2022年4月6日 · Here we present a reconstruction strategy for COF synthesis that uses a reversible and removable covalent tether to pre-organize monomers before an irreversible polymerization. This route yields...

2 天之前 · Developing effective photocatalysts for the oxidation reaction is of great significance in chemical synthesis but is still challenging. Herein, linking photochromic triphenylamine with pyrene units by the in situ formed robust imidazole moieties, a covalent organic framework (COF), PyNTB-COF, containing a rare donor–acceptor-π-acceptor–donor (D …

2025年3月24日 · The Fourier-transform infrared (FT-IR) spectrum of Joa-COF-1 is consistent with the successful polymerization process of the starting materials as it shows the distinctive C─O stretching bands at 1352 and 1317 cm −1 for boronate ester five-membered rings and the attenuation of O─H band of the catechol and the boronic acid groups (Figure S1).

1 天前 · Firstly, the FT-IR spectroscopy of the CuTB-COF and CuTB-COF were shown in Fig. 2 b. In contrast to the monomer ( Fig. S1, S7 and S12 ), the disappearance of the C-H stretching peak of aldehyde group at 2720–2830 cm −1 and the N-H stretching peak of amino group at 3300–3400 cm −1 suggests that the groups were involved in the responses.

2024年2月29日 · Covalent organic frameworks (COFs) are ideal templates for constructing metal-free catalysts for the oxygen reduction reaction due to their highly tuneable skeletons and...

3 天之前 · The successful growth of the TpPa-S COF layer was confirmed by Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) analysis, as evidenced by the appearance of characteristic peaks at 1278 and 1573 cm −1, corresponding to the C─N and C = C bonds formed during the Schiff base reaction (Figure 2b).

新型cof/cof异质结构，通过π-π相互作用强化电子相互作用，显著提升光生电荷分离效率，实现高效整体水分解，氢气和氧气演化速率创纪录，是光催化剂领域的重大突破。chemsoon-专业合成定制cof-316材料

2025年1月14日 · 【 要点1 】 通过后氧化法成功合成了具有稳定中性碳自由基中心的共价有机框架（cof）材料（cof-r）。这种材料在保持结晶性的同时，实现了碳自由基的稳定存在；

2025年3月27日 · Meanwhile, we demonstrate that the iodine atom-induced weak electron polarization of the acceptor unit endows the I-COF photocatalyst with the adaptable electron potential energy level for maximum 2e ... (FTIR) spectrum, and Raman spectrum. XPS patterns of R-COFs (R = F, Cl, Br, and I) confirm the presence of a halogen atom (Figure S7).

2025年2月1日 · FT-IR观察到COF中醛基和氨基特征伸缩振动峰的消失，以及在1630 cm-1 处亚胺特征振动峰的出现，表明亚胺键的生成（图2a）。 通过仔细对比[s-4+3]体系各种可能的拓扑结构，发现3DCOF-CN的实验PXRD与 fmj 拓扑的模拟值吻合良好（图2b），表明目标拓扑的成功合成。