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高等学校化学研究 ›› 2013, Vol. 29 ›› Issue (2): 361-365.doi: 10.1007/s40242-013-2138-3

• Articles • 上一篇    下一篇

TD-DFT Studies on Electronic and Spectral Properties of Platinum(II) Complexes with Phenol and Pyridine Groups

ZHAO Shan-shan, SHI Li-li, SU Zhong-min, GENG Yun, ZHAO Liang   

  1. Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
  • 收稿日期:2012-04-06 修回日期:2012-08-13 出版日期:2013-04-01 发布日期:2013-03-20
  • 通讯作者: SU Zhong-min E-mail:zmsu@nenu.edu.cn
  • 基金资助:

    Supported by the National Basic Research Program of China(No.2009CB623605) and the National Natural Science Foundation of China(Nos.20903020, 21131001).

TD-DFT Studies on Electronic and Spectral Properties of Platinum(II) Complexes with Phenol and Pyridine Groups

ZHAO Shan-shan, SHI Li-li, SU Zhong-min, GENG Yun, ZHAO Liang   

  1. Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
  • Received:2012-04-06 Revised:2012-08-13 Online:2013-04-01 Published:2013-03-20
  • Supported by:

    Supported by the National Basic Research Program of China(No.2009CB623605) and the National Natural Science Foundation of China(Nos.20903020, 21131001).

摘要:

The molecular structures of the ground and the lowest triplet states for a series of Pt(II) complexes PtLCl(1)[L=6-(2-hydroxyphenyl)-2,2′-bipyridine], Pt(pp)2[pp=2-(2-hydroxyphenyl)pyridine](2), PtbpyCl2(bpy=2,2′- bipyridine)(3), and the free tridentate L ligand(4) were optimized by the density functional theory B3LYP and UB3LYP methods, respectively. On the basis of optimized geometries, the spectral properties were investigated with time-dependent density functional theory(TD-DFT). In comparison with those of complexes 2 and 3, the more rigid structure of complex 1 together with its low rate of the radiationless decay via nonemissive d-d state leads to higher photoluminescence quantum efficiency. And the phosphorescence quantum efficiency of complex 1 can be easily controlled by modifying auxiliary ligands. The introduction of fluorine ligand into complexes can effectively increase the radiation transition rate and decrease the radiationless d-d transition rate, and as a result, a novel complex PtLF(5) might be a good phosphorescent material suitable for organic electronic devices.

关键词: Pt(II) complex, Time-dependent density functional theory(TD-DFT), Optoelectronic property

Abstract:

The molecular structures of the ground and the lowest triplet states for a series of Pt(II) complexes PtLCl(1)[L=6-(2-hydroxyphenyl)-2,2′-bipyridine], Pt(pp)2[pp=2-(2-hydroxyphenyl)pyridine](2), PtbpyCl2(bpy=2,2′- bipyridine)(3), and the free tridentate L ligand(4) were optimized by the density functional theory B3LYP and UB3LYP methods, respectively. On the basis of optimized geometries, the spectral properties were investigated with time-dependent density functional theory(TD-DFT). In comparison with those of complexes 2 and 3, the more rigid structure of complex 1 together with its low rate of the radiationless decay via nonemissive d-d state leads to higher photoluminescence quantum efficiency. And the phosphorescence quantum efficiency of complex 1 can be easily controlled by modifying auxiliary ligands. The introduction of fluorine ligand into complexes can effectively increase the radiation transition rate and decrease the radiationless d-d transition rate, and as a result, a novel complex PtLF(5) might be a good phosphorescent material suitable for organic electronic devices.

Key words: Pt(II) complex, Time-dependent density functional theory(TD-DFT), Optoelectronic property