Citation: 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]. Chinese Journal of Organic Chemistry, ;2018, 38(1): 171-182. doi: 10.6023/cjoc201709010 shu

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

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

Corresponding author: Huo Shouquan, huos@ecu.edu
Received Date: 8 September 2017
Revised Date: 12 October 2017
Available Online: 16 January 2017

Figures(9)

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.
- platinum complexes,
- phosphorescent materials,
- crystal structure,
- photophysics
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