Photochromic properties of hydrolysed benzopyrylium salts—the influence of bridging

Wünscher, Heike; Haucke, G.; Czerney, Peter

doi:10.1016/s1010-6030(02)00237-x

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…13) has been examined. 45 Photochromic reactions were observed for most of non-bridged flavylium salts and those which contain a (CH 2 ) 2 -bridge between the 3-and 2Ј-positions. However, all CH 2 -bridged benzopyrylium cations undergo irreversible hydrolysis reactions, and do not show any photochromism.…”

Section: Methodsmentioning

confidence: 98%

8 Photochromism

Kobatake

Irie

2003

Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.

113

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Section: Methodsmentioning

confidence: 98%

8 Photochromism

Kobatake

Irie

2003

Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.

113

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“…2-Hydroxychalcone has been known as a photochromic compound that is converted by UV irradiation to the colored flavylium form [1][2][3][4][5][6]. The mechanism of the photochromic reaction is shown in Scheme 1 [1].…”

Section: Introductionmentioning

confidence: 99%

Photo-induced coloration of 2-hydroxychalcone in the clay interlayer

Kohno

Ito

Kurata

et al. 2011

Journal of Photochemistry and Photobiology A: Chemistry

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2-hydroxychalcones are known to be converted to the colored flavylium form under UV irradiation. In this study, the photochemical conversion of two 2-hydroxychalcone derivatives (4'-dimethylamino-2-hydroxychalcone and 4'-methoxy-2-hydroxychalcone) has been carried out in the solid matrix by the intercalation into the layer of the clay, montmorillonite. The 2-hydroxychalcone has been adsorbed on the clay by modifying the clay interlayer with a cationic surfactant, dodecyltrimethylammonium chloride. The addition of an acidic compound (benzenesulfonic acid) has induced the successful coloring reaction of the 2-hydroxychalcone derivatives by the conversion to the flavylium under UV irradiation between the clay interlayer. A delayed coloration has been observed on the short time irradiation of 4'-methoxy-2-hydroxychalcone included in the clay layer.

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“…However, the stability of FV is known to be poor FV easily undergoes transformation to a colorless 2-hydroxychalcone under slightly basic or heated conditions [1][2][3][4][5][6] . As shown in , the decoloration process starts by the hydration of FV caused by the attack of water or hydroxyl ion to give a colorless hemiacetal, followed by the conversion to the 2hydroxychalcone derivatives 7 .…”

mentioning

confidence: 99%

Stabilization of Flavylium Dye by Incorporation into Bentonite Clay

Kohno¹,

Hoshino²,

Ikoma³

et al. 2010

Journal of the Japan Society of Colour Material

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UV-Vis spectra of FV/BN with different amounts of FV. Loading amounts of FV were a 0.01, b 0.03, c 0.12, d 0.25, e 0.50, f 0.75, g 1.00 and h 1.25 mmol/g, respectively. The absorbance was normalized at respective λmax. Fluorescence emission spectra of A FV aqueous solution 1.0 10 4 M and B FV/BN samples. The amounts of FV loading are a 0.01, b 0.03, c 0.12, d 0.25, e 0.50 mmol/g, respectively. Excitation light was 470 nm.

show abstract

Photochromic properties of hydrolysed benzopyrylium salts—the influence of bridging

Cited by 10 publications

References 18 publications

8 Photochromism

8 Photochromism

Photo-induced coloration of 2-hydroxychalcone in the clay interlayer

Stabilization of Flavylium Dye by Incorporation into Bentonite Clay

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