Energy‐Efficient Iodine Uptake by a Molecular Host⋅Guest Crystal. (26th October 2022)

• Record Type: Journal Article
• Authors: Yang, Xue; Li, Chunyang; Giorgi, Michel; Siri, Didier; Bugaut, Xavier; Chatelet, Bastien; Gigmes, Didier; Yemloul, Mehdi; Hornebecq, Virginie; Kermagoret, Anthony; Brasselet, Sophie; Martinez, Alexandre; Bardelang, David
• Is Part Of: Angewandte Chemie. Volume 134:Number 49(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-26
• Subjects: Cucurbituril -- Iodine Adsorption -- Porous Material -- Supramolecular -- Verkade Superbase; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202214039
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Recently, porous organic crystals (POC) based on macrocycles have shown exceptional sorption and separation properties. Yet, the impact of guest presence inside a macrocycle prior to adsorption has not been studied. Here we show that the inclusion of trimethoxybenzyl‐azaphosphatrane in the macrocycle cucurbit[8]uril (CB[8]) affords molecular porous host⋅guest crystals (PHGC‐1 ) with radically new properties. Unactivated hydrated PHGC‐1 adsorbed iodine spontaneously and selectively at room temperature and atmospheric pressure. The absence of (i) heat for material synthesis, (ii) moisture sensitivity, and (iii) energy‐intensive steps for pore activation are attractive attributes for decreasing the energy costs. 1 H NMR and DOSY were instrumental for monitoring the H2 O/I2 exchange. PHGC‐1 crystals are non‐centrosymmetric and I2 ‐doped crystals showed markedly different second harmonic generation (SHG), which suggests that iodine doping could be used to modulate the non‐linear optical properties of porous organic crystals. Abstract : A hydrated and molecular porous host⋅guest crystal (PHGC‐1 ) made of cucurbit[8]uril and trimethoxybenzylazaphosphatrane can adsorb iodine spontaneously and selectively at room temperature and atmospheric pressure. The absence of a) heat for material synthesis, b) moisture sensitivity, and c) energy‐intensive steps for pore activation are very attractive attributes of this new generation of energy‐saving porous materials.