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 journalArticle

3 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
JournalChemistry - A European Journal
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Luminescence
Zinc
Ligands
Rare Earth Metals
Quantum yield
Precious metals
Excitons
Rare earths
Fluorescence
Molecules
dipyrromethene
LDS 751

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

Cite this

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title = "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",
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.",
keywords = "circular dichroism, circularly polarized luminescence, far-red fluorescence, zinc helicate",
author = "Hiroaki Ito and Hayato Sakai and Yoshinori Okayasu and Junpei Yuasa and Tadashi Mori and Taku Hasobe",
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month = "1",
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TY - JOUR

T1 - Significant Enhancement of Absorption and Luminescence Dissymmetry Factors in the Far-Red Region

T2 - A Zinc(II) Homoleptic Helicate Formed by a Pair of Achiral Dipyrromethene Ligands

AU - Ito, Hiroaki

AU - Sakai, Hayato

AU - Okayasu, Yoshinori

AU - Yuasa, Junpei

AU - Mori, Tadashi

AU - Hasobe, Taku

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

KW - circular dichroism

KW - circularly polarized luminescence

KW - far-red fluorescence

KW - zinc helicate

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