九州大学 · 材料科学
Ohtani教授の研究室は、分子磁性と協調性を持つ金属有機フレームワーク、特にスピン遷移を示す協調性ポリマーを対象に、外部刺激（温度、ホスト・ゲスト相互作用、ホウ酸化状態変化など）に対する精密制御を追求しています。特に、イソチオシアネートやハロゲンなどのゲスト分子がフレームワークのスピン状態に与える影響を、熱力学的・構造的分析を基盤に解明しています。また、ゼロ熱膨張や異方的熱膨張を示す2次元協調性ポリマーの設計にも貢献しており、次世代スマートマテリアルの創出を目指しています。
Figures are computed from collected data and may differ slightly.
Precise control of spin transition temperature (T(c)) is one of the most important challenges in molecular magnetism. A Hofmann-type porous coordination polymer {Fe(pz)[Pt(II)(CN)(4)]} (1; pz = pyrazine) exhibited cooperative spin transition near room temperature (T(c)(up) = 304 K and T(c)(down) = 284 K) and its iodine adduct {Fe(pz)[Pt(II/IV)(CN)(4)(I)]} (1-I), prepared by oxidative addition of iodine to the open metal sites of Pt(II), raised the T(c) by 100 K. DSC and microscopic Raman spectra
Abstract The host–guest composites of Hofmann‐type iron(II) spin‐transition (ST) porous coordination polymers incorporating guest molecules show guest‐dependent ST behavior in accordance with the respective guest species, which may be a gas, solvent, halogen, or organic molecule. The guest also works as a chemical stimulant to switch the spin state of the host between high and low spin at room temperature. In this review, we discuss guest properties including size, shape, flexibility, chemical p
Abstract Two 2D Hofmann‐type spin‐crossover coordination polymers, [Fe(stpy) 2 Pt(CN) 4 ] · 0.5MeOH (stpy = 4‐styrylpyridine; 1 ) and [Fe(pep) 2 Pt(CN) 4 ] {pep = 4‐(2‐phenylethyl)pyridine; 2 }, have been prepared by using long co‐ligands with different flexibilities. These compounds form 3D interdigitate structures based on 2D layers extended by Pt–CN–Fe linkages with different interlayer structures depending on the nature of the axial co‐ligand. The stpy co‐ligand forms one‐directional π–π net
Subarachnoid extension of the hematoma on CT strongly indicates a non-hypertensive cause, and more specifically, it suggests lobar ICH caused by vascular abnormalities.
The ability to tune physical properties is attractive for the development of new materials for myriad applications. Understanding and controlling the structural dynamics in complicated network structures like coordination polymers (CPs) is particularly challenging. We report a series of two-dimensional CPs [Mn(salen)]<sub>2</sub>[M(CN)<sub>4</sub>]· xH<sub>2</sub>O (M = Pt (1), PtI<sub>2</sub> (2), and MnN (3)) incorporating zigzag cyano-network layers that display composition-dependent anisotro
Zero in-plane thermal expansion (TE) in a two-dimensional (2D) coordination polymer is demonstrated. The combination of components that expand and those that shrink into zigzag layers results in no net area change in the 2D materials with temperature. Single crystals of [Mn(salen)]<sub>2</sub>[Mn(N)(CN)<sub>4</sub>(guest)] (salen = N,N'-ethylenebis(salicylideneaminato), guest = MeOH and MeCN) were prepared, and variable-temperature single-crystal X-ray structural analyses demonstrated that these
Metal node design is crucial for obtaining structurally diverse coordination polymers (CPs) and metal-organic frameworks with desirable properties; however, Fe<sup>II</sup> ions are exclusively six-coordinated. Herein, we present a cyanide-bridged three-dimensional (3D) CP, FePd(CN)<sub>4</sub> , bearing four-coordinate Fe<sup>II</sup> ions, which is synthesized by thermal treatment of a two-dimensional (2D) six-coordinate Fe<sup>II</sup> CP, Fe(H<sub>2</sub> O)<sub>2</sub> Pd(CN)<sub>4</sub> ⋅4
Recently, non-crystalline coordination materials have been shown to represent a versatile class of functional materials. However, such materials incorporating metal complex clusters have remained largely unexplored. Herein, we demonstrate that a luminescent tetranuclear ReV cluster melts at 489 K, with the cluster structure being maintained in the corresponding supercooled ionic liquid phase.
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