Functionalized mesoporous polymer ionic liquids for efficient immobilization of lipase: Effects of ethyl oleate

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

“…61 The stretching vibration peak of C]C in benzene rings was detected at 1593 cm −1 . 58 The wavenumber at 1226 cm −1 is ascribed to the Ph-C bond. 62 The peak at approximately 1141 cm −1 is the result of the C-O-C stretching mode of crown ethers.…”

“…It is well established that the chelation of crown ethers with K + signicantly attenuates the interaction with KI and enhances the nucleophilicity of I − , and the synergistic interplay between HBD functional groups and nucleophilic I − effectively promotes the CO 2 -catalyzed conversion to cyclic carbonate, as supported by previous literature reports. 42,43,58 Based on the experimental ndings, a reaction mechanism was put forward for this reaction in Scheme 2. First, the activated epoxide is generated via hydrogen bonding interactions between -OH groups in complex I and O atoms in epoxides, thereby polarizing the C b -O bond to form intermediate II.…”

“…According to the pieces of literature, HBDs can not only interact with O atoms in epoxides by hydrogen bonding, which could accelerate ring opening effectively because of polarized C-O bond, [55][56][57] but also stabilize transition states and intermediates during the reactions. 58 The molecular structure containing oxygen, sulfur, nitrogen and other heteroatoms, halogen atoms, hydroxyl functional groups, benzene rings, etc., can signicantly augment the polymers' iodine adsorption capacity. 59 In this work, three crown ether-based hydroxyl-rich organic polymers (CHOP@KI-1, CHOP@KI-2, and CHOP@KI-3) with multiple HBDs and nucleophilic regents were designed and synthesized.…”