Synthesis And Self-Assembly Of BTA Core Rigid-Flexible Molecules With AIE Effect

Aggregation-induced emission(AIE),a crucial feature in luminescence research,which can offer broader application range for fluorescent molecules and therefore raised a lot of interests.Nowadays,the general method forming AIE fluorescent dyes is to add AIE function groups in the structure of molecules.In this thesis,we have designed and synthesized a group of amphipathic rod-coil molecule 1-4,although there is no AIE sections in their structures,these molecules shows AIE effect.After found out a synthetic route and confirmed the structure of products,what we concerned next is how the molecules self-assembled.Experimental results exhibits that all four kinds of molecule go down a conversion from solid phase to liquid phase during heated.Except molecule 1 has a low crystallinity so that cannot be resolved,molecule 2 self-assembles into tetragonal perforated lamellar(TPL)meanwhile molecule 3 and 4 into body-centered tetragonal micellar phase.In aqueous solution,these molecules express macroscopic chirality even without any chiral additives.Molecule 1 and 2 self-assemble into nanospheres attributed to less hydrophilic parts.Under the same conditions,3 and 4,whose length of hydrophilic segment is twice as 1 and 2,self-assembly process is phased.Molecule 3 self-assembles smaller spherical shape first,then become nanoribbons and a sheet-like structure with holes.Under the induction of molecular chirality,molecule 4 rapidly assembled from spherical shape into short nanorods,eventually forming irregular nanofibers.