Luminescent Organic Gels Based On Platinum(?) Complexes And N-graphene Quantum Dots

Supramolecular gels,as one of functional soft materials,may be responsive to external effects such as temperature,ultrasound,vibration,and light.The platinum(?)complexes hardly emit light in dilute solutions,but under the condition of stacking action of Pt···Pt and?-?,their fluid solution and solid can exhibit strong luminescence properties.Nitrogen-doped graphene quantum dots(N-GQDs)received attentions for their good solubility in aqueous solutions and strong luminescence properties.Therefore,how to prepare N-GQDs and platinum(?)complexes into soft materials with multifunctional response has attracted our attention.In this thesis,a series of composite materials based on N-GQDs and platinum(?)complexes were prepared via electrostatic interaction,and their gel properties and luminescence properties in selective solvents were discussed.(1)N-GQDs with excellent dispersion and strong luminescence were prepared.A series of materials were synthesized containing different mass of the surfactant dioctadecyldimethylammonium bromide(DODA)via electrostatic interaction.The fluorescence emission of these materials gradually occurred red-shift from blue to yellow in dichloromethane solution with increasing of the content of N-GQDs.The composite material could self-assemble into gels with flower-like structures in dodecane,and show temperature-responsive characterization.(2)Two anionic surfactants(S_? and S_?)with sulfonic acid as the head and tris(dodecyl)hydrophobic chain as the tail were synthesized.They were combined with cationic platinum(?)complexes(1)with hydrophilic chains by electrostatic interaction to form two complexes(S_?-1 and S_?-1).These complexes could self-assemble into gels with red fluorescent and sheet-like structures in selective solvents.The self-assembling process resulted from Pt···Pt,?-?stacking and alkyl chain interactions.In addition,the gels presented a certain temperature response,which demonstrated that sol-gel transition was stably occurred during heating and cooling.(3)Cationic platinum(?)complexes(2)containing hydrophobic chain tris(dodecyl)were synthesized.They were electrostatically immobilized to opposite charged N-GQDs to form materials.The fluorescence emission of these materials presented red-shift from yellow to orange-red in chloroform solution with increasing concentration.And the self-assembled gels display properties of lamellar structure,strong yellow fluorescence,temperature responsive and excellent stability owing to Pt···Pt and?-?interactions.