Volume 62, Issue 29 e202303778
Research Article

A Significant Two-Dimensional Structural Transformation in a Coordination Polymer that Changes Its Electronic and Protonic Behavior

Yao Jing

Yao Jing

Division of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan

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Prof. Yukihiro Yoshida

Corresponding Author

Prof. Yukihiro Yoshida

Division of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan

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Prof. Tokutaro Komatsu

Prof. Tokutaro Komatsu

School of Medicine, Nihon University, 30-1 Oyaguchi-Kamicho, Itabashi-ku, Tokyo, 173-8610 Japan

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Prof. Hiroshi Kitagawa

Corresponding Author

Prof. Hiroshi Kitagawa

Division of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan

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First published: 12 May 2023
Citations: 7

Graphical Abstract

A 2D-to-2D structural transformation with a significant change in the coordination environment within the 2D layer was achieved in a copper-based coordination polymer in water at room temperature. The transformation led to large changes in the physical properties of the coordination polymers, such as proton conductivity and magnetism.

Abstract

A 2D-to-2D (2D: two-dimensional) structural transformation accompanying significant bond rearrangement and coordination environment change is demonstrated in a coordination polymer (CP) comprised of copper(II) ions and terephthalate (BDC2−) ligands for the first time. When immersed in water, a free-standing membrane of 2D Cu(BDC)(DMF) (Cu-1; DMF: N,N-dimethylformamide) transforms into 2D Cu(BDC)(H2O)2 (Cu-2) while maintaining its highly oriented layered structure. In the 2D sheet, paddlewheel-type CuII dimers coordinated with four bidentate BDC ligands in a square-planar array in Cu-1 were released to form uniform aqua-bridged CuII chains, which are cross-linked with each other by unidentate BDC ligands, in Cu-2. The present facile approach to implement the 2D-to-2D transformation accompanied by bond rearrangement, which is characteristic of CPs, leads to a marked increase in in-plane magnetic susceptibility and proton conductivity. In situ experiments in support of theoretical calculations unveiled the energy diagram that governs the unique structural transformation.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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