Flexible single-layer ionic organic–inorganic frameworks towards precise nano-size separation

Liang Yue, Shan Wang, Ding Zhou, Hao Zhang (), Bao Li and Lixin Wu ()
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Liang Yue: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University
Shan Wang: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University
Ding Zhou: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University
Hao Zhang: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University
Bao Li: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University
Lixin Wu: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University

Nature Communications, 2016, vol. 7, issue 1, 1-10

Abstract: Abstract Consecutive two-dimensional frameworks comprised of molecular or cluster building blocks in large area represent ideal candidates for membranes sieving molecules and nano-objects, but challenges still remain in methodology and practical preparation. Here we exploit a new strategy to build soft single-layer ionic organic–inorganic frameworks via electrostatic interaction without preferential binding direction in water. Upon consideration of steric effect and additional interaction, polyanionic clusters as connection nodes and cationic pseudorotaxanes acting as bridging monomers connect with each other to form a single-layer ionic self-assembled framework with 1.4 nm layer thickness. Such soft supramolecular polymer frameworks possess uniform and adjustable ortho-tetragonal nanoporous structure in pore size of 3.4–4.1 nm and exhibit greatly convenient solution processability. The stable membranes maintaining uniform porous structure demonstrate precisely size-selective separation of semiconductor quantum dots within 0.1 nm of accuracy and may hold promise for practical applications in selective transport, molecular separation and dialysis systems.

Date: 2016
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DOI: 10.1038/ncomms10742

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