State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China.
Langmuir. 2009 Aug 4;25(15):8395-9. doi: 10.1021/la8035727.
A new salicylideneaniline-based organogelator has been synthesized, and it can gelatinize organic solvents, including cyclohexane, toluene, benzene, and some mixed solvents. SEM images show that it has self-assembled into 1-D nanofibers, which further cross-link to form 3-D network. On the basis of the results of small-angle XRD and the optimized molecular length by semiempirical quantum calculations, the gelators are supposed to pack into a unimolecular lamellar structure with a period of 3.01 nm. Significantly, reversible chromism is realized with respect of the tautomerism between the NH and OH forms during the sol-gel freezing repetition. Furthermore, the gel can emit intense green light, and the fluorescent quantum yield of the gel is approximately 600 times higher than that of the solution. The aggregation-induced emission enhancement is ascribed to the formation of J aggregation and the inhibition of intramolecular rotation in the gel state.
一种新型水杨醛苯胺基有机凝胶剂已被合成，它可以使包括环己烷、甲苯、苯和一些混合溶剂在内的有机溶剂凝胶化。SEM 图像表明，它已经自组装成 1-D 纳米纤维，进一步交联形成 3-D 网络。基于小角 XRD 的结果和半经验量子计算优化的分子长度，凝胶剂被认为是用一个周期为 3.01nm 的单分子层状结构包装的。值得注意的是，在溶胶-凝胶冷冻重复过程中，NH 和 OH 形式之间的互变异构实现了可逆变色。此外，该凝胶可以发射强烈的绿光，凝胶的荧光量子产率比溶液高约 600 倍。聚集诱导发光增强归因于 J 聚集的形成和凝胶状态下分子内旋转的抑制。
