含硫甲基的芴-苯结构化合物的合成、结构和性能

Synthesis,Characterization and Properties of Fluorenyl Phenyl, Based Conjugated Organic Materials

通过双Suzuki偶联反应一步合成了2种含硫甲基的芴-苯结构化合物2,7-二(4-硫甲基苯基)-9,9-二己基-芴(a)和2,7-二(2,6-二甲基-4-硫甲基苯基)-9,9-二己基-芴(b).紫外-可见和荧光光谱以及分子轨道理论计算表明,位阻较小的化合物a具有更好的共轭性能,其最大紫外-可见吸收波长达到351nm,比两端苯基含4个邻位取代基的化合物b红移了38nm;化合物a的最大荧光发射波长达到410nm,为典型的蓝光化合物,比化合物b红移了43nm.化合物a和b都具有较高的荧光量子产率,分别为59%和65%,在光电材料方面具有潜在的应用前景.

Fluorene and its derivatives are important conjugated organic materials for electronic devices. Their oligomers and polymers are the promising blue light-emitting materials with extremely high photoluminescence, quantum yields,and thermal and oxidative stability. The substitutes and stereo of the conjugated compounds play an important role on their electronic properties. In this paper,two kinds of fluorenyl-phenyl oligormers with thiomethyl group such as 2,7-bis-（ 4-methylsulfanyl-phenyl） -9,9-dihexylfluorene （ a） and 2,7-bis（ 2,6-dimethyl-4-methylsulfanyl-phenyl） -9,9-dihexyl-fluorene（ b） were synthesized via the double SuzukiMiyaura cross-coupling in the presence of palladium catalysts. The theory and property investigation show that compound a is more conjugated than compound b. The maximum absorption and fluorescence emission wavelength of compound a are at 351 and 410 nm,respectively. In the contrast,the corresponding absorption and emission of compound b are blue-shift of 38 and 43 nm,respectively. In addition,the synthesized fluorenylphenyl oligormers a and b have high fluorescence quantum yields of 59% and 65% ,respectively. The superior properties of the fluorenyl-phenyl oligormers make these compounds be candidates of organic lightemitting materials.