<i>In Situ</i>
            Synthesis of Azo Dyes and Spiropyran Dyes in Faujasites and their Photochromic Properties

Wöhrle, Dieter; Schomburg, Carsten; Rohlfing, Yven; Wark, Michael; Schulz‐Eckloff, Günter

doi:10.1002/3527602674.ch2

Host‐Guest‐Systems Based on Nanoporous Crystals 2003

DOI: 10.1002/3527602674.ch2

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In Situ Synthesis of Azo Dyes and Spiropyran Dyes in Faujasites and their Photochromic Properties

Dieter Wöhrle

Carsten Schomburg²,

Yven Rohlfing³

et al.

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2009

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Tuning the Thermal Relaxation of a Photochromic Dye in Functionalized Mesoporous Silica

Mühlstein

Sauer²,

Bein

2009

Adv Funct Materials

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In this study, it is shown that the kinetics of the back‐switching reaction of a photochromic spirooxazine dye encapsulated in mesoporous silica materials can be significantly influenced both by the space available to the dye molecules and by the functionalization of the silica wall. Steric hindrance of the ring‐closing process due to high dye content or small pore size leads to a slow fading speed of the irradiated dye species. Further, the density of surface silanol‐groups present at the silica walls has an effect on the switching behavior of the dye because of their ability to stabilize the zwitterionic merocyanine isomers, thereby slowing the fading process from the open to the closed form. This stabilization effect is further enhanced in the presence of acidic functional groups, while, in contrast, basic functional groups reduce the stabilization of the open‐from dye isomers, and thus a faster decay of the irradiated species is observed. Control over the fading speed of photochromic dyes is interesting for applications requiring a particularly fast or slow fading speed.

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Tuning the Thermal Relaxation of a Photochromic Dye in Functionalized Mesoporous Silica

Mühlstein

Sauer²,

Bein

2009

Adv Funct Materials

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show abstract

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In Situ Synthesis of Azo Dyes and Spiropyran Dyes in Faujasites and their Photochromic Properties

Cited by 1 publication

References 0 publications

Tuning the Thermal Relaxation of a Photochromic Dye in Functionalized Mesoporous Silica

Tuning the Thermal Relaxation of a Photochromic Dye in Functionalized Mesoporous Silica

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