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  • 1
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the complex formation between oxalatopentaamminecobalt(III) and aluminium(III) and gallium(III); a comparative study (1995)
    Springer
    Transition metal chemistry 20 (1995), S. 153-156 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The reversible complex formation between oxalatopentaammine cobalt(III), aluminium(III) and gallium(III) was investigated by the stopped flow technique at 30 ± 0.1 °C and I = 1.0 mol dm−3. The reactivity sequence: GaIII 〉 AlIII is observed, however, the major path for gallium(III) was (NH3)5CoC2O4H2+ + GaOH2+ →(NH3)5CoC2O4-Ga4+ + H2O. The formation and dissociation rate constants of the binuclear species have been compared with the analogous data for iron(III) and nickel(II) reported earlier. The results reflect the fact that the half-bonded exalato moiety of (NH3)5CoC2O inf4 p+ acts as a chelating agent for the metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167019
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of complex formation between beryllium(II) and the 3-nitrosalicylatopentaamminecobalt(III) ion (1995)
    Springer
    Transition metal chemistry 20 (1995), S. 406-408 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The kinetics of formation and dissociation of the binuclear complex of Be2+ with 3-nitrosalicylatopentaamminecobalt(III) have been investigated in the 20–40 and 25–40 °C ranges (I = 0.3 mol dm −3), respectively. At 25 °C the rate and activation parameters for the formation of the binuclear species are: k f = 26.9 × 102 dm3mol−1s−1, ΔH ≠ = 104 ± 7kJ mol−1 ΔS ≠= 91 ± 22JK−1mor−1.The rate constant, activation enthalpy and activation entropy for the acid-catalysed dissociation of the binuclear species are: 1.25 ± 0.08dm3mol −1 at 25 °C, 53 ± 3kJ mol−1 and - 67 ± 9 J K −1 mol−1, respectively. The formation of the binuclear species is chelation controlled while the dechelation is acid catalysed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00139142
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of base hydrolysis ofO-bonded pentaammineglycinatocobalt(III) and pentaammine-β-alaninatocobalt(III) ions (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 338-339 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The kinetics and mechanism of the base hydrolysis ofO-bonded pentaammineglycinatocobalt(III) and pentaammine-β-alaninatocobalt(III) ions have been studied spectrophotometrically in the 35–50 °C range, [OH−]T=0.025–0.1026 mol dm−3 and I=0.3 mol dm−3. The rate law was found to be as shown. (1) $$\frac{{ - dln[complex]_T }}{{dt}} = k_2 [OH^ - ]$$ In this expression k2(35 °C)=8.0 ± 0.7 × 10−4 dm3 mol−1 s−1 (ΔH
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01036396
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the reaction of aquachromium(III) with l-ascorbic acid in aqueous media (1997)
    Springer
    Transition metal chemistry 22 (1997), S. 516-520 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The kinetics of the reaction of l-ascorbic acid (H2A) with aquachromium(III) has been studied over the range 0.04 ≤ [H2A]T ≤ 0.16 mol dm−3, 3.5 ≤ pH ≤ 6.0, 25.0 ≤ t ≤ 50.0∘C, 0.03 ≤ I ≤ 1.0 mol dm−3 (KNO3) and 0% ≤ [MeOH] ≤ 20% (v/v). The reaction takes place via an outer-sphere association between Cr3+/CrOH2+ and H2A, followed by transformation of the outer- into an inner-sphere complex by slow interchange. The anation rate constants for Cr3+ and CrOH2+ species (k1 and k2) at 25∘C and I=1.0moldm−3 (KNO3) are 1.68×10−4 and 2.14×10−4s−1, respectively. ΔH
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018579700786
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of reaction of trans-(diaqua)(N,N′-ethylene-bis-salicylidenimine) chromium(iii) with sulfur(iv): The labilizing effect of coordinated sulfite (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 30 (1998), S. 373-384 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of trans-[Cr(Salen)(OH2)2]+ with aqueous sulfite yields trans-[Cr(Salen)(OH2)(OSO2(SINGLEBOND)O)]- (O-bonded isomer). The rate and activation parameter data for the formation of the sulfito complex are consistent with a mechanism involving rate-limiting addition of SO2 to the CrIII(SINGLEBOND)OH bond. The complex ions, trans-[(OH2)Cr(Salen)(OSO2(SINGLEBOND)O)]-, and trans-[(OH)Cr(Salen)(OSO2(SINGLEBOND)O)]2-, undergo reversible anation by NCS-, N3-, imidazole, and pyridine resulting in the formation of trans-[XCr(Salen)(OSO2(SINGLEBOND)O)](N+1)-(n=1 for X=N3-,NCS-, and 0 for X=imidazole and pyridine) predominantly via dissociative interchange mechanism. The labilizing action of the coordinated sulfite on the trans-CrIII-X bond in trans-[XCr(Salen)(OSO2)](n+1)- follows the sequence: NCS-pyridine ca. N3- ca. imidazole. Data analysis indicated that the coordinated sulfite has little trans activating influence. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet 30: 373-384, 1998
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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