Organic/inorganic hybrid pigments from flavylium cations and palygorskite

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dc.contributor.authorSilva, Gustavo Thalmer M.
dc.contributor.authorSilva, Cassio P.
dc.contributor.authorGehlen, Marcelo H.
dc.contributor.authorOake, Jessy
dc.contributor.authorBohne, Cornelia
dc.contributor.authorQuina, Frank H.
dc.date.accessioned2020-07-22T20:17:10Z
dc.date.available2020-07-22T20:17:10Z
dc.date.copyright2018en_US
dc.date.issued2018
dc.description.abstractFeatures such as color, brightness and fluorescence are extremely important in applications of pigments. Hybrid materials inspired by the ancient Maya Blue pigment are a promising alternative to improve the properties and applicability of natural and synthetic dyes. In this work, we report the preparation, photophysical properties, and stability of several fluorescent hybrid pigments based on flavylium cations (FL) adsorbed on palygorskite (PAL). Five flavylium cations were investigated, viz., the 3′,4′,7-trimethoxyflavylium (FL1), 7-hydroxy-4′-methoxy-flavylium (FL2), 7-hydroxy-4-methylflavylium (FL3), 5,7-dihydroxy-4-methylflavylium (FL4) and 7-methoxy-4-methylflavylium (FL5) cations. Only FL1 and FL2, without a methyl substituent at the 4-position that could hinder inclusion in palygorskite channels, adsorbed strongly on PAL, producing fluorescent hybrid pigments with attractive colors. The spectroscopic and fluorescence properties of the FL1/PAL and FL2/PAL hybrid pigments were characterized. The color of the adsorbed dyes was somewhat more resistant to changes in external pH, photochemical stability was maintained and the thermal lability was markedly improved in the FL/PAL hybrid pigments, pointing to flavylium cations as promising chromophores for the development of fluorescent hybrid pigments with attractive colors.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThe authors thank the CNPq (F.H.Q. Universal grant 408181/2016-3), INCT-Catálise, and NAP-PhotoTech for the support, the CNPq for a research productivity fellowships (F.H.Q. and M.H.G.), and CAPES for graduate fellowships (G.T.M.S. and C.P.S.). Researchers at UVic thanks NSERC (RGPIN-2017-04458) for funding and CAMTEC for the use of shared facilities. The authors thank Josué M. Gonçalves for assistance in determining the X-ray diffractograms and Dr. Thiago Lewis Reis Hewer, Dept. of Chemical Engineering, Polytechnic School, USP, for performing the N2 sorption measurements.en_US
dc.identifier.citationSilva, G. T. M., Silva, C. P., Gehlen, M. H., Oake, J., Bohne, C., & Quina F. H. (2018). Organic/inorganic hybrid pigments from flavylium cations and plygorskite. Applied Clay Science, 162, 478-486. https://doi.org/10.1016/j.clay.2018.07.002.en_US
dc.identifier.urihttps://doi.org/10.1016/j.clay.2018.07.002
dc.identifier.urihttp://hdl.handle.net/1828/11953
dc.language.isoenen_US
dc.publisherApplied Clay Scienceen_US
dc.subjectfluorescent hybrid pigmentsen_US
dc.subjectpalygorskitesen_US
dc.subjectdyesen_US
dc.subjectclaysen_US
dc.subjectflavylium cationsen_US
dc.subjectcoloren_US
dc.titleOrganic/inorganic hybrid pigments from flavylium cations and palygorskiteen_US
dc.typePostprinten_US

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