Interaction between dimethylsulfoxide and formamide in the liquid state
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Abstract:
Low frequency Raman spectra (20–400 cm−1) are presented of formamide dissolved in dimethylsulfoxide (DMSO). The concentration of formamide ranges from 2%–75% (v/v). The two formamide bands at 110 and 190 cm−1 in the neat liquid exhibit only smaller frequency shifts upon dilution. The intensities of both bands are proportional to the concentration of formamide. The conclusion is, that the linear chain structure, found in neat liquid formamide, is conserved in the DMSO solution. Raman spectra of the NH-stretching region (2950–3500 cm−1) confirm this hypothesis.Keywords:
Dimethyl formamide
Dilution
Liquid state
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Objective:To establish method for determination of residual formamide in Allopurinol by gas chromato-graphy.Methods:Detected by FID detector,Separated by SUPLCOWAX-10.Results:The formamide show a good linear relationship at range of 5～20μg/ml,the average recovery was 95.57%.(RSD=1.74%,n=6)for formamide.Conclusion:It is quite suitable to be used in analysis of the formamide in Allopurinol.
Allopurinol
Dimethyl formamide
Linear range
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Abstract Electrochemical properties of formamide were investigated using cyclic voltammetry (CV) and linear sweep voltammetry (LSV) on an activated carbon paste electrode (CPE). A distinct oxidation peak was at 0.51 V in light of the electrochemical behaviour of formamide-KCl. This indicates an improved current response towards the electrooxidation of formamide due to the high charge-transfer ability of carbon paste. The LSV presented a linear dependence on the concentration of formamide-KCl in the range of 5–110 μM whose limit of detection was 0.16 μM. In addition, this dependable method can be explicitly designed to fit with formamide detection in EVA splicing mats.
Linear sweep voltammetry
Dimethyl formamide
Carbon paste electrode
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Benzalmethylamine, benzalbenzylamine and hydrobenzamide react with formamide, when heated with it, to form N-formylbenzylamine and N-formyldibenzylamine with some by-products. Reduction of these imines at a high temperature and high pressure, under the presence of formamide, results in the conversion of benzal radical to N-formylbenzylamine in almost theoretical yield.
Dimethyl formamide
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This study shows that high variability and low recoveries are obtained when conventional ethanol precipitation is used to recover RNA from the 70%-90% formamide containing solutions that are used to elute poly(U) Sepharose columns. Precipitations of RNA at different formamide concentrations show that the variability of the recovery increases with increasing formamide concentration and the recovery decreases by 7% for each 10% increase in the formamide concentration. The formamide concentration curve shows that these factors can be optimized by diluting the formamide containing solutions at least to 30% formamide prior to the precipitation.
Ethanol precipitation
Dimethyl formamide
Protein precipitation
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Low frequency Raman spectra (20–400 cm−1) are presented of formamide dissolved in dimethylsulfoxide (DMSO). The concentration of formamide ranges from 2%–75% (v/v). The two formamide bands at 110 and 190 cm−1 in the neat liquid exhibit only smaller frequency shifts upon dilution. The intensities of both bands are proportional to the concentration of formamide. The conclusion is, that the linear chain structure, found in neat liquid formamide, is conserved in the DMSO solution. Raman spectra of the NH-stretching region (2950–3500 cm−1) confirm this hypothesis.
Dimethyl formamide
Dilution
Liquid state
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Dimethyl formamide
Dilution
Spin diffusion
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Dimethyl formamide
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Dimethyl formamide
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Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases (1982)
Measurements have been made of the magneto-optical rotations at 435.8 nm of binary liquid mixtures of water with dimethylsulphoxide, formamide, methyl formamide, dimethyl formamide and acetonitrile as part of a study to investigate the applicability of the magneto-optical method in detecting weak molecular interactions in liquid mixtures. The departure from ideality of the mixtures was treated in terms of an excess magnetic rotation, αE. For mixtures of water with dimethylsulphoxide, formamide, methyl formamide and dimethyl formamide the values of αE indicated interaction between the components, whereas with acetonitrile the αE values were compatible with a breakdown of the water structure in the mixtures.
Dimethyl formamide
Optical Rotation
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Benzoic acid
Dimethyl formamide
Standard electrode potential
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