Proton magnetic resonance spectra of Be(N0 3h solutions in mixtures of water and dimethylsulphoxide (DMSO) have been measured at different solvent compositions and temperatures at 270 MHz. The relative amounts of the solvated species Be(OH 2),.(DMSO)4_i have been determined. The total solvation number was 4. The kinetics of solvent exchange has been studied in DMSO. The proton exchange in pure aqueous solutions may be explained in terms of a protolysis reaction. The solvent molecule preferentially solvating the beryllium ion is DMSO in water rich solutions and water in DMSO rich solutions. Protonenresonanzmessungen von Be(N0 3h-Losungen in Wasserdimethylsulfoxid-(DMSO)-Mischungen wurden bei verschiedenen Losungsmittelzusammensetzungen und Temperaturen mit 270 MHz durchgefuhrt. Die relativen Mengen der solvatisierten lonen Be(OH 2),.(DMSO)4_i wurden bestimmt. Die Gesamtsolvatationszahl war 4. Die Solvensaustauschkinetik wurde in DMSO untersucht. Der Protonenaustausch in waBrigen Losungen laBt sich als eine Protolysereaktion interpretieren. Das bevorzugt das Berylliumion solvatisierende Solvensrnolekul ist DMSO in wasserreichen 'und Wasser in DMSO-reichen Losungen.usually proceed according to the Eigen-Tamm [1] mechanism:
The formation of the inner-sphere complex of BeSO.. in mixtures of water and formamide has been investigated using the pressure-jump relaxation method. Whereas in the two pure solvents the reaction is characterized by a single relaxation time in the solvent mixtures two relaxation processes superimpose and which are attributed to the replacement of a water or a formamide molecule, respectively, in the inner-sphere by the entering sulphate ion. -The multistep association mechanism proposed by Eigen and Tamm [1] prevails also in the solvent mixtures. With increasing mole fraction of formamide the dielectric constant increases and in accordance with Fuoss equation [2] the association constants of the outer-sphere complexes decrease. However, the inner-sphere stability constants increase sharply so that the total association constants of BeSO.. increase with the formamide content.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.