运用密度泛函理论对喹吖啶酮的光物理性质进行了研究.结果表明,B3LYP/6-31G(d)//TD-B3LYP-PCM/6-311+G(d)和CIS/6-31G(d)//TD-B3LYP-PCM/6-311+G(d)方法能分别较好地描述喹吖啶酮的光吸收和光发射性质.在吸收和发射的电子跃迁过程中,主要是π-π*跃迁,电荷在N和O之间的转移,既包括单分子内的电荷跃迁,也包括了通过氢键或π-π作用形成的二聚体的电荷跃迁.溶剂对其光物理性质是有影响的,这种影响是通过改变其前线轨道能来实现的,受影响最大的是最高占据分子轨道(HOMO).
The photophysical properties of quinacridone(QA) were studied by using density functional theory(DFT).The absorption and emission properties of QA are described well by B3LYP/6-31G(d)//TD-B3LYP-PCM/6-311+G(d) and CIS/6-31G(d)//TD-B3LYP-PCM/6-311+G(d) methods,respectively.The electron transition is π-π* transition and the charge transfer mainly happens be-tween N and O atoms,both single-molecule charge transfer and dimer charge transfer formed through hy-drogen bonding or π-π interaction are involved in.The effect of solvent on the photophysical properties of quinacridone is achieved by changing its HOMO energy level.