The C–H bending vibration v 4 of chloroform CH35Cl3

Anttila, R.; Аланко, С.; Horneman, V.‐M.

doi:10.1080/00268970410001725846

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…As shown in Figure 10 , the FTIR spectra of the two rubbers showed similar characteristic bands. Among them, 835 33 cm –1 was the characteristic vibration peak of natural rubber skeleton stretching. The deformation vibration peak of the −CH 3 group was 1380 34 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

Preparation of Taraxacum kok-saghyz Rubber and Biofuel Ethanol Simultaneously by the Yeast Fermentation Process

Zhao

Xiang

et al. 2023

ACS Omega

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Taraxacum kok-saghyz (TKS) rubber is considered the most ideal alternative source of natural rubber (NR). Extracting rubber from TKS with high quality, low cost, and low pollution is the basis of commercial development. The TKS roots were subjected to morphological observation and detailed compositional analysis. Scanning electron microscopy (SEM) images confirm that rubber filaments are physically entangled with plant tissues due to differences in molecular polarity. Compared with the traditional solvent TKS rubber extraction process, a new rubber extraction process developed in this study, namely, the microbial extraction (″ME″) process, is less harmful to the environment and lower in cost. The ″ME″ process is divided into three steps: dilute acid pretreatment process, enzyme degradation process, and fermentation process. After each step is completed, the purity of TKS rubber will gradually increase from 84.8% to 93.8 to 95.5%. The TKS rubber finally obtained fully meets the requirements of the traditional rubber industry, especially the tire industry. Besides, the yield of biofuel ethanol, a by-product of cellulose fermentation, reaches 2.05 g/100 g of TKS roots (dry weight), which can effectively reduce the production cost of TKS rubber. In the rubber extraction process, microorganisms have little effect on the quality of TKS rubber. The results show that the molecular weight and chemical structure of TKS rubber is very close to NR, so the ″ME″ process can be used as a new method for large-scale extraction of TKS rubber.

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Section: Resultsmentioning

confidence: 99%

Preparation of Taraxacum kok-saghyz Rubber and Biofuel Ethanol Simultaneously by the Yeast Fermentation Process

Zhao

Xiang

et al. 2023

ACS Omega

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25 CHCl3 Trichloromethane

Demaison

2010

Symmetric Top Molecules

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Vibrational spectra of chloroform, freon-11 and selected isotopomers in the terahertz region

Haase

Liu

Merkt

2010

Journal of Molecular Spectroscopy

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The fundamental bands of the CCl 3 asymmetric deformation modes of selected isotopomers of chloroform (CHCl 3 ) and freon-11 (CFCl 3 ) have been measured in a static cell at ambient temperature using a laser-based source of tunable radiation in the terahertz region of the electromagnetic spectrum.The analysis of the rotational contours of the bands enabled the derivation of the fundamental frequencies with an accuracy of better than 3 GHz.Keywords: THz spectroscopy, vibrational spectrum Spectroscopy in the terahertz (THz) region of the electromagnetic spectrum (0.1-10 THz) is challenging because the generation and detection of radiation in this region is difficult. Despite recent progress with radiation sources in the THz region, such as backward-wave oscillators (BWO) We report here a measurement of the absorption spectra of 12 CHCl 3 ,13 CHCl 3 , CDCl 3 and CFCl 3 with natural isotopic abundance of chlorine in the region of the ν 6 fundamental band. This mode is of e symmetry for the C 3v isotopomers but splits into two modes, ν 6 (a ′ ) and ν 9 (a ′′ ), in isotopomers of C s symmetry (we follow the usual convention for numbering the normal modes, see p. 25 of Ref.[20]).The experimental setup was identical to the one described in Ref.[11] and was placed under an N 2 -purged plexiglas cage to reduce water absorption.12 CHCl 3 , 13 CHCl 3 , 12 CDCl 3 and 12 CFCl 3 were supplied by Sigma-Aldrich (≥ 99.5% purity) and used without further purification. A one-meter-long absorption cell with white, ultra-high molecular weight (UHMW) polyethylene windows was filled with 120 mbar ( frequencies of the ν 6 (a ′ ) and ν 9 (a ′′ ) modes calculated ab initio also appear degenerate within the expected precision limit of the method used (see Table 1).

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The C–H bending vibration v ₄ of chloroform CH³⁵Cl₃

Cited by 10 publications

References 13 publications

Preparation of Taraxacum kok-saghyz Rubber and Biofuel Ethanol Simultaneously by the Yeast Fermentation Process

Preparation of Taraxacum kok-saghyz Rubber and Biofuel Ethanol Simultaneously by the Yeast Fermentation Process

25 CHCl3 Trichloromethane

Vibrational spectra of chloroform, freon-11 and selected isotopomers in the terahertz region

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