Triarylamines with branched multi-pyridine groups: modulation of emission properties by structural variation, solvents,and tris(pentafluorophenyl)borane

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（5）
• 页码范围: 545-556
• 页数: 12页
• 语种: 英文

摘要

Six triarylamine derivatives 1-6 with branched multi-pyridine substituents were prepared and characterized.These compounds are distinguished by the substituent on one of the phenyl group with NO2 for 1,CN for 2,C1 for 3,p-C6H4OMe for 4,OMe for 5,and NMe2 for 6,respectively.As revealed by single crystal X-ray analysis,these substituents play an important role in determining the configuration of the triarylamine framework and the crystal packing of 1-6.The emission properties of these compounds were examined in different solvents (toluene,CH2C12,acetone,tetrahydrofuran (THF),and N,N-dimethylformamide (DMF)) and in solid states.Distinct dual emissions from the localized emissive state and the intramolecular charge transfer state were observed for compound 5 in CH2C12.Compounds 1 and 6 show apparent aggregated enhanced emissions in acetone/H2O.The emission properties of these compounds were further modulated by the addition of tris(pentafluorophenyl)borane.In addition,density functional theory (DFT) and time-dependent DFT (TDDFT) calculations have been performed on the ground and singlet excited states to complement the experimental findings.