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 compound with the composition [Co(NH3)4(NO2)2]NO3,HNO3 was reformulated as Co(NH 3)4 (HNO2)(NO2)](NO3)2 on the basis of spectroscopy.
Abstract: The compound with the composition [Co(NH3)4(NO2)2]NO3,HNO3, originally described by S. M. Jorgensen, is reformulated cis-[Co(NH3)4(HNO2)(NO2)](NO3)2, on the basis of spectroscopy. A new convenient method of preparation is described.
6 citations
TL;DR: In this article, a plausible mechanism for the metal promoted reactions is proposed, which runs parallel to the metal monomalonato complex formation constants, and shows that metal ions exert appreciable catalytic effect on the aquation of the complex with kM following the sequence Cu(II)>Ni(II), Ni(II,Ni, Ni, Co, Ni and Zn.
Abstract: Metal ion catalyzed aquation of tris(malonato)chromate(III) ion has been followed spectrophotometrically in perchloric acid solution ([H+]=0.05 M) over a temperature range at an ionic strength of 2.0 M. Under these conditions kobsd=kH[H+]+kM[M2+] where kobsd is the observed first order rate constants for the protons and the metal ion catalyzed pathways. Metal ions exert appreciable catalytic effect on the aquation of the complex with kM following the sequence Cu(II)>Ni(II)>Co(II)>Zn(II)>Mn(II), which runs parallel to the metal monomalonato complex formation constants. A plausible mechanism for the metal promoted reactions is proposed.
6 citations
6 citations
TL;DR: The second-order rate constants for the mercury-catalysed aquation of Co en2(RNH2)Cl]2+ cations, where R is H, Me, Et, Prn, and Pri, were measured in aqueous solution over a range of temperatures.
Abstract: The second-order rate constants for the mercury(II)-catalysed aquation of cis-[Co en2(RNH2)Cl]2+ cations, where R is H, Me, Et, Prn, and Pri, have been measured in aqueous solution over a range of temperatures. The results are discussed in terms of the formation of an activated complex Co–Cl–Hg, which yields the aquo-product by a unimolecular aquation. In the case of R = H, the investigations have been extended to the corresponding bromocation, which reacts some 500 times faster than its chloro-analogue.
6 citations
TL;DR: The application of 139La NMR to study the kinetics of substitution reactions is described and rate constants associated with fast substitution reactions on La3+ complexes in the presence of excess of the aqua‐ion can be obtained by measuring the line widths of the corresponding signals.
Abstract: The application of 139La NMR to study the kinetics of substitution reactions is described. Rate constants associated with fast substitution reactions on La3+ complexes in the presence of excess of the aqua-ion can be obtained by measuring the line widths of the corresponding signals. Measurements as a function of temperature allow the separation of the kinetic and quardrupolar relaxation effects. The rate of aquation of La(2,6-dicarboxy-4-hydroxypyridine)+ was measured in aqueous solution. The dissociation rate constant and the activation parameters obtained for this process are k298r = 207 ± 51 s−1, ΔH = 38.3 ± 3.1 kJ mol−1 and ΔS = −72 ± 8 J K−1 mol−1. The spin–spin relaxation rates of the lanthanum(III) in the two environments are described by 1/T = 550 ± 83 s−1 and EA = 26.4 ± 5.8 kJ mol−1 for the aqua-ion and by 1/T = (2.00 ± 0.08) × 104 s−1 and EB = 16.3 ± 1.6 kJ mol−1 for the mono-complex.
6 citations