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Optical and theoretical investigation of Indian yellow (euxanthic acid and euxanthone)

de Fonjaudran, CM; Acocella, A; Accorsi, G; Tamburini, D; Verri, G; Rava, A; Whittaker, S; ... Saunders, D; + view all (2017) Optical and theoretical investigation of Indian yellow (euxanthic acid and euxanthone). Dyes and Pigments , 144 pp. 234-241. 10.1016/j.dyepig.2017.05.034. Green open access

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Abstract

The optical properties (photophysics and imaging) of Indian yellow were investigated both in solid state and in aqueous solution and correlated with its chemical composition. The analyses were corroborated by a theoretical study carried out on the different xanthone derivatives that comprise the pigment under investigation, both as isolated molecules and in a polar (protic) solvent, to help the assignment of the excited states involved in the photo-induced process. Knowledge of its relatively high photoluminescence quantum yield (PLQY 0.6%), excitation and emission spectra and lifetime decays enhances the potential for reliable identification using non-invasive photo-induced luminescence imaging techniques. New insights into the chemical composition of the pigment, such as the identification of a sulphonate derivative of euxanthone, and its extensive occurrence on a 17th-century Indian wall painting are also reported for the first time in this study.

Type: Article
Title: Optical and theoretical investigation of Indian yellow (euxanthic acid and euxanthone)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.dyepig.2017.05.034
Publisher version: http://doi.org/10.1016/j.dyepig.2017.05.034
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Indian yellow, Photoluminescence spectroscopy, Time-dependent density functional theory calculation, Photoluminescence imaging, Indian wall painting
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Institute of Archaeology
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Institute of Archaeology > Institute of Archaeology Gordon Square
URI: https://discovery.ucl.ac.uk/id/eprint/10065078
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