Multicolor emission and photophysical properties of proton-responsive cyclometallated iridium(III) complex in transparent cation-exchange membrane

Hajime Kamebuchi, Yu Fujimura, Taiho Yoshioka, Atsushi Okazawa, Makoto Tadokoro, Norimichi Kojima*

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

A transparent film allowing tunable multicolor emission based on a composite of an organometallic compound and a cation-exchange membrane has been developed, in which the cyclometallated iridium(III) complex [IrIII (4Py-ppy)3] (=tris[2-(2-pyridinyl-κN)-4-(4-pyridinyl)phenyl-κC]iridium) (1) with pH-dependent emission wavelengths has been incorporated into Nafion by cation exchange. Soaking Nafion in the solution of 1 for 24 h and exposed to buffers at pH 2, 4, and 10 resulted in maximum emission wavelengths of 587, 560, and 503 nm, respectively. The photophysical properties of 1@Nafion were also enhanced, as its maximum emission wavelength was more blue-shifted than those of 602, 564, and 503 nm in the solutions. The emission quantum yields (Φ) and lifetimes (τ) of 1@Nafion prepared under an acidic condition were up to Φ = 1.8% and τ = 0.11, 0.92 µs, which are considerably higher than the corresponding solutions of Φ = 0.5% and τ = 0.02, 0.18 µs. This is attributed to the fact that 1 is surrounded by the polymer chains of Nafion and immobilized in a relatively rigid medium, which hinders non-radiative deactivation such as thermal relaxation.

本文言語English
論文番号653
ページ(範囲)1-9
ページ数9
ジャーナルCrystals
10
8
DOI
出版ステータスPublished - 2020 8月
外部発表はい

ASJC Scopus subject areas

  • 化学工学一般
  • 材料科学一般
  • 凝縮系物理学
  • 無機化学

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