Gil Yolimar, Castro-Alvarez Alejandro, Fuentealba Pablo, Spodine Evgenia, Aravena Daniel
Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago, Chile.
Centro para la Nanociencia y Nanotecnología (CEDENNA), Santiago, Estación Central, Región Metropolitana, Chile.
Chemistry. 2022 Aug 26;28(48):e202200336. doi: 10.1002/chem.202200336. Epub 2022 Jun 29.
Enhancement of axial magnetic anisotropy is the central objective to push forward the performance of Single-Molecule Magnet (SMM) complexes. In the case of mononuclear lanthanide complexes, the chemical environment around the paramagnetic ion must be tuned to place strongly interacting ligands along either the axial positions or the equatorial plane, depending on the oblate or prolate preference of the selected lanthanide. One classical strategy to achieve a precise chemical environment for a metal centre is using highly structured, chelating ligands. A natural approach for axial-equatorial control is the employment of macrocycles acting in a belt conformation, providing the equatorial coordination environment, and leaving room for axial ligands. In this review, we present a survey of SMMs based on the macrocycle belt motif. Literature systems are divided in three families (crown ether, Schiff-base and metallacrown) and their general properties in terms of structural stability and SMM performance are briefly discussed.
增强轴向磁各向异性是推动单分子磁体（SMM）配合物性能提升的核心目标。对于单核镧系配合物而言，必须调节顺磁离子周围的化学环境，以便根据所选镧系元素的扁长或长圆偏好，将强相互作用配体沿轴向位置或赤道平面排列。为金属中心实现精确化学环境的一种经典策略是使用高度结构化的螯合配体。轴向 - 赤道控制的一种自然方法是采用呈带状构象的大环，提供赤道配位环境，并为轴向配体留出空间。在本综述中，我们对基于大环带状结构的单分子磁体进行了概述。文献中的体系分为三个家族（冠醚、席夫碱和金属冠醚），并简要讨论了它们在结构稳定性和单分子磁体性能方面的一般性质。
