The Synthesis of Novel Coumarin Dyes and the Study of Their Photoreaction Properties

摘要

Coumarin dyes are well known as high efficient sensitizers for photopolymerization. However, till now, all reported two-photon absorbing (TPA) cross-sections of such dyes are small, ～1-50GM, which limit their applications on two-photon polymerization. In this study, a series of novel coumarin derivatives linked with a N, N-dimethylaniline group via cyclopentanonediene on position 4 of the coumarin ring were synthesized and their two-photon absorbing properties were characterized by femtosecond laser pulses. All compounds showed a greatly enhanced. In addition, these dyes showed efficient photopolymerization initiating properties. A self-accelerate phenomenon was observed in their photobleaching process.