Investigating the effects of side chain length on the AIE properties of water-soluble TPE derivatives

The emissive properties of fluorophores in aggregated state are important for the development of biosensors or bio-imaging reagents. So three water-soluble TPE derivatives with different lengths of side chains have been synthesized and we investigated the effects of side chains on aggregation-induced emission (AlE) properties in the aggregated states. The results indicate that side chains on the fluorophores play a pivotal role in their emission in aggregated state mediated by heparin or solid state, because the coplanarity of these TPE derivatives was affected by side chains. The rates of radiative decay k(f) and non-radiative decay k(nr) have been obtained through the quantum yields and lifetime, and a larger k(f) and smaller k(nr) were present for compound TPE-C4N, suggesting that the aggregated TPE-C4N should posses the most remarkable fluorescent property. (C) 2014 Elsevier Ltd. All rights reserved.

荧光团在聚集态下的发射特性对于生物传感器或生物成像试剂的开发非常重要。因此，合成了三种具有不同长度侧链的水溶性四苯乙烯（TPE）衍生物，并研究了侧链对聚集态下聚集诱导发光（AIE）特性的影响。结果表明，荧光团上的侧链在肝素介导的聚集态或固态发光中起着关键作用，因为这些TPE衍生物的共平面性受到侧链的影响。通过量子产率和寿命获得了辐射衰变速率\(k_f\)和非辐射衰变速率\(k_{nr}\)，化合物TPE - C4N具有较大的\(k_f\)和较小的\(k_{nr}\)，这表明聚集态的TPE - C4N应具有最显著的荧光特性。（C）2014爱思唯尔有限公司。保留所有权利。