Anisotropically Swelling Gels Attained through Axis-Dependent Crosslinking of MOF Crystals

Takumi Ishiwata; Kenta Kokado; Kazuki Sada

doi:10.1002/anie.201611338

Anisotropically Swelling Gels Attained through Axis-Dependent Crosslinking of MOF Crystals

Angew Chem Int Ed Engl. 2017 Mar 1;56(10):2608-2612. doi: 10.1002/anie.201611338. Epub 2017 Jan 27.

Authors

Takumi Ishiwata¹, Kenta Kokado^{1

2}, Kazuki Sada^{1

2}

Affiliations

¹ Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita10 Nishi8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
² Faculty of Science, Hokkaido University, Japan.

PMID: 28128499
DOI: 10.1002/anie.201611338

Abstract

Anisotropically deforming objects have attracted considerable interest for use in molecular machines and artificial muscles. Herein, we focus on a new approach based on the crystal crosslinking of organic ligands in a pillared-layer metal-organic framework (PLMOF). The approach involves the transformation from crosslinked PLMOF to polymer gels through hydrolysis of the coordination bonds between the organic ligands and metal ions, giving a network polymer that exhibits anisotropic swelling. The anisotropic monomer arrangement in the PLMOF underwent axis-dependent crosslinking to yield anisotropically swelling gels. Therefore, the crystal crosslinking of MOFs should be a useful method for creating actuators with designable deformation properties.

Keywords: click chemistry; crystal engineering; gels; metal-organic frameworks; polymerization.

Publication types

Research Support, Non-U.S. Gov't