Efficient and tunable phosphorescence of new platinum(II) complexes based on the donor-π-acceptor Schiff bases

Jie Zhang*, Guoliang Dai, Fengshou Wu, Dan Li, Dongchun Gao, Haiwei Jin, Song Chen, Xunjin ZHU, Chenxiu Huang, Deman Han

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 2,3-diaminomaleonitrile and benzene-1,2-diamine, respectively, afforded two donor-π-acceptor Schiff base ligands H2L1 and H2L2. For comparison, the condensation of 3,5-di-tert-butyl-2-hydroxybenzaldehyde with 4-(trifluoromethyl)benzene-1,2-diamine produced the ligand H2L3. Subsequently, their corresponding platinum(II) complexes PtL1, PtL2 and PtL3 were prepared through the metallation of ligands with K2PtCl4. All the ligands and complexes were characterized by 1H NMR, infrared spectroscopy and mass spectrometry. And their thermal stabilities, photophysical properties, and electrochemical behaviors were investigated in detail. These complexes show yellow to red emissions with the highest quantum yield of 8.6% for PtL1. The decay times in microsecond scale (1.97-2.35 μs) indicate their phosphorescence characteristics arising from the triplet state. The B3LYP density functional theory calculations shows that the HOMO-LUMO gaps of PtL1, PtL2 and PtL3 are 2.53, 3.07 and 2.78 eV, respectively, which are well consistent with their photophysical properties. With the advantages of preparative accessibility and high thermal stability, these new phosphorescent platinum(II) complexes are attractive as emissive layer in organic light-emitting diodes.

Original languageEnglish
Pages (from-to)12-18
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume316
DOIs
Publication statusPublished - 1 Feb 2016

Scopus Subject Areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

User-Defined Keywords

  • Donor-π-acceptor
  • Phosphorescence
  • Platinum(II) complexes
  • Schiff bases
  • Tunable emissions

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