Abstract

采用密度泛函理论(DFT)B3LYP方法对含有噻吩环的吡啶Ru(II)配合物的电子结构和非线性光学(NLO)性质进行理论研究.结果表明:配合物[RuII(NH3)5L]2+(L为含噻吩环的有机基团)中,配位原子与中心金属离子间没有形成稳定的化学键,但存在较强的供体-受体(D-A)相互作用;NH3被羰基(CO)取代后,Ru-C间形成了稳定的σ-π配键,降低了受体的空轨道能级.噻吩环的增加增大了体系的共轭程度,有利于分子内电荷转移,使配合物的极化率α和一阶超极化率β明显增加.结合配合物的前线分子轨道分析发现,电荷转移过程中,对体系二阶NLO系数贡献较大的是配体内电荷转移(ILCT)和配体间电荷转移(LLCT)跃迁,羰基引入后配体到金属的电荷转移(LMCT)使配合物[RuII(CO)5L]2+比对应的配合物[RuII(NH3)5L]2+的β值增大约7倍.

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