瑞士苏黎世联邦理工学院Christophe Copéret团队利用表面硅氧化合物电子提高单分子磁体的弛豫性能。 相关研究成果发表在2021年4月5日出版的国际学术期刊《美国化学会杂志》。

单分子磁体在量子计算和自旋电子学中有着无与伦比的信息存储密度和应用前景。迄今为止，最成功的SMMs是有机金属镧系配合物。然而，其表面固定仍然是器件制造和商业应用的一个重要要求，由于磁性能对SMM母体电子结构的微小变化敏感，因此仍具有挑战性。因此，寻找SMM表面沉积的控制方法是一个紧迫的挑战。

该文中，研究人员应用了等概率的概念来确定存在于部分脱羟基二氧化硅表面的硅氧烷，作为有机金属表面修饰材料中典型配体结构的合适替代物。从理论和实验上证明，孤立的硅氧化合物锚定位点不仅能成功地固定，而且能使磁化弛豫时间增加2个数量级。

附：英文原文

Title: Leveraging Surface Siloxide Electronics to Enhance the Relaxation Properties of a Single-Molecule Magnet

Author: Maciej D. Korzyński, Zachariah J. Berkson, Boris Le Guennic, Olivier Cador, Christophe Copéret

Issue&Volume: April 5, 2021

Abstract: Single-molecule magnets (SMMs) hold promise for unmatched information storage density as well as for applications in quantum computing and spintronics. To date, the most successful SMMs have been organometallic lanthanide complexes. However, their surface immobilization, one of the requirements for device fabrication and commercial application, remains challenging due to the sensitivity of the magnetic properties to small changes in the electronic structure of the parent SMM. Thus, finding controlled approaches to SMM surface deposition is a timely challenge. In this contribution we apply the concept of isolobality to identify siloxides present at the surface of partially dehydroxylated silica as a suitable replacement for archetypal ligand architectures in organometallic SMMs. We demonstrate theoretically and experimentally that isolated siloxide anchoring sites not only enable successful immobilization but also lead to a 2 orders of magnitude increase in magnetization relaxation times.

DOI: 10.1021/jacs.1c00706

Source: https://pubs.acs.org/doi/10.1021/jacs.1c00706