New thermally stable cyano-substituted D–A–π–A–D molecules with aggregation-induced emission and large two-photo absorption cross-sections
作者:Wei Huang、Haitao Zhou、Bo Li、Jianhua Su
DOI:10.1039/c2ra22464j
日期:——
In this work, we have designed and synthesized a series of aggregation-induced emission active compounds (4aâc) via Suzuki coupling reaction. Their one and two-photon absorption properties have been investigated. These compounds exhibit high thermal stability, losing only 5% of their weights when heated to 482â503 °C in air. All compounds are quite weakly fluorescent in THF, while a significant AIE effect is observed in water/THF (v/v 70%/30%) mixtures with a sharp increase in fluorescence intensity (about 86, 42, and 103 times, orange, deep yellow and green, respectively). The solid fluorescence of 4aâc is located at 590, 579 and 547 nm, and their ΦF values are determined to be 9.2%, 2.4%, and 14.5%, respectively. Besides, the two-photon absorption (2PA) cross-sections of 4aâc were also measured by open aperture Z-scan technique, at the wavelength of 800 nm. The excellent aggregation-induced emission and 2PA cross-sections properties of 4aâc promote them as attractive candidates for biophotonic materials.
在这项工作中,我们通过铃木偶联反应设计并合成了一系列聚集诱导发射活性化合物(4aâc)。我们研究了它们的单光子和双光子吸收特性。这些化合物具有很高的热稳定性,在空气中加热至 482â503 °C 时仅损失 5%的重量。所有化合物在四氢呋喃中的荧光都很微弱,而在水/四氢呋喃(v/v 70%/30%)混合物中,观察到了显著的 AIE 效应,荧光强度急剧增加(约为 86、42 和 103 倍,分别为橙色、深黄色和绿色)。4aâc 的固体荧光位于 590、579 和 547 纳米波长处,其δF 值分别为 9.2%、2.4% 和 14.5%。此外,4aâc 的双光子吸收(2PA)截面也是通过开孔 Z 扫描技术在 800 纳米波长下测量的。4aâc 卓越的聚集诱导发射和双光子吸收截面特性使其成为生物光子材料的理想候选材料。