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- W2149708111 abstract "A full kinetic study has been made of the reaction of Cr2+ with hexa-aquocobalt(III), [H+]= 0·10–3·0M, µ= 3·0M(LiClO4). The rate law is of the form –d[CoIII]/dt=(k1+k2[H+]–1)[Cr2+][CoIII] and at 25 °C : k1= 1·25 × 104| mol–1 s–1, ΔH1‡= 9·5 ± 0·4 kcal mol–1, ΔS1‡=–7·8 ± 1·5 e.u.; k2= 6·59 × 103 s–1, ΔH2‡= 12·7 ± 0·6 kcal mol–1, ΔS2‡= 1·7 ± 2·0 e.u. Chloride ions catalyse the reaction and the products CrCl2+ and Cr3+ were determined quantitatively after ion-exchange separation. The formation of CoCl2+ proceeds relatively slowly and it was possible to identify two chloride-dependent terms, k3[Cr2+][CoCl2+] and k4[Cr2+][Co3+][Cl–]. The reaction of V2+ with hexa-aquocobalt(III) was too fast to study directly. Competition studies indicated a rate constant kvca. 8·8 × 105| mol–1 s–1 at 25 °C and µ= 3·0M(HClO4)." @default.
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- W2149708111 date "1972-01-01" @default.
- W2149708111 modified "2023-10-18" @default.
- W2149708111 title "Chromium(II) and vanadium(II) reductions of hexa-aquocobalt(III) in aqueous perchlorate media" @default.
- W2149708111 doi "https://doi.org/10.1039/dt9720001838" @default.
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