Volume 59, Issue 12 pp. 4705-4710
Research Article

Host–Guest Chemistry Within Cellulose Nanocrystal Gel Receptors

Dongjie Zhang

Dongjie Zhang

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1 Canada

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001 P. R. China

These authors contributed equally to this work.

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Miguel A. Soto

Miguel A. Soto

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1 Canada

These authors contributed equally to this work.

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Lev Lewis

Lev Lewis

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1 Canada

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Wadood Y. Hamad

Wadood Y. Hamad

Transformation and Interfaces Group, Bioproducts Innovation Centre of Excellence, FPInnovations, 2665 East Mall, Vancouver, British Columbia, V6T 1Z4 Canada

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Mark J. MacLachlan

Corresponding Author

Mark J. MacLachlan

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1 Canada

Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, British Columbia, V6T 1Z4 Canada

WPI Nano Life Science Institute, Kanazawa University, Kanazawa, 920-1192 Japan

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First published: 13 January 2020
Citations: 19

Graphical Abstract

Mixing cellulose nanocrystal suspensions (CNC-Na+) with the polyionic macrocycle cyclobis(paraquat-p-phenylene) (CBPQT4+) yields gels with embedded active hosts. These materials reversibly absorb and recognize guests from solution to produce colorful host–guest complexes. This behavior has enabled CNC-CBPQT4+ gels to function as substrates for chromatography and encryption.

Abstract

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) (CBPQT4+). Addition of [CBPQT]Cl4 to CNCs causes gelation and embeds an active host inside the material. The fabricated CNC gels can reversibly absorb guest molecules from solution then undergo molecular recognition processes that create 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 to design a set of responsive and selective gel-like materials functioning as, for instance, water-pollutant scavengers, substrates for chiral separations, or molecular flasks.

Conflict of interest

The authors declare no conflict of interest.

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