High‐Content Pendant Photochromic Copolymer with Dithienylethene/Fluorene 2:1 Mole Ratio

Abstract

Summary: Two photochromic dithienylethene units were incorporated into one fluorene unit as a monomer and the mole ratio of photochromic unit/repeat unit reached to 2:1 using this monomer. The content of dithienylethene component in the polymer could be improved effectively by polymerization of this monomer, which contains more than one dithienylethene units. All the starting materials concerned in the synthesis are commercially available and so the synthesis could be performed on a large scale. The polymer obtained by typical palladium‐catalyzed Suzuki coupling reaction is photochromic both in solution and in solid state and possesses good solubility. The photochromic and photomodulation luminescence properties of the polymer are also presented.

Optical Modulation of Amplified Emission in a Polyfluorene–Diarylethene Blend

“…Due to the spectral overlap existing between the ASE spectrum from F8BT and the absorption from DTP-B, we conjecture that quenching is due to energy transfer from the fluorene moiety [19] to the B form of DTP. As shown in Figure 2, ASE in the blend gets completely quenched, while PL stays almost unaffected.…”

Crystal structure of (4-(3,4-bis(2,5-dimethylthiophen-3-yl)- cyclopent-3-en-1-yl)phenyl)methanol, C24H26OS2

“…Source of material (4-(3,4-bis(2,5-dimethylthiophen-3-yl)cyclopent-3-en-1-yl)-phenyl)methanol was synthesized by multi-step reaction [1]. Chemicals used for the synthesis were commercially available of AR grade, and were used as received without further purification.…”

Synthesis and characteristics of a novel pseudorotaxane with the diarylethene as the functional stopper

“…UVevis spectra were performed on a Varian Cary 100 spectrophotometer (1 cm quartz cell used). The preparation of compound 2 was reported previously [40].…”