Abstract
We have investigated the character of the interaction of water in amide-salt systems and have developed a spectral method of determining low water contents in N-methylpyrrolidone (NMP) and dimethylacetamide (DMAc), both pure and containing lithium chloride. To free the solvents from water, they were purified by distillation and then were dried over molecular sieves for five days. To avoid incidence of atmospheric moisture into the solvents, preparation of solutions and filling of cuvettes with them was carried out in a dry box. Spectra were recorded on double-beam UR-20 or IR-75 spectrophotometers. We investigated water content in organic solvents having the following concentrations of it: in DMAc, 0.01-1% in the absence of LiCI, and with LiCI concentrations of 2.5, 3.5, and 5.0%; for more accurate determination of microquantities of water in DMAc, 0.01-1%, with no LiCI and with an LiCI concentrationof 2.5, 3.5, and 5.0%; in NMP, of 0.03-0.3%. We used sectional standard cuvettesof thiekness0.O04, 0.007, 0.024, and 0.026 cm, with windows of KBr and NaCI, selecting the thickness of the absorbing layer from the optimum in absorption of the analytical band.
Published Version
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