconducting oxide.

Sign in / Sign up

Export Citation Format

Share Document