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Solid-state study of the structure and host-guest chemistry of cucurbituril-ferrocene inclusion complexes

2016Journal article Restricted access
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dc.contributor.authorGomes, Ana C.
dc.contributor.authorMagalhães, Clara I. R.
dc.contributor.authorOliveira, Tânia S. M.
dc.contributor.authorLopes, Andre D.
dc.contributor.authorGonçalves, Isabel S.
dc.contributor.authorPillinger, Martyn
dc.date.accessioned2017-04-07T15:57:25Z
dc.date.available2017-04-07T15:57:25Z
dc.date.issued2016
dc.description.abstractInclusion complexes of ferrocene (Fc) with cucurbit[n]urils (n = 7, 8) have been prepared via a rapid microwave-assisted hydrothermal approach. Solids were isolated and characterised by elemental analysis, powder X-ray diffraction (PXRD), spectroscopic, and thermoanalytical methods. The UV-Vis spectra support the presence of Fc in Fc@CB7 and a mixture of Fc and ferrocenium ions in Fc@CB8. Partial oxidation of Fc to Fc(+) takes place in situ mainly due to the presence of acid of crystallisation in CB8. On the basis of PXRD, the complex Fc@CB8 is classified into an isostructural series that is formed by several CB8-containing compounds that crystallise in the space group /4(1)/a and have similar unit cell dimensions and CB8 packing motifs. The FT-IR and Raman spectra of Fc@CB7 are compared with those of the CB7 host and the Fc guest starting materials, revealing significant frequency shifts of some Fc-centered vibrational modes upon complexation. Blueshifts of the Fe-Cp stretching and ring tilt bands are attributed to encapsulation of Fc monomers in a constrained environment, leading to restricted motion effects and/or a change in the Fc conformation from staggered to eclipsed. The absence of comparable shifts for Fc@CB8 point to a weaker host-guest interaction as a consequence of the larger cavity size. The different host-guest interactions are also evident through a comparison of the C-13{H-1} CP MAS NMR spectra. Thermogravimetric analysis for the inclusion compounds reveals that sublimation of Fc is inhibited by molecular encapsulation to the extent that oxidative decomposition of the organoiron species takes place concurrently with cucurbituril decomposition, leading to the formation of hematite, alpha-Fe2O3.
dc.identifier.doi10.1039/c6dt02811j
dc.identifier.issn1477-9226
dc.identifier.otherAUT: ADL01681;
dc.identifier.urihttp://hdl.handle.net/10400.1/9707
dc.language.isoeng
dc.peerreviewedyes
dc.publisherRoyal Society of Chemistry
dc.relationCarbon monoxide releasing biomaterials based on layered double hydroxides
dc.relation.isbasedonWOS:000387028500055
dc.titleSolid-state study of the structure and host-guest chemistry of cucurbituril-ferrocene inclusion complexes
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCarbon monoxide releasing biomaterials based on layered double hydroxides
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FCTM%2F50011%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F108541%2F2015/PT
oaire.citation.endPage17052
oaire.citation.issue42
oaire.citation.startPage17042
oaire.citation.titleDalton Transactions
oaire.citation.volume45
oaire.fundingStream5876
person.familyNameD. Lopes
person.givenNameAndré
person.identifier2824636
person.identifier.ciencia-id351E-856A-0300
person.identifier.orcid0000-0002-9702-1216
person.identifier.ridE-2136-2012
person.identifier.scopus-author-id7201958625
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoveryf2f0fe56-e04d-4229-b37b-2b9f1789fe2d
relation.isProjectOfPublicationc25bcc3b-270f-40c4-82d9-cd719c5e0e1d
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