Luminescent calix[4]arene-based metallogel formed at different solvent composition.
Luminescent calix[4]arene-based metallogel formed at different solvent composition.
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DOI：
10.1021/ic500266f
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发表时间：
2014-07
影响因子：
4.6
通讯作者：
Jaehyeon Park;Ji Ha Lee;J. Jaworski;S. Shinkai;J. Jung
中科院分区：
文献类型：
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作者：
Jaehyeon Park;Ji Ha Lee;J. Jaworski;S. Shinkai;J. Jung
我们合成了一种含三联吡啶的杯[4]芳烃衍生物（1），并发现在不同组成的DMSO/H_2O中，Pt（2+）存在下发生凝胶化。推测谷胱甘肽通过Pt-Pt和π-π堆积相互作用介导。扫描电子显微镜图像显示干凝胶为球形结构，直径为1.8-2.1 μm。有趣的是，金属凝胶显示出强烈的发光增强，这取决于溶剂的DMSO/H2O比。我们研究了浓度、温度和时间分辨率对凝胶1-Pt（2+）和溶胶1-Pt（2+）的发光发射的影响。金属凝胶的发光寿命特别长，大约为几微秒。发光寿命还强烈依赖于溶剂组成。我们还确定了热力学参数的自组装凝胶的Birks动力学计划。此外，在大于4.0当量的Pt（2+）存在下，金属凝胶的流变性质与所施加的Pt（2+）浓度无关。
We have synthesized a calix[4]arene derivative (1) containing terpyridine and showed that gelation occurred in the presence of Pt(2+) in DMSO/H2O of varying compositions. Gelation was presumably mediated by the Pt-Pt and π-π stacking interactions. The scanning electron microscopy image of the xerogel showed a spherical structure with diameter of 1.8-2.1 μm. Interestingly, the metallogel showed strong luminescence enhancement, which was dependent on the DMSO/H2O ratio of the solvent. We examined the effects of concentration, temperature, and time resolution on the luminescence emission of both the gel 1-Pt(2+) and the sol 1-Pt(2+). The luminescence lifetimes of the metallogel were particularly long, on the order of several microseconds. The luminescence lifetimes were also strongly dependent on the solvent composition. We also determined the thermodynamic parameters for the self-assembly of the gel by the Birks kinetic scheme. Furthermore, the rheological properties of the metallogels in the presence of more than 4.0 equiv of Pt(2+) were independent of the concentration of Pt(2+) applied.