The association in mixtures of dimethylsulphoxide and water as studied by Raman spectroscopy

In mixtures of dimethylsulphoxide (DMSO) and water, formation of a complex (DMSO) · (H₂O)₂ is indicated by wavenumber shifts and linewidth variations of the v SO Raman band. Higher temperatures interfere with this complex formation.     

The conformational behaviour of some p-tolylsulphlnamides

Eight sulphinamides of the type p-CH₃C₆H₄-S(O)-NHR, where R represents an aliphatic group, were investigated by means of IR spectroscopy. The doubling of the SO stretching frequency of the free molecules is discussed in terms of conformational isomerism, originated by the rotation around the S-aryl axis. The two conformers participate differently in the H bond, NH-OS. The doublets of the NH bands in the spectra of the free molecules occur because of the existence of two conformations and are due to the rotation about the SN axis. The H bonds influence the conformational behaviour of the molecules. The H bond enthalpies are estimated by calorimetric measurements to lie between about 6 and 20 kJ for the complete association of one mol monomer. The NMR spectra show that the NH proton is part of the spin-spin coupling system.     

Ein Analogon des Satzes von Pick in der Theorie mehrerer komplexer Veränderlichen

Ohne Zusammenfassung     

Eine Ergänzung zum Satz von Beckman und Quarles

Ohne Zusammenfassung

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