Aquation and Base Hydrolysis of trans-Tetraammine(methylamine)sulfatocobalt(III) Complex Ion
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Fabian Benzo
Abstract
The kinetics of aquation and base hydrolysis reactions of fmns-[Co(NH3)4(NH2CH3)(OSO3)]+ have been studied. In acid solution the aquation rate, Raq, follows the equation Raq/[complex] = ks + kc[H+], at constant ionic strenght μ = 1.0Μ. The activation parameters are ΔΗ* = 88.8 kj mol-1, ΔS* = - 50.5 JK-1 mol-1 , ΔΗ* = 96.7 kj mol-1 and ΔS* =-23 JK-1 mol-1. The rate constants at 25°C are ks = 4.15 χ 10-6s-1 and kc = 4.52M -1s-1 . The rate of base hydrolysis, ROH, follows the equation ROH/complex] = k0H [OH-]. The activation parameters are ΔΗ*OH =74.9kJmol-1 and ΔS*OH = 2JK-1 mol-1 and the rate constant is kOH = 0.58M 1 s-1 at 25°C and μ, = 0.15 Μ. The stereochemistry of the hidroxo product has been determined (cis-[Co(NH3)4(NH2CH3)- (OH)]2+ =9%). The results are discussed in the light of the reaction mechanisms proposed so far.
© 2014 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Hypochlorite Oxidation of a Chromium(III) Schiff Base Complex
- Theoretical Estimates of Association Constants for Contact Triple-Ion Formation
- Inner Sphere Reduction of Tris(pyridine-2- carboxylato)manganese(III) by Hydroxylammonium Ion in Sodium Picolinate-Picolinic Acid Buffer Media
- The Complex Aqueous Chemistry of RUC12(TPPTS)3 and its Reaction with Dihydrogen
- Substitution Reactions of Platinum(II) Dipicolinate Complex with Some Mono- and Bidentate Ligands - Rates and Mechanism
- Kinetics and Mechanism of Oxidation of Azide Ion by 12-Tungstocobaltate(III), [CoW12O40]5-, Ion
- Osmium(VIII) Catalysed Oxidation of Thiocyanate by Periodate in Aqueous Alkaline Medium
- Kinetics and Mechanism of the Reactions of Bis(biguanide)copper(II) Ion with Different Amino Acids in Aqueous Media
- Keywords: Kinetics, copper(II), biguanide, amino acids, associative mechanism
- Aquation and Base Hydrolysis of trans-Tetraammine(methylamine)sulfatocobalt(III) Complex Ion
- Notes for Contributors. Inorganic Reaction Mechanisms
- Instructions for Authors
- Disk Specifications
Articles in the same Issue
- Hypochlorite Oxidation of a Chromium(III) Schiff Base Complex
- Theoretical Estimates of Association Constants for Contact Triple-Ion Formation
- Inner Sphere Reduction of Tris(pyridine-2- carboxylato)manganese(III) by Hydroxylammonium Ion in Sodium Picolinate-Picolinic Acid Buffer Media
- The Complex Aqueous Chemistry of RUC12(TPPTS)3 and its Reaction with Dihydrogen
- Substitution Reactions of Platinum(II) Dipicolinate Complex with Some Mono- and Bidentate Ligands - Rates and Mechanism
- Kinetics and Mechanism of Oxidation of Azide Ion by 12-Tungstocobaltate(III), [CoW12O40]5-, Ion
- Osmium(VIII) Catalysed Oxidation of Thiocyanate by Periodate in Aqueous Alkaline Medium
- Kinetics and Mechanism of the Reactions of Bis(biguanide)copper(II) Ion with Different Amino Acids in Aqueous Media
- Keywords: Kinetics, copper(II), biguanide, amino acids, associative mechanism
- Aquation and Base Hydrolysis of trans-Tetraammine(methylamine)sulfatocobalt(III) Complex Ion
- Notes for Contributors. Inorganic Reaction Mechanisms
- Instructions for Authors
- Disk Specifications
