Organogels of 8-quinolinol/metal(II)-chelate derivatives that show electron- and light-emitting properties.
Organogels of 8-quinolinol/metal(II)-chelate derivatives that show electron- and light-emitting properties.
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DOI：
10.1002/chem.200601813
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
Michihiro Shirakawa;Norifumi Fujita;T. Tani;K. Kaneko;M. Ojima;A. Fujii;M. Ozaki;S. Shinkai
中科院分区：
文献类型：
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作者：
Michihiro Shirakawa;Norifumi Fujita;T. Tani;K. Kaneko;M. Ojima;A. Fujii;M. Ozaki;S. Shinkai
合成了8-羟基喹啉/铜（II）-、钯（II）-和铂（II）-螯合物基有机胶凝剂（1 M）及其非胶凝参比化合物（2 M）。配合物1 M在很低的浓度下就能与各种有机溶剂形成凝胶。电子显微镜测量给出了低分子量有机凝胶的发达纤维结构特征的视觉图像。UV/维斯和FTIR光谱表明，1 M的良好的凝胶化能力来自于螯合部分的π-π相互作用和酰胺基团之间的氢键相互作用。非常有趣的是，由1 M凝胶制备的纳米纤维的场发射性能明显不同，这取决于三种中心金属的电子状态。此外，1铂凝胶显示出独特的可见光和磷光颜色的热致变色和溶剂化变色响应于溶胶-凝胶相变。此外，1铂凝胶具有一个有吸引力的能力，抑制分子氧猝灭的激发三重态，这增加了这种凝胶的磷光量子产率。这种效应归因于磷光螯合物部分与含双氧溶液相的隔离效应。
8-quinolinol/copper(II)-, palladium(II)-, and platinum(II)-chelate-based organogelators (1 M) and their nongelling reference compounds (2 M) were synthesized. Complexes 1 M 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 1 M arises from the pi-pi 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 1 M gels are evidently different depending on the electronic states of the three kinds of central metals. In addition, the 1 Pt gel shows unique thermo- and solvatochromism of visible and phosphorescent color in response to a sol-gel phase transition. Furthermore, the 1 Pt 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.