DataVXChemistry of MaterialsPaper
journal article·2026-04-14Open access

Oligo(ethylene Oxide)–Polyoxometalate Macrocycles

Hiroto Kaitori, Jun Manabe, Fuga Onishi, Naoyuki Hisano, Takeharu Haino, Ryo Tsunashima, Takayoshi Nakamura, Sadafumi Nishihara

Chemistry of Materials· Volume 38· Issue 7
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Source abstract

Abstract

High Resolution Image Download MS PowerPoint Slide Host–guest chemistry has predominantly advanced within organic systems, whereas the integration of inorganic frameworks into such architectures remains limited. Here, we report two types of organic–inorganic hybrid macrocycles synthesized by cyclizing lacunary Wells–Dawson–type polyoxotungstates with oligo(ethylene oxide) chains. The resulting macrocycles exhibit distinct cavity structures depending on the chain length and show significantly enhanced hydrolytic stability in aqueous solution. The more stable host enables size-selective ion-exchange of the encapsulated K + ion with alkylammonium cations, whose exchanged forms were crystallographically characterized. Thermodynamic analyses revealed enthalpy–entropy compensation across the guest species, indicating a common binding mechanism governed by desolvation and host conformational changes. This strategy demonstrates a versatile approach for constructing robust hybrid hosts that combine the flexibility of organic macrocycles with the rigidity of inorganic clusters.
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Research context

OpenAlex topics: Polyoxometalates: Synthesis and Applications · Metal-Organic Frameworks: Synthesis and Applications · Layered Double Hydroxides Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, 753-8512, Japan

Chirality Research Center (CResCent), Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan

Funding

Precursory Research for Embryonic Science and Technology · Japan Society for the Promotion of Science · Japan Science and Technology Agency · JKA Foundation

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