Nanoarchitectonics of polymeric crown-ether analog of Tröger base combined with potassium iodide and acids synergy in fixation of CO2 and epoxides

Optimization and kinetics of crown ether-based hydroxyl-rich organic polymers for sustainable CO2 fixation and iodine vapor adsorption

“…62 The peak at approximately 1141 cm −1 is the result of the C–O–C stretching mode of crown ethers. 43,63 In the case of CHOP@KIs, the O–H stretching vibration originating from phenol is located at 3465 cm −1 ; 41,61 the absence of the corresponding signal in dialdehydedibenzo-18-crown-6 and the aforementioned peaks suggest the successful formation of a polymer framework via a phenolic formaldehyde condensation reaction.…”

“…42,43 The chemical shi at 132 ppm is responsible for C5 on the benzene ring, the peak at 129 ppm is immediately adjacent to this signal and the peak at 112 ppm, which is a little further away, is a result of C7 and C4, also on the benzene ring. 42,63 Two peaks at 106 and 98 ppm may be ascribed to reacted and unreacted hydroquinone ortho-carbon. 60,61 A strong signal at 68 ppm belongs to the C1 on crown ethers, 43 proving that the polymer backbone maintains the structure of the crown ether.…”