含有共轭炔基的发光Pt(Ⅱ)配合物发光性质的密度泛函理论研究 |
DFT Studies on the Luminescent Pt(Ⅱ) Complexes Containing Conjugated Acetylide Ligand |
|
摘要: 本文利用密度泛函(DFT)和含时密度泛函(TDDFT)方法研究了一系列配合物Pt(ppy)(C≡C)nPh(ppy=6-phenyl-2,2′-bipyridine n=1~6)的基态和激发态的电子结构和发射光谱。计算揭示,当(C≡C)n链长n=1~3时,配合物1~3的磷光发射被指认为是 3[π*(ppy) → Pt(5d),π((C≡C)nPh)](3LMCT/3LLCT)的混合电荷跃迁。而当n=4~6时,配合物4~6的磷光发射主要是来自于(C≡C)nPh配体内部3ππ*跃迁(3ILCT)和少部分的3LLCT微扰跃迁。通过分析前线轨道成份,可以预测当炔基链长n趋于∞时,电荷跃迁将完全发生在炔基链的π轨道之间。 |
关键词: 环金属Pt(Ⅱ)配合物 激发态 发光 密度泛函 含时密度泛函 |
基金项目: |
Abstract: The properties of electronic structures in the ground and excited states and emission spectra of Pt(ppy)(C≡C)n Ph (ppy=6-phenyl-2,2′-bipyridine, n=1~6) were explored by using the DFT and TDDFT method, respectively. The calculations revealed that the lowest energy emissions of 1~3 were assigned as arising from the combinational transitions of 3[π*(ppy) → Pt(5d), π((C≡C)nPh)] charge transfer (3LMCT/3LLCT), whereas those of 4~6 mainly originated from 3π → π* (3ILCT) transition localized upon the (C≡C)nPh moiety and perturbed by some 3LLCT. It was predicted that, with increasing the chain length, the electrons transition would completely come from the ππ* transition in Cn2- chain. |
Keywords: cyclometalated platinum(Ⅱ) complexes excited state luminescence DFT TDDFT |
|
摘要点击次数: 2329 |
全文下载次数: 1902 |
舒 鑫,周 欣,潘清江,李明霞,张红星,孙家钟.含有共轭炔基的发光Pt(Ⅱ)配合物发光性质的密度泛函理论研究[J].无机化学学报,2008,24(6):971-976. |
查看全文 查看/发表评论 下载PDF阅读器 |
Support information: |
|
|
|