锁定具有键的共价有机框架:对晶体结构,物理性质和光化学活性的一般和显著影响
Xiong Chen1, Matthew Addicoat, Enquan Jin
1Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences , 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan.
Journal of the American Chemical Society
|February 24, 2015
概括
使用键合成平面二维共价有机框架 (2D COF) 提高了材料的性能. 这种设计策略改善了晶体性,多孔性,光吸收和光催化活性.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 纳米技术纳米技术
背景情况:
- 二维共价有机框架 (2D COF) 提供可调节的电子和多孔性质.
- 控制二维COF的形状对于优化其物理特性至关重要.
- 结合 (H-结合) 是一种潜在的超分子工具,用于COF中的结构控制.
研究的目的:
- 通过内层H结合相互作用锁定2DCOF的合成.
- 为了研究H键如何影响基于氨酸的COF的平面性和电子性质.
- 探索平面化对材料整体性能的影响,包括光催化.
主要方法:
- 使用三组合凝结系统合成以 imine 结合的四角形氨酸COFs.
- 调整COF边缘单元上的H结合点的内容.
- 合成的COF的结构性,电子性和光催化性质的表征.
主要成果:
- 内部层的H结合成功地抑制了边缘单元的扭转,导致平面的2D COF板.
- 平面化增强了层间相互作用,并扩大了π云外定位.
- 平面板的AA堆叠放大了这些效应,改善了结晶性,毛孔性,光收获,减少了带间隙,并通过光催化促进了单片氧生成.
- 这些发现对于自由基和金属氨酸COF均是一致的.
结论:
- 超分子H键是实现平面2DCOF的有效策略.
- 平面化显著增强了COF的光电子和光催化性能.
- 这项工作为通过超分子组装设计功能性COF开辟了新的途径.
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