Two-Photon Photochromism of Diarylethene Dimer Derivatives

摘要

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.