Diarylethene photochromic dyes

Figure 40.6 Structures and processes involved in the photochromism of the different photo-chromic dyes (diarylethenes, fulgides, azobenzenes, spiropyrans, spirooxazines, and naphtho-pyrans). The colors of the different states of the photochromic dyes are showed.

Corredor CC, Huang Z, Belfield KD (2006) Two-photon 3D optical data storage via fluorescence modulation of an efficient fluorene dye by a photochromic diarylethene. Adv Mater 18 2910-2914... 

Wang also prepared compound 45 in which two UPy units are connected with a photochromic dithienylethene unit [112]. It exists as a cyclic monomer at low concentrations and undergoes concentration-dependent ring-opening polymerization process (Fig. 1.13). To explore the potential applications of the supramolecular polymer, a small amount of mono-UPy-terminated fluorescent dye FI was added to a solution of 45 to end-cap the linear polymer and then the mixture was spin coated to fabricate a smooth mixed film. The closed form of the diarylethene can absorb... 

Several photochromes of different structures (diarylethene and spirobenzopyran) were encapsulated in PS matrices to form composite nanoparticles with diameters between 70 and 150 nm [31], TEM images did not show phase-separated dye crystals in the nanoparticles. Hybrid films were prepared by spin-coating and investigated for their photochromic properties. After UV irradiation, the films changed their color according to the embedded photochrome. The reversibility of this process was shown by irradiation with light of 500-650 nm, which reinstalled the original state. 

S. Murase, M. Teramoto, H. Furukawa, Y. Miyashita, K. Horie, Photochemically induced fluorescence control with intermolecular energy transfer from a fluorescent dye to a photochromic diarylethene in a polymer film. Macromolecules 36, 964—966 (2003)... 

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