POPs to COFs by post-modification: CO2 chemisorption and dissolution

• Published in: Organic & biomolecular chemistry 2024-03, Vol.22 (12), p.2456-2464
• Main Authors: Aladwan, Ayham A, Qaroush, Abdussalam K, Eftaiha, Ala'a F, Hammad, Suhad B, Al-Qaisi, Feda M, Assaf, Khaleel I, Repo, Timo
• Format: Article
• Language: English
• Subjects: Aldehydes; Carbon 13; Carbon dioxide; Chemisorption; Colorimetry; Diamines; Functional groups; Monoethanolamine (MEA); NMR; Nuclear magnetic resonance; Polymers; Spectroscopy; X ray powder diffraction; X-ray diffraction
• ISSN: 1477-0520; 1477-0539
• DOI: 10.1039/d3ob02054a

Porous organic polymers (POPs) and covalent organic frameworks (COFs) are hierarchical nano materials with variable applications. To our knowledge, this is the first report of a post-modified, non-renewable, DMSO-soluble M-POP/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) upon atmospheric H2O/CO2 trapping after 48 h, forming a DBUH+·HCO3− adduct, as verified by solution carbon-13 nuclear magnetic resonance (13C NMR) spectroscopy. The success of the post-modification resulting from aldehyde enriched POPs was proven spectroscopically. The accessible functional group was reacted with excess monoethanolamine (MEA) resulting in the formation of M-POP. Away from CO2 physisorption, only few examples have been reported on the chemisorption process. One such example is the ethylene diamine-functionalized E-COF, capable of capturing CO2via carbamation. This was evidenced by several qualitative measurements including colorimetry and conductivity, which showed an unprecedented water solubility for a 2D COF material. The crystallinity of COFs as a result of post-modification was proven by powder X-ray diffraction (PXRD).