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Article: Structural and mechanistic studies of co-ordination compounds. Part 17. Preparation and acid hydrolysis of some cobalt(III) complexes containing the quadridentate macrocycle 2,7,12-trimethyl-3,7,11,17-tetra-azabicyclo[11.3.1] heptadeca-1 (17),2,11,13,15-pentaene: An extra-ordinary hydrolysis reaction

TitleStructural and mechanistic studies of co-ordination compounds. Part 17. Preparation and acid hydrolysis of some cobalt(III) complexes containing the quadridentate macrocycle 2,7,12-trimethyl-3,7,11,17-tetra-azabicyclo[11.3.1] heptadeca-1 (17),2,11,13,15-pentaene: An extra-ordinary hydrolysis reaction
Authors
Issue Date1977
Citation
Journal of the Chemical Society, Dalton Transactions, 1977, n. 13, p. 1247-1251 How to Cite?
AbstractThe preparation and characterization of trans-[Co(HL1)X2]+ and [Co(L1)X]+ {HL1 = 2,7,12-trimethyl-3,7,11,17-tetra-azabicyclo[11.3.1] heptadeca-1 (17),2,11,13,15-pentaene L1 = 2,12-dimethyl-3,7,11,17-tetra-azabicyclo-[11.3.1]heptadeca-1(17),2,11,13,15- pentaen-7-ylmethyl, X = Cl or Br} are described. The acid hydrolysis for the release of the first halide from trans-[Co(HL1)X2]+ is too fast to be followed by conventional techniques. The rates of release of the second halide from the corresponding aquahalogeno-complexes have been studied over a range of temperature. The immediate reaction product, [Co(L1)(OH2)]2+, for these two reactions has been shown by X-ray diffraction analysis on its chloro-analogue, [Co(L1)Cl][ClO4]·H2O, to be a distorted octahedral complex in which the N-methyl carbon, after losing one proton, is σ-bonded to the central cobalt(III) ion forming a localized three-membered ring. The mechanisms for these reactions are discussed. The observation that the kinetic ratio kCl: kBr is equal to 2.3 indicates that the softness of the central cobalt(III) ion is enhanced in this HL1 system as compared to that in other complexes of saturated macrocyclic amines.
Persistent Identifierhttp://hdl.handle.net/10722/194202
ISSN
2002 Impact Factor: 3.023
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPoon, C-K-
dc.contributor.authorWan, W-
dc.contributor.authorLiao, SST-
dc.date.accessioned2014-01-30T03:32:18Z-
dc.date.available2014-01-30T03:32:18Z-
dc.date.issued1977-
dc.identifier.citationJournal of the Chemical Society, Dalton Transactions, 1977, n. 13, p. 1247-1251-
dc.identifier.issn1472-7773-
dc.identifier.urihttp://hdl.handle.net/10722/194202-
dc.description.abstractThe preparation and characterization of trans-[Co(HL1)X2]+ and [Co(L1)X]+ {HL1 = 2,7,12-trimethyl-3,7,11,17-tetra-azabicyclo[11.3.1] heptadeca-1 (17),2,11,13,15-pentaene L1 = 2,12-dimethyl-3,7,11,17-tetra-azabicyclo-[11.3.1]heptadeca-1(17),2,11,13,15- pentaen-7-ylmethyl, X = Cl or Br} are described. The acid hydrolysis for the release of the first halide from trans-[Co(HL1)X2]+ is too fast to be followed by conventional techniques. The rates of release of the second halide from the corresponding aquahalogeno-complexes have been studied over a range of temperature. The immediate reaction product, [Co(L1)(OH2)]2+, for these two reactions has been shown by X-ray diffraction analysis on its chloro-analogue, [Co(L1)Cl][ClO4]·H2O, to be a distorted octahedral complex in which the N-methyl carbon, after losing one proton, is σ-bonded to the central cobalt(III) ion forming a localized three-membered ring. The mechanisms for these reactions are discussed. The observation that the kinetic ratio kCl: kBr is equal to 2.3 indicates that the softness of the central cobalt(III) ion is enhanced in this HL1 system as compared to that in other complexes of saturated macrocyclic amines.-
dc.languageeng-
dc.relation.ispartofJournal of the Chemical Society, Dalton Transactions-
dc.titleStructural and mechanistic studies of co-ordination compounds. Part 17. Preparation and acid hydrolysis of some cobalt(III) complexes containing the quadridentate macrocycle 2,7,12-trimethyl-3,7,11,17-tetra-azabicyclo[11.3.1] heptadeca-1 (17),2,11,13,15-pentaene: An extra-ordinary hydrolysis reaction-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/DT9770001247-
dc.identifier.scopuseid_2-s2.0-37049091584-
dc.identifier.issue13-
dc.identifier.spage1247-
dc.identifier.epage1251-
dc.identifier.isiWOS:A1977DP32500004-

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