Ruthenium Complexes Bearing Axially Chiral Bipyridyls: The Mismatched Diastereomer Showed Red Circularly Polarized Phosphorescence

Kazuto Takaishi, Yusuke Nakatsuka, Hitomi Asano, Yuya Yamada, Tadashi Ema

Research output: Contribution to journalArticlepeer-review

Abstract

RutheniumII complexes bearing three axially chiral bipyridyl ligands were synthesized as a new family of chiral complex dyes, and Δ-(S)- and Λ-(S)-diastereomers were obtained. The X-ray crystal structure analyses, spectroscopy, and DFT calculations suggested that all the bipyridyls maintained chirality in both the ground and excited states, and the Δ-(S)- and Λ-(S)-isomers are the matched (more relaxed) and mismatched (more constrained) pairs, respectively. The mismatched Λ-(S)-isomer exhibited red circularly polarized phosphorescence (CPP) both in solution and in the solid state. The solution state CPP is the most intense of ruthenium complexes, while the solid state CPP is the first example of them. It is supposed that, for the Λ-(S)-isomer, the six cumulative CH/π interactions suppress further distortion in the T1 state.

Original languageEnglish
Article numbere202104212
JournalChemistry - A European Journal
Volume28
Issue number6
DOIs
Publication statusPublished - Jan 27 2022

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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