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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5 citations
TL;DR: In this article, a kinetic study of the aluminium ion-assisted aquation of CoF(NH3)52+ was carried out, where the reaction rate is independent of the pH in the (pH)obsd<3.3 range.
Abstract: A kinetic study of the aluminium ion-assisted aquation of CoF(NH3)52+ was carried out. The pseudo-first order rate constant obtained can be expressed as kobsd=kAl[Al3+], where kAl=(1.6±0.2)×10−3 dm3 mol−1 s−1(I=2.0 mol dm−3, 25 °C). The reaction rate is independent of the pH in the (pH)obsd<3.3 range, in contrast with the pH-dependent rate for the CrF(NH3)52+-Al3+ system. The different behavior between CoF(NH3)52+ and CrF(NH3)52+ in aquation can be explained in terms of their electronic structures, as calculated on the basis of the CNDO/2 method.
5 citations
TL;DR: In this article, the same authors have shown that a single process corresponding to aquation of Me 2 SO is observed in anhydrous Me 2 O in the presence of H 2 O 2 SO 2 SO(NH 3 ) 5 ] 3+ complex.
5 citations
TL;DR: In this article, two aqua derivatives of [Cr(Ala)3] were characterized in solution and two reaction products were detected: thermodynamically stable CrO42− and [CrO2)4]3− that under a large excess of hydrogen peroxide is metastable.
Abstract: Two aqua derivatives of [Cr(Ala)3] were characterized in solution. Acid-catalyzed aquation of cis-[Cr(Ala)2(H2O)2]+ leads to inert [Cr(Ala)(H2O)4]2+, whereas base hydrolysis of cis-Cr(Ala)2(OH)2]− causes dissociation of both the Ala ligands and formation of chromates(III). Kinetics of these processes have been studied spectrophotometrically in both 0.1–1.0 M HClO4 and 0.2–0.9 M NaOH under first-order conditions. A linear dependence of the kobs,H on [H+] and a small dependence of the (kobs)OH on [OH−] were established. In the proposed mechanism, the rate determining step is Cr–N bond breaking in the reactive form of the substrate, i.e., in the protonated aqua- or dihydroxo complex. The effect of pH on the complex reactivity is discussed. The kinetic results are compared with those determined previously for analogous glycine and asparagine complexes. Additionally, oxidation of tris- and bis-Aa–chromium(III) complexes, where Aa = Gly, Ala or Asn, by hydrogen peroxide in alkaline medium was studied. Two reaction products were detected: thermodynamically stable CrO42− and [Cr(O2)4]3− that under a large excess of hydrogen peroxide is metastable. The rate-limiting stage of this process is an inner sphere two-electron transfer within the peroxido intermediate.
5 citations
TL;DR: In this paper, the rate of loss of H2PO4− ligand from bis-dihydrogenphosphato oxovanadium(IV) was determined from analysis of broadening of the 31P magnetic resonance line of LOM NaH2P4 solutions in the presence of vanadyl ion at pH 2.0.
5 citations