Topic
Aquation
About: Aquation is a research topic. Over the lifetime, 1443 publications have been published within this topic receiving 17507 citations.
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TL;DR: In this paper, the entropies of activation of these reactions are large and negative, which indicates that the transition states are highly organized, and this high instability was explained in terms of the adsorption of the transition state on mercury during the inner-sphere electron transfer.
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TL;DR: In this article, the synthesis and characterization of mono-, bis- and tris-glycinatochromium(III) complexes by elemental analysis, UV-Vis, electron paramagnetic resonance (EPR), ATR-FTIR and Raman spectroscopy has been performed.
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TL;DR: The rate constants and activation parameters evaluated for these reaction paths have been compared with those for similar carboxylato-cobalt(III) complexes and indicates that the rate-determining step involves opening of the unprotonated or the protonated ring of the malonate ligand and insignificant solvation of the central metal ion.
Abstract: The title complex aquates in acid media, first to [Co(mal)-(H2O)2(en)]+ (1) (Step 1) and subsequently to [Co(H2O)4(en)]3+(2) (Step 2). Complex species (1) has been separated and characterised in solution. While Step 1 involves only a second-order acid catalysed path, Step 2 involves both a first-order acid independent path and a second-order acid catalysed path. The rate constants and activation parameters evaluated for these reaction paths have been compared with those for similar carboxylato-cobalt(III) complexes. This, together with an observed isokinetic relation, indicates that the rate-determining step involves opening of the unprotonated (in the spontaneous acid independent path) or the protonated (for the acid catalysed path) chelate ring of the malonate ligand and insignificant solvation of the central metal ion.
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TL;DR: In this paper, the acid-catalysed aquation of trans-dinitrotetramminecobalt(III) nitrate has been studied in the presence of chloride ions over a temperature range 25-40° at an ionic strength of 2·5M.
Abstract: The acid-catalysed aquation of trans-dinitrotetramminecobalt(III) nitrate has been studied in the presence of chloride ions over a temperature range 25–40° at an ionic strength of 2·5M. In the acid range [H+]= 0·1–1·5M at [Cl–]= 2·0M, the increase in the rate may be interpreted in terms of the reactions of the ion-pairs [Co(NH3)4(NO2)2]+Cl–, [Co(NH3)4(NO2)(NO2H)]2+Cl–, and [Co(NH3)4(NO2H)2]3+Cl–. Rate constants for each reaction have been obtained and thermodynamic parameters derived. The results are consistent with a reaction scheme involving a solvent-assisted dissociative mechanism.
1 citations