Supramolecular Self-Assemblies Based On Charge Transfer Interactions And Their Multi-Responsive Properties

The ?-electron charge transfer(CT)interaction,which originates from an electronic transition from the donor to the acceptor,is a kind of ?-? interactions.Owing to changes in energy,it is always followed by obvious changes in color and spectra when donor-acceptor complexes form and disassemble,which makes CT systems good candidates in responsive materials.However,the CT interaction is a little weak and it is usually assisted with other non-covalent bonds,such as hydrogen bonding and electrostatic forth,to assemble to desired structures.Majorly owing to the auxiliary non-covalent interactions that impair the authentic responsive performance of the intrinsic CT interactions,there are no researches about the real responsive reactions just relay on CT interactions reported.In order to address the problem,we employ donortype triphenylene(TP)and acceptor-type hexaazatriphenylene triimide(HAT),which can form stable complex through CT interactions.We studied the CT interaction between TP and HAT,researched the self-assembly behavior of TP-HAT complex in solution and explored the multi-response of the TP-HAT gels.1.We synthesized the TP and HAT derivatives firstly.Then,the CT interaction between TP and HAT was studied and the association constant of TP-HAT complex was calculated.In the end,the self-assembly of donor molecules and the co-assembly of donor-acceptor complex in solution were researched.2.We explored the multi-response of the TP-HAT gel.Firstly,the gelation process of TP-HAT gel was studied.Then,thermal response and sonication response were subsequently studied.Next,a sieries of chemical componds as stimuli,which span from low-polarity molecules to high-polarity molecules including normal solvents,alcohols,acids and amines,were researched in details.In this part,UV-Vis spectra,NMR and AFM were applied to characterize the changes in experiments.This work provides a deeper insight into the feature of CT interactions.Hopefully,these findings would be helpful for modulating the performance of other CT complex materials.