Publication
Photochromism of the complex between 40-(2-hydroxyethoxy)-7-hydroxyflavylium and b-cyclodextrin, studied by 1H NMR, UVeVis, continuous irradiation and circular dichroism
| dc.contributor.author | Gago, Sandra | |
| dc.contributor.author | Basílio, Nuno | |
| dc.contributor.author | Fernandes, Ana | |
| dc.contributor.author | Freitas, Victor | |
| dc.contributor.author | Quintas, Alexandre | |
| dc.contributor.author | Pina, Fernando | |
| dc.date.accessioned | 2016-09-28T11:23:02Z | |
| dc.date.available | 2016-09-28T11:23:02Z | |
| dc.date.issued | 2014 | |
| dc.description | 1st International Caparica Conference on Chromogenic and Emissive Materials | pt_PT |
| dc.description.abstract | "The network of chemical reactions of the compound 4′-(2-hydroxyethoxy)-7-hydroxyflavylium and its photochromic properties were studied in the absence and presence of β-cyclodextrin. The system was characterized by 1H NMR, UV–Vis, continuous irradiation and circular dichroism. In the presence of β-cyclodextrin 4.8 mM the pK′a is reduced to 2.2. The association constants with β-cyclodextrin, follow the order trans-chalcone > quinoidal base > flavylium cation, respectively 1.7 × 103 M−1; 5.6 × 102 M−1; ≈0. The rate of inter-conversion of the network species increases in the presence of β-cyclodextrin circa 2.6 times. The appearance of an induced circular dichroism signal of trans-chalcone inside the β-cyclodextrin is described for the first time. It gives information about the position of the guest inside the host and allows the calculation of the respective association constant." | pt_PT |
| dc.identifier.citation | Dyes and Pigments. Volume 110, November 2014, Pages 106–112 | pt_PT |
| dc.identifier.doi | 10.1016/j.dyepig.2014.04.038 | pt_PT |
| dc.identifier.issn | 0143-7208 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/14900 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.publisher | Elsevier | pt_PT |
| dc.relation.publisherversion | http://dx.doi.org/10.1016/j.dyepig.2014.04.038 | pt_PT |
| dc.subject | Flavylium | pt_PT |
| dc.subject | Anthocyanins | pt_PT |
| dc.subject | Photochromism | pt_PT |
| dc.subject | Induced circular dichroism | pt_PT |
| dc.subject | Cyclodextrin | pt_PT |
| dc.subject | Kinetics | pt_PT |
| dc.title | Photochromism of the complex between 40-(2-hydroxyethoxy)-7-hydroxyflavylium and b-cyclodextrin, studied by 1H NMR, UVeVis, continuous irradiation and circular dichroism | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FQUI-QUI%2F117996%2F2010/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F84805%2F2012/PT | |
| oaire.citation.endPage | 112 | pt_PT |
| oaire.citation.startPage | 106 | pt_PT |
| oaire.citation.title | Dyes and Pigments | pt_PT |
| oaire.citation.volume | 110 | pt_PT |
| oaire.fundingStream | 5876-PPCDTI | |
| oaire.fundingStream | SFRH | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| rcaap.rights | restrictedAccess | pt_PT |
| rcaap.type | article | pt_PT |
| relation.isProjectOfPublication | 1fc4fe27-a6a5-4d15-8897-253c14d0abd6 | |
| relation.isProjectOfPublication | 9e5f1dc3-57c8-4ffb-a150-92931d9188c7 | |
| relation.isProjectOfPublication.latestForDiscovery | 1fc4fe27-a6a5-4d15-8897-253c14d0abd6 |