Synthesis and characterization of green-to-yellow emissive Ir(III) complexes of pyridylbenzothiadiazine ligand

Amlan Kumar Pal, David Bradford Cordes, Konstantina Pringouri, Muhammad Anwar, Alexandra Martha Zoya Slawin, Jeremy Rawson, Eli Zysman-Colman

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Reaction of Tetrakis(2-phenylpyridinato-C2,N')(μ-dichloro)di-iridium with 3-(pyridin-2-yl)-4H-benzo[e][1,2,4]thiadiazine (L1) under neutral and basic media afforded the charged and neutral Ir-complexes, 1 and 2, respectively, in good yields (63 – 79%). Single crystal XRD analysis confirms that the ancillary ligands in both 1 and 2 binds to the iridium via coordination of N2 of the benzo[e][1,2,4]thiadiazine. Upon isolation of the neutral complex, the sulfur atom rapidly oxidizes to form 2. The UV-vis absorption spectra of the complexes exhibit both ligand-centered and mixed metal-to-ligand and ligand-to-ligand charged transfer (CT) transitions that are typical of many heteroleptic iridium complexes. Complexes 1 and 2 were found to be emissive at room temperature in the green and yellow region of the electromagnetic spectrum, respectively, albeit with poor photoluminescence quantum yield (ΦPL = 1.1 – 2.5%).
Original languageEnglish
Pages (from-to)1924-1937
Number of pages14
JournalJournal of Coordination Chemistry
Volume69
Issue number11-13
Early online date18 Apr 2016
DOIs
Publication statusPublished - 2016

Keywords

  • Ir-complex
  • Benzothiadiazine ligand
  • DFT studies
  • XRD analysis
  • Photophysics
  • Electrochemistry

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