Significant Enhancement of Absorption and Luminescence Dissymmetry Factors in the Far-Red Region: A Zinc(II) Homoleptic Helicate Formed by a Pair of Achiral Dipyrromethene Ligands

Hiroaki Ito, Hayato Sakai, Yoshinori Okayasu, Junpei Yuasa, Tadashi Mori, Taku Hasobe

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

A homoleptic zinc(II) helicate organized by a pair of achiral dipyrromethene ligands through zinc(II) coordination was synthesized to evaluate the chiroptical properties. This zinc complex showed strong exciton-coupled chiroptical responses from the helical configuration with a large absorption dissymmetry factor |gabs| (up to 0.20). More importantly, intense polarized luminescence in the far-red region (700–850 nm) with a fluorescence quantum yield ΦFL of 0.23 was observed for this helicate with a dissymmetry factor |glum| of 0.022, the largest value among rare-earth- and precious-metal-free small molecules. These unprecedentedly large g values were supported by theoretical calculations.

Original languageEnglish
Pages (from-to)16889-16894
Number of pages6
JournalChemistry - A European Journal
Volume24
Issue number63
DOIs
Publication statusPublished - 2018 Nov 13

Keywords

  • circular dichroism
  • circularly polarized luminescence
  • far-red fluorescence
  • zinc helicate

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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