Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1-pyridyl-3-(4,5-pinenopyridyl)benzene) Aggregate in the Excited State

Saori Tanaka, Kyohei Sato, Kyoko Ichida, Taichi Abe, Taro Tsubomura, Takayoshi Suzuki, Kazuteru Shinozaki

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


We prepared enantiomers of chiral PtII complexes, Pt(pppb)Cl and Pt(pppb)CN (pppbH=1-pyridyl-3-(4,5-pinenopyridyl)benzene), and measured their CPL (circularly polarized luminescence) spectra for excimer and trimer emission. The contribution of the pinene moiety to CPL was considerably low for the π-π∗ emission of the monomer but large for MMLCT (metal-metal-to-ligand charge-transfer) of the excimer and trimer which had a helical structure induced in a face-to-face stacking fashion. The trimer CPL for (+)-Pt(pppb)Cl was larger in intensity than that of excimer CPL; on the other hand, that for (+)-Pt(pppb)CN was opposite in sign compared with that of excimer CPL. We conclude that differences in the excited-state structure of the aggregate between Pt(pppb)Cl and Pt(pppb)CN account for the variation in the CPL spectra. By the aid of TD-DFT calculations it was predicted that the dihedral angle θ(Cl-Pt-Pt-Cl) was 50-60° or 110-140° for Pt(pppb)Cl aggregates and 160° for Pt(pppb)CN aggregates.

Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalChemistry - An Asian Journal
Issue number2
Publication statusPublished - Jan 20 2016


  • circularly polarized luminescence
  • excimer
  • excited-state structure
  • metal-metal interaction
  • platinum complex

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry


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