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|Type:||Artigo de periódico|
|Title:||The Shape Of The Refractive Index Versus Composition Curves For Hydrogen-bonded Liquid Mixtures|
|Abstract:||The dependence of volume fractions (%V) on the square of the refractive index (n2) has been determined for a series of intermolecular hydrogen-bonded systems. An additive linear relationship between %V and n2 is obtained for weakly hydrogen-bonded solutions of acetone and methanol while mixtures of acetone/water and methanol/water give a parabolic shape for the refractive-index diagrams. Surprisingly, a quasi-linearity (but with singular and turning points not apparent on the refractive-index curves) is found for strongly hydrogen-bonded cases such as 2,2,2-trifluoroethanol(TFE)/water, TFE/acetone, TFE/methanol, 1,1,1,3,3,3-hexafluoro-2-propanol (HFP)/water, HFP/acetone and HPP/methanol. This unexpected observation is explained in terms of the coexistence of various stable hydrogen-bonded species corresponding to different geometrical isomers and polymer complexes in the mixtures. The proposed explanation is confirmed by MENDO/3 molecular orbital calculations. © 1981.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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