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Host–Guest Chemistry Within Cellulose Nanocrystal Gel Receptors
Angewandte Chemie International Edition ( IF 12.257 ) Pub Date : 2020-01-13 , DOI: 10.1002/anie.201913030
Dongjie Zhang; Miguel Soto; Lev Lewis; Wadood Hamad; Mark MacLachlan

Cellulose nanocrystals (CNCs) spontaneously assemble into gels when mixed with a polyionic organic or inorganic salt. Here, we have used this ion‐induced gelation strategy to create functional CNC gels with a rigid tetracationic macrocycle, cyclobis(paraquat‐ p ‐phenylene) (CBPQT 4+ ). Addition of [CBPQT]Cl 4 to CNCs causes gelation and embeds an active host inside the material. The fabricated CNC gels can reversibly absorb guest molecules from solution, followed by molecular recognition processes that render colorful host–guest complexes. These materials have been implemented in gel chromatography (for guest exchange and separation), and as elements to encode 2‐ and 3‐dimensional patterns. We anticipate that this concept might be extended for the design of a set of responsive and selective gel‐like materials functioning as, for instance, water‐pollutant scavengers, substrates for chiral separations, or molecular flasks.
更新日期:2020-01-14

 

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