Fabian Benzo, Alberto L. Capparelll, D. Mártire, B. Sienra
{"title":"Aquation and Base Hydrolysis of trans-Tetraammine(methylamine)sulfatocobalt(III) Complex Ion","authors":"Fabian Benzo, Alberto L. Capparelll, D. Mártire, B. Sienra","doi":"10.1515/irm-2000-0410","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":8996,"journal":{"name":"BioInorganic Reaction Mechanisms","volume":"26 1","pages":"319 - 324"},"PeriodicalIF":0.0000,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"BioInorganic Reaction Mechanisms","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1515/irm-2000-0410","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
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.