2025-05-17 東京大学,東京理科大学,分子科学研究所,大阪公立大学,科学技術振興機構
柔軟性と秩序性を両立する分子性常磁性体。水中で温度に伴い構造が変化した。
＜関連情報＞
- https://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=27056
- https://www.issp.u-tokyo.ac.jp/news/wp-content/uploads/2025/05/press_0516_DithiolateCapsule.pdf
- https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202504967
水中で一軸性磁気異方性を示すニッケルジチオレートカプセルの巨視的構造転移 Macroscopic Structural Transition of Nickel Dithiolate Capsule with Uniaxial Magnetic Anisotropy in Water
Tomoko Fujino, Mafumi Hishida, Masatoshi Ito, Toshikazu Nakamura, Mizue Asada, Naoya Kurahashi, Hisao Kiuchi, Yoshihisa Harada, Koji Harano, Rie Makiura, Kanokwan Jumtee Takeno …
Advanced Science Published: 23 April 2025
DOI:https://doi.org/10.1002/advs.202504967
Abstract
Meeting the Internet of Things (IoT) demand for flexible organic spintronics requires dynamically flexible, “soft” organic magnetic materials. These materials should be capable of reordering their macroscopic assemblies in response to external stimuli. Unlike conventional rigid, “hard” crystalline organic paramagnets, that are typically composed of open-shell π- or d/π-conjugated planar molecules and rely on intermolecular interactions in the ordered, assembled structures, soft paramagnets necessitate a delicate balance between long-range structural order (essential for controlling magnetic properties) and dynamic flexibility a challenge previously unmet for open-shell planar molecules. In this study, an amphiphilic d/π-conjugated nickel dithiolate radical anion salt is presented that self-assembles into ordered membranes, forming capsule-like macrostructures with exceptional stability in aqueous environments. This design achieves the desired balance. These assemblies exhibit uniaxial magnetic anisotropy driven by significant spin–spin interactions and undergo temperature-dependent macroscopic structural transitions representing, to the knowledge, the first observation of such behavior for assemblies of open-shell planar molecules. This well-defined, single-molecular-weight system provides critical structural and mechanism insights for soft matter design and a versatile platform for spintronic applications. The findings advance the development of flexible, tunable molecular soft paramagnets, expanding their potential for innovative applications in flexible devices and beyond.
