Organogels of 8-quinolinol/metal(II)-chelate derivatives that show electron- and light-emitting properties

Michihiro Shirakawa, Norifumi Fujita, Takahiro Tani, Kenji Kaneko, Masayoshi Ojima, Akihiko Fujii, Masanori Ozaki, Seiji Shinkai

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73 Citations (Scopus)

Abstract

8-Quinolinol/copper(II)-, palladium(II)-, and platinum(II)-chelate-based organogelators (IM) and their nongelling reference compounds (2M) were synthesized. Complexes IM could gelate various organic solvents at very low concentrations. Electron microscope measurements gave visual images of well-developed fibrous structures characteristic of low-molecular-weight organogels. UV/Vis and FTIR spectroscopy revealed that the good gelation ability of IM arises from the π-π interactions of the chelate moieties and the hydrogen-bond interactions among the amide groups. Very interestingly, field emission performances of the nanofibers prepared from the IM gels are evidently different depending on the electronic states of the three kinds of central metals. In addition, the 1Pt gel shows unique thermo- and solvatochromism of visible and phosphorescent color in response to a sol-gel phase transition. Furthermore, the 1Pt gel possesses an attractive ability to inhibit dioxygen quenching of excited triplet states, which increases the phosphorescence quantum yield of this gel. This effect is attributed to the isolation effect of the phosphorescent chelate moiety from the dioxygen-containing solution phase.

Original languageEnglish
Pages (from-to)4155-4162
Number of pages8
JournalChemistry - A European Journal
Volume13
Issue number15
DOIs
Publication statusPublished - Jun 21 2007

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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