Reskarch On Thk Synthesis Of Novel Fluorene Derivatives

Fluorene and its derivatives are very useful electroluminescent materials becauseof its excellent electrical properties and optical properties. In the past few years, thesecompounds are widely used in the light emitting diode, laser devices, photovoltaiccells and biosensor devices because of its excellent electrical properties and opticalproperties.In order to improve the fluorene’s electroluminescent properties, currently themain use of the preparation of small molecules fluorene light emitting materials.Thestructure of the small molecule fluorene electroluminescent materials is explicit, theorthogonal relationship between the performance and structure of the material isrelatively straightforward and the experiment is also relatively easy to control. Inaddition，such materials have irreplaceable advantages with polymer materials in thesolubility and processability. Therefore, in order to improve the luminescentproperties of fluorene material, the synthesis of various structures fluorene smallmolecular luminescent materials has become the research focus of scientists at homeand abroad.We use the fluorene、chalcones and aromatic aldehydes as raw materials,synthesize a series of9-substituted fluorene small molecule compounds that have notbeen reported by Michael addition reaction and Knoevenagel reaction.Three aspects were included in this paper:（1）The fluorene and chalcones as raw materials, a series of9-(3-Oxo-1,3-bisarylpropyl) fluorene derivatives were synthesized by Michael addition reaction.The structures of all the title compounds were characterised by IR、MS、1H NMR andelementary analysis. The single crystal of target of compoundⅠa was cultured and thecrystal structure was determined by X-ray diffraction analysis.（2）The aromatic aldehydes and2-nitro-fluorene as raw materials，a series of2-nitro-10-(arylpropylmethylidyne) fluorene derivatives were synthesized byKnoevenagel reaction. The structures of all the title compounds were characterised by IR、MS、1H NMR and elementary analysis. At the same time the fluorescence propertyof the part of the material Ⅱ series were determined very good.（3）A novel compound of9-(3,4-dichlorophenymethylidyne) fluorene wassynthesized via Knoevenagel reaction under microwave irradiation. The single crystalof target of compound Ⅲa was cultured. The crystal structure was determined byX-ray diffraction analysis.