基于相同的结构基序制造具有不同形态的共价有机框架既有趣又具有挑战性。这里,通过溶剂热法和室温法合成了TTA-TFP-COF,以2,4,6-三(4-氨基苯基)-1,3,5-三嗪(TTA)和1,3,5-三(4-甲酰基苯基)-苯(TFP)为原料。采用不同的合成条件,在合成过程中加入苯胺和苯甲醛作为调节剂,我们发现这些过程会减慢反应速度,增加动态可逆反应的交换和易位反应,提高了反应体系的可逆性。因此,不同形貌TTA-TFP-COF的可控合成,包括微粒,直径可控的空心管,实现了微花。我们进一步的研究发现,金属离子,Fe3+和Cr3+离子,可以与TTA-TFP-COF中的N和O配位,并部分破坏TTA-TFP-COF的结构。TTA-TFP-COF的粒径变小,从而导致COF的光散射强度降低。Fe3的光散射变化(ΔI)和金属离子浓度(c)之间存在极好的线性关系,从2.0到350.0μM,而Cr3的40.0-800.0μM,分别。因此,本文通过TTA-TFP-COF开发了检测金属离子的快速和选择性分析方法。
Fabricating covalent organic frameworks with different morphologies based on the same structural motifs is both interesting and challenging. Here, a TTA-TFP-COF was synthesized by both solvothermal and room temperature methods, with 2,4,6-Tris(4-aminophenyl)-1,3,5-triazine (TTA) and 1,3,5-tris(4-formylphenyl)-benzene (TFP) as raw material. Using different synthesis conditions and adding aniline and benzaldehyde as regulators in the synthesis process, we found that these processes could slow down the reaction speed, increase the exchange and metathesis reactions of dynamic reversible reactions, and improve the reversibility of the reaction system. Thus, controllable synthesis of TTA-TFP-COF with different morphologies, including micro-particles, hollow tubes with controllable diameters, and micro-flowers was achieved. Our further study found that metal ions, Fe3+ and Cr3+ ions, could coordinate with N and O in TTA-TFP-COF and partially destroy the structure of TTA-TFP-COF. The particle size of the TTA-TFP-COF became smaller, thus resulting in the decrease of the light scattering intensity of the COF. An excellent linear relationship exists between the light scattering changes (ΔI) and metal ions concentration (c) from 2.0 to 350.0 μM for Fe3+ and 40.0-800.0 μM for Cr3+, respectively. Thus, rapid and selective analytical methods for detecting metal ions were developed by TTA-TFP-COF here.