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Trinuclear Cu-II structural isomers coordination, magnetism, electrochemistry and catalytic activity towards the oxidation of alkanes

2015-08Journal article Restricted access
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dc.contributor.authorSutradhar, Manas
dc.contributor.authorMartins, Luisa
dc.contributor.authorGuedes Da Silva, M. Fátima C.
dc.contributor.authorMahmudov, Kamran
dc.contributor.authorLiu, Cai-Ming
dc.contributor.authorPombeiro, Armando
dc.date.accessioned2016-03-14T15:40:32Z
dc.date.available2016-03-14T15:40:32Z
dc.date.issued2015-08
dc.description.abstractThe reaction of the Schiff base (3,5-di-tert-butyl-2-hydroxybenzylidene)-2-hydroxybenzohydrazide (H3L) with copper(II) nitrate, acetate or metaborate has led to the isomeric complexes [Cu-3(L)(2)(MeOH)(4)] (1), [Cu-3(L)(2)(MeOH)(2)]2MeOH (2) and [Cu-3(L)(2)(MeOH)(4)] (3), respectively, in which the ligand L exhibits dianionic (HL2-, in 1) or trianionic (L3-, in 2 and 3) pentadentate 1O,O,N:2N,O chelation modes. Complexes 1-3 were characterized by elemental analysis, IR spectroscopy, single-crystal X-ray crystallography, electrochemical methods and variable-temperature magnetic susceptibility measurements, which indicated that the intratrimer antiferromagnetic coupling is strong in the three complexes and that there exists very weak ferromagnetic intermolecular interactions in 1 but weak antiferromagnetic intermolecular interactions in both 2 and 3. Electrochemical experiments showed that in complexes 1-3 the Cu-II ions can be reduced, in distinct steps, to Cu-I and Cu-0. All the complexes act as efficient catalyst precursors under mild conditions for the peroxidative oxidation of cyclohexane to cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone, leading to overall yields (based on the alkane) of up to 31% (TON = 1.55x10(3)) after 6 h in the presence of pyrazinecarboxylic acid.pt_PT
dc.identifier.citationSUTRADHAR, Manas; [et al.] - Trinuclear Cu-II structural isomers coordination, magnetism, electrochemistry and catalytic activity towards the oxidation of alkanes. European journal of inorganic chemistry. ISSN. 1434-1948. Vol. 2015, N.º 23 (2015), pp. 3959-3969pt_PT
dc.identifier.doi10.1002/ejic.201500440pt_PT
dc.identifier.issn1434-1948
dc.identifier.issn1099-0682
dc.identifier.urihttp://hdl.handle.net/10400.21/5857
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWiley-V C H Verlag GMBHpt_PT
dc.relation.publisherversionhttp://onlinelibrary.wiley.com/doi/10.1002/ejic.201500440/abstractpt_PT
dc.subjectN,O ligandspt_PT
dc.subjectCopperpt_PT
dc.subjectMagnetic propertiespt_PT
dc.subjectElectrochemistrypt_PT
dc.subjectOxidationpt_PT
dc.titleTrinuclear Cu-II structural isomers coordination, magnetism, electrochemistry and catalytic activity towards the oxidation of alkanespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage3969pt_PT
oaire.citation.issue23pt_PT
oaire.citation.startPage3959pt_PT
oaire.citation.volume2015pt_PT
person.familyNameSutradhar
person.familyNameMartins
person.familyNameGuedes da Silva
person.familyNameMahmudov
person.familyNameLiu
person.familyNamePombeiro
person.givenNameManas
person.givenNameLuisa
person.givenNameM. Fátima C.
person.givenNameKamran
person.givenNameCai-Ming
person.givenNameArmando
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person.identifier.orcid0000-0001-7184-6693
person.identifier.orcid0000-0001-8323-888X
person.identifier.ridM-4089-2013
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person.identifier.scopus-author-id14053084900
person.identifier.scopus-author-id8650947800
person.identifier.scopus-author-id6701761571
person.identifier.scopus-author-id24468352000
person.identifier.scopus-author-id7006067269
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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