A Comparative Study on Phosphorescent Cycloplatinated Complexes Based on Tridentate C^N^N-Coordinating Ligands and Phenylethynyl or Phenyl Ligand

doi:10.6023/cjoc201709010

Chin. J. Org. Chem. ›› 2018, Vol. 38 ›› Issue (1): 171-182.DOI: 10.6023/cjoc201709010 Previous Articles Next Articles

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基于C^N^N三齿配体以及苯乙炔基或苯基的环金属化铂磷光络合物的比较研究

Robert Mroz^a, Dileep A. K. Vezzu^a, Brian Wallace^a, Deepak Ravindranathan^a, Jeffrey Carroll^a, Robert D. Pike^b, 霍守权^a

a Department of Chemistry,East Carolina University, Greenville, North Carolina 27858, USA;
b Department of Chemistry, College of William and Mary, Williamsburg, VA 23185, USA

收稿日期:2017-09-08 修回日期:2017-10-12 发布日期:2017-10-16
通讯作者: 霍守权 E-mail:huos@ecu.edu

A Comparative Study on Phosphorescent Cycloplatinated Complexes Based on Tridentate C^N^N-Coordinating Ligands and Phenylethynyl or Phenyl Ligand

Mroz Robert^a, Vezzu Dileep A. K.^a, Wallace Brian^a, Ravindranathan Deepak^a, Carroll Jeffrey^a, Pike Robert D.^b, Huo Shouquan^a

a Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, USA;
b Department of Chemistry, College of William and Mary, Williamsburg, VA 23185, USA

Received:2017-09-08 Revised:2017-10-12 Published:2017-10-16
Contact: 霍守权 E-mail:huos@ecu.edu

1. A Comparative Study on Phosphorescent Cycloplatinated Complexes Based on Tridentate C^N^N-Coordinating Ligands and Phenylethynyl or Phenyl Ligand.PDF(5032KB)

Abstract

Two series of platinum complexes, 1a～6a and 1b-6b, based on tridentate cyclometalating ligands 2-aryl-6-(1H- pyrazol-1-yl)pyridine [Ar＝phenyl (L1), 2,4-difluorophenyl (L2), 3,5-dimethylphenyl (L3), 3-methoxyphenyl (L4), 2-thienyl (L5), 2-benzothienyl (L6)], and phenylethynyl and phenyl ancillary ligand were synthesized and characterized. The X-ray crystal structures of 2b, 3b and 5b were determined, which revealed a twisted orientation of the phenyl ligand with respect to the coordination plane and a weaker Pt—C(phenyl) bond compared with the Pt—C(alkynyl) bond in 1a. Photophysical properties including electronic absorption and emission spectra were studied. Complexes 1a～6a based on the phenylethynyl ligand were strongly emissive, while 1b～3b based on the phenyl ligand were only weakly emissive. However, 4b～6b displayed lower but decent photoluminescent quantum yields than those of 4a～6a, which is explained by the localization of the excited states in the tridentate cyclometalating ligands. The higher quantum efficiencies displayed by the complexes 1a～6a may be attributed to the stronger and more rigid acetylide ligand.

Key words: platinum complexes, phosphorescent materials, crystal structure, photophysics

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Mroz Robert, Vezzu Dileep A. K., Wallace Brian, Ravindranathan Deepak, Carroll Jeffrey, Pike Robert D., Huo Shouquan. A Comparative Study on Phosphorescent Cycloplatinated Complexes Based on Tridentate C^N^N-Coordinating Ligands and Phenylethynyl or Phenyl Ligand[J]. Chin. J. Org. Chem., 2018, 38(1): 171-182.

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基于C^N^N三齿配体以及苯乙炔基或苯基的环金属化铂磷光络合物的比较研究

A Comparative Study on Phosphorescent Cycloplatinated Complexes Based on Tridentate C^N^N-Coordinating Ligands and Phenylethynyl or Phenyl Ligand

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