Study On The Fluorescent Probes Of Triphenylamine(TPA) Supramolecular Polymers Modified By Methyl Acrylate

Triphenylamine(TPA) are connected by a pair of lone pair electrons with nitrogen atoms and three aromatic rings,so that the lone pair electrons and three aromatic rings form π-π conjugated,which is widely used in photoelectric materials and hole-transporting materials due to its unique free radicals, larger steric hindrance factors, super conjugate electronic effect and high hole mobility. The periphery of the three aromatic rings,with its high activity, structural diversity,can be appropriately modified characteristics and a series of luminescent materials with specific functions can be produced. This paper has synthesized several supramolecular polymer fluorescent probe of triphenylamine(TPA) derivatives with special forces(C=O…π) and studied on the optical properties, the probe molecular properties. The main research contents of this paper are as follows:1. Design and synthesis of fluorescent molecules with TPA core, which was modified by 4-Hydroxycoumarin and methyl acrylate. The luminescence properties were studied through UV-vis and fluorescence spectroscopy. In solution, these triphenylamine(TPA) derivatives formed supramolecular fluorescence probe by self-assembly for picric acid(PA) and the detection limit and quenching constant KSV were determined respectively. The hydrogen bond between the supramolecular polymer fluorescent probe and PA is the key driving force for the fluorescence quenching. As a result of the existence of the hydrogen bond between molecules, the intermolecular charge transfer is promoted.2. With TPA core, the para position of benzene on connection methacrylate molecules increases the molecular flexibility, but also a phenyl contraposition connection with a larger steric hindrance of the BODIPY unit. Due to the interaction between flexible chain methyl acrylate groups, fluorescent molecules in the mixture of tetrahydrofuran and water shows obvious aggregation induced luminescence phenomena(AIE), and can form a gel in the weak interaction. And the introduction of rigid BODIPY coplanar unit makes it have the advantages of high fluorescence quantum yield, long fluorescence emission wavelength and good light stability. Triphenylamine(TPA) derivatives formed supramolecular fluorescence probe by self-assembly for picric acid(PA) and the detection limit and quenching constant KSV were determined respectively. In addition, we also prepared fluorescent strip, convenient detection of Trace picric acid.