Synthesis And Properties Of Multi-biphenyl-based Fluorescent Material Structure

In21st century, Organic Light-emitting device has huge prospect in the field ofelectronic digital world and has become a hot area of research. The key problem is howto get fluorescent materials that possess characteristics of easy preparation, high yield,lower cost and good thermal stability. Small molecular fluorescent compounds withmulti-phenyl structure are the best potential fluorescent materials. Thus, synthesis of thesmall molecule fluorescent compounds by different methods is a hot topic in recentresearch.In this work, three types of multi-phenyl fluorescent materials were prepared bythe Suzuki coupling reaction that has mild reaction conditions and easy operation.Structures of these fluorescent materials are a linear-shaped fluorescent material withphenyl group, a star-shaped fluorescent material with phenyl group and a cross-shapedfluorescent material with anthracene group.First, using simple aryl compounds as starting materials, fourteen small moleculesfluorescent compounds of the three types were synthetized through brominations andSuzuki coupling reactions.Secondly, reaction conditions of Suzuki coupling reaction, that were applied toprepare the small molecule fluorescent materials, were optimized including a mole ratioof aryl boronic acid and aryl bromide, reaction temperature, base, reaction solvent,reaction atmosphere, and so on. Twenty-one multi-phenyl aryl compounds weresynthetized by the optimized reaction conditions.Finally, the structures of the small molecule fluorescent compounds wereconfirmed. Properties of these materials were studied including thermal stability,photophysical properties, and quantum chemical calculations. According to the results,relationships of structure sand properties of these materials were discussed.