Detection of singlet oxygen generated by commercial fine art organic pigments by means of a novel, robust chemical probe
Highlights
► We develop an original methodology for the detection of singlet oxygen. ► The methodology is based on oxo-ene reaction with inexpensive dicyclopentadiene. ► The method requires simple operations and equipment. ► The method was applied to test 15 modern organic pigments employed in fine arts. ► Pigments either inhibit the oxygen reactivity, or produced singlet oxygen.
Section snippets
Experimental
All reagents were used as purchased by suppliers without any further purification. Water colours were obtained from Maimeri S.p.A. Gas-chromatographic analysis were performed using a 15 m length, 025 mm i.d. column with 5% polydiphenysiloxane/95% polydimethylsiloxane 0.25 μm thick stationary phase, constant nitrogen flow 1.0 mL/min. Detector: FID. Linear correlation between product 4 and internal standard (n-tetradecane) was determined before analyses. Temperature ramp: 5 min at 50 °C followed
Acknowledgements
This work was co-founded by MIUR (Rome) within the national PRIN framework.
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Improved synthesis dimethylhomoecoerdianthrone (HOCD) and its functionalization through facile amination reactions
2016, Dyes and PigmentsCitation Excerpt :The intensely blue (in web version) HOCD has a very broad visible absorption spectrum ranging from 500 to 700 nm, which is readily bleached by 1O2 due to the formation of endoperoxide (Fig. 1) [7]. The long wavelength (>600 nm) is preferred for application because it will avoid background interference [8]. However, this property was only used in a limited report for detection of singlet oxygen.
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