The viscosities, densities, and refractive indices at 25, 30, 35, and 40 "C were determined for the systems: aniline + toluene (A + T), N,N-dimethylaniline + toluene (DMA + T), and aniline + nbutanol (A + B). From the experimental results the excess volume, excess viscosity, and excess molar free energy of activation of flow were calculated. The deviations from ideality for the excess thermodynamic functions are more important for the systems (A + T) and (A + B) than for (DMA + T). This fact is explained by the existence of dispersion forces in the mixture and by the presence of hydrogen bonds in pure aniline and pure butanol.
La position des protons dans NaBr.2H₂O a été déterminée par l'analyse des spectres de R. M. N. d'un monocristal. Les deux molécules d'eau forment trois liaisons d'hydrogène rectilignes avec des bromes (H˗Br moyen : 2,37 Å). L'entourage positif des bromes (2Na 4H) est prismatique trigonal.
The proton magnetic resonance spectrurn of single crystals of I-IgSO.,.lII?O has been investigated. This crystal is of interest since, according to the X-ray structure analysis, it appears lilcely that one of the protons of the water molecule is hydrogen-bonded In the structure, while the other is free. Two nonequivalent sets of parallel M-1-1 vectors have been observed in agreement with the crystal symmetry. The angles of one of the intra~nolecular M-I-I vectors with the crystallographic axes are CY = 58", p = 9j0, and 7 = 36". The results are consistent with the suggestion that one of the protons does not form a hydrogen bond in the crystal.
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