Chiral Supramolecular Gels with Lanthanide Ions: Correlation between Luminescence and Helical Pitch
Chiral Supramolecular Gels with Lanthanide Ions: Correlation between Luminescence and Helical Pitch
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DOI：
10.1021/acsami.6b13916
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发表时间：
2017-02-01
影响因子：
9.5
通讯作者：
Jung, Jong Hwa
中科院分区：
文献类型：
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作者：
Kim, Chaelin;Kim, Ka Young;Jung, Jong Hwa
我们报道了含Tb(III)和Eu(III)的超分子水凝胶的荧光强度与螺旋间距之间的关系，以及它们的喷墨打印图案作为应用。可以在没有Eu(III)和Tb(III)的情况下和在有Eu(III)和Tb(III)的情况下制备具有红色、绿色和蓝色三种不同发射的发光凝胶。由Tb(III)和Eu(III)组成的超分子凝胶(Gel-Tb和Gel-Eu)的发光强度比溶胶(1+Tb(III)或1+Eu(III))大约3倍，这归因于分子间的大倾角。通过AFM观察，这些凝胶显示出明确的右旋螺旋纳米纤维由配位键形成，其中螺旋间距长度强烈依赖于稀土离子的浓度。特别是，由于相对较弱的pi-pi堆积和较大的分子间倾角，Gel-Tb的大发光强度表现出比Gel-1更小的螺旋间距长度。随着稀土离子浓度的增加，发光强度呈线性增强。这是超分子材料螺旋间距长度与发光强度之间关系的第一个例子。超分子水凝胶中的配位键对其流变性有很大影响。我们还开发了一种水性喷墨打印系统，可以在A4尺寸的纸张上产生发光超分子凝胶。标志和文本的图像由三种不同的发射物组成，并在涂有Gel-1的A4大小的纸上打印得很好。
We report the correlation between the fluorescence intensity and the helical pitch of supramolecular hydrogels with Tb(III) and Eu(III) as well as their inkjet printing patterning as an application. The luminescent gels, which exhibited three different emissions of red, green, and blue, could be prepared without and with Eu(III) and Tb(III). The luminescence intensity of supramolecular gels (gel-Tb and gel-Eu) composed of Tb(III) and Eu(III) was ca. 3-fold larger than that of the sol (1+Tb(III) or 1+Eu(III)), which was attributed to large tilting angles between molecules. By AFM observations, these gels showed well-defined right-handed helical nanofibers formed by coordination bonds in which the helical pitch lengths were strongly dependent on the concentrations of lanthanide ions. In particular, the large luminescence intensity of gel-Tb exhibited a smaller helical pitch length than that of gel-1 due to relatively weak pi-pi stacking with large tilting angles between molecules. The luminescence intensities were enhanced linearly with increasing concentrations of lanthanide ions. This is the first example of the correlation between the helical pitch length and the luminescence intensity of supramolecular materials. The coordination bonding in supramolecular hydrogels had a strong influence on rheological properties. We also developed a water-compatible inkjet printing system to generate luminescent supramolecular gels on A4-sized paper. The images of a logo and the text were composed of three different emissions and were well-printed on A4-sized paper coated with gel-1.