Two-photon photochromism of diarylethene dimer derivatives.
Photochromic diarylethene dimer derivatives with large two-photon absorption (TPA) cross-sections have been designed and synthesized. The derivatives have a D-pi-D structure in which indole rings are used as donor units (D) and 1,4-bis(ethynyl)benzene or 1,4-bis(ethenyl)benzene as a pi-conjugated chain unit (pi). Compound 5 a, which has oxazole rings as one of the aryl groups, showed a TPA cross-section of 23 GM at 820 nm and exhibited efficient two-photon photochromic reactivity.
Saita
Shingo
S
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1 Higashi-ku, Fukuoka 812-8581, Japan.
Yamaguchi
Tadatsugu
T
Kawai
Tsuyoshi
T
Irie
Masahiro
M