Infrared spectra of methanol, ethanol, and n-propanol

Abstract

The infrared absorp tion spectra of m eth ano l, ethanol, a nd n-propanol have bee n measured wi th prism instruments. Studies have bce n made of the vapors and of several dilu te solu tio ns. Th e m ethanol spectra, betwee n 2 to 15 mi cron s, provided a direct comparison w ith t he other two alcohols and co nfirmed earli er wo rk on t h e cxistence of a number of lowintensity bands. The two other a lcohol s were studied from 2 to 36 mi crons. T he ?ands have been class ified in relation to the O-H , C-H , CO , a nd CC vibratIOn s wlthlll th e molecules. The long-wave absorption , in the region beyond 30 mi crons, for each alcohol, is att ribu ted to t he hindered rotation of OH. Th e ob ject of t he present stud y was to confirm t he ass ig nmen ts for m ethanol and to stud y and assign th e vibrat ional spectra of ethanol and n-propan ol.

FTIR analysis and quantification of phenols and flavonoids of five commercially available plants extracts used in wound healing

“…To plot a standard curve, 0.5 mL of different solutions of quercetin -"Q" (Sigma-Aldrich, range of 0 µg -125.00 µg) in ethanol was mixed with 0.5 mL of 2% AlCl 3 ethanolic solution in the dark. After incubation for 45 min, the solutions were analyzed in the UV-Vis spectrophotometer (VWR, UV-3100PC Spectrophotometer), wavelength of 415 nm [18].…”

“…An aliquot of 0.1 mL of each solution (Gallic acid or drugs' dilutions), was mixed with 0.5 mL of solution Folin-Ciocalteu (Sigma-Aldrich) for 5 min in the dark. These solutions were then mixed with 0.4 mL of solution 2% Na 2 CO 3 (Sigma-Aldrich) in the dark and incubated for 2h before analysis [18].…”

“…The reference sample (A 0 ) was 1.0 mL of the 100 µM DPPH solution. After incubating for 15 min, they were analyzed in the UV-Vis spectrometer (VWR, UV-3100PC Spectrophotometer), wavelength of 517 nm [18].…”

The Effects of Microwave Heating on the Isothermal Kinetics of Chemicals Reactions and Physicochemical Processes

“…The wave number of resonant oscillations corresponds to the OH twisting vibrations in molecule of ethanol (Plyler, 1952) while the wave number of resonant frequency under the CIRC corresponds to the first overtone of rotation of ethanol molecule. Thus, in the presence of microwave field, molecules of ethanol absorb microwave energy and distribute to the rotation and vibration levels.…”

Evidence for a defect level above the conduction band edge of InAs/InAsSb type-II superlattices for applications in efficient infrared photodetectors

“…Increased noise in the PL signal was seen over the range from 0.34 eV to 0.44 eV due to the absorption of the pressure medium over this wavelength range as shown in Figure 2(b). The interpolated transmission data 20 from liquid methanol and ethanol based on the 4:1 mixture ratio at 300 K (solid line) and the data from ethanol under pressure 21 and frozen methanol spectra 22 are used to estimate the shift and transmission behavior up to 2.16 GPa (dashed line). Based on this evidence it is clear that the transmission data changes with pressure, but whilst it was not possible for us to carry out a dynamic correction at each pressure and temperature we are able to show that the absorption should have little effect above 0.46 eV; this is confirmed by PL spectra from the InGaAsP pressure gauge.…”