Studies On The Design, Synthesis And Photoelectric Properties Of A Novel Calss Of Heterocyclic Compounds Containing F And B Atoms

Organic fluorine-boron coordination compounds have been one of the most active research areas because of their high quantum yields and stability in potential application of light emitting diodes (LEDs). Recent years, kinds of organic fluorine-boron coordination compounds have been synthesized and been used in the field of LEDs, which attracted considerable attentions.In this work, a series of new nitrogen-containing fluorine-boron coordination compounds have been designed and synthesized. The crystal, optical and electrochemistry properties have been studied to explore the applications of these compounds in Organic Light Emitting Diode (electron-transport materials and luminescent materials).Nine novel N^N-Boron-Fluorine coordination complexes (A1-A9) are designed and efficiently synthesized. Baced on the optical properties of A1 and A2, we can see that these compounds exhibit intensive fluorescence in both solid and solution, and their solid fluorescence intensity are much stronger than that of BODIPY. Meanwhile, the electrochemistry properties of compound A1 and A2 show that their LUMO levels are even lower than that of the most widely used charge-transport material Alq₃. Crystals of A1-A5 are obtained by direct diffusion of ether into a solution of them in dichloromethane, respectively. According to the study of intermolecular interactions and crystal packing, it suggests that the accepting ability of F atom has been improved in these B-F complexes.Five novel N^O-Boron-Fluorine coordination complexes (B1-B5) have been designed and synthesized. The fluorescent intensities of B1-B5 are low, but the good electron-accepting features make them more promising in practical applications as charge-transport materials. Crystals are obtained and the crystal packings of these crystals are discussed. In B5, kinds of intermolecular interactions involving F atoms are observed which are the major influencing factor for molecular packing. This multifluorinated complex also exhibited much stronger electron-acceptor ability compared with the nonfluorinated reference (B2).