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强交换耦合极大地减缓了空气稳定的钴（II）-自由基单分子磁体（SMM）中的磁化弛豫。

Strong Exchange Couplings Drastically Slow Down Magnetization Relaxation in an Air-Stable Cobalt(II)-Radical Single-Molecule Magnet (SMM).

作者信息

Albold Uta, Bamberger Heiko, Hallmen Philipp P, van Slageren Joris, Sarkar Biprajit

机构信息

Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany.

Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany.

出版信息

Angew Chem Int Ed Engl. 2019 Jul 15;58(29):9802-9806. doi: 10.1002/anie.201904645. Epub 2019 Jun 6.

DOI:10.1002/anie.201904645
PMID:31050153
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6771987/
Abstract

The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four-coordinate cobalt(II) building block into a strongly coupled fully air- and moisture-stable three-spin system, it proved possible to suppress under-barrier Raman processes leading to 350-fold increase of magnetization relaxation time and pronounced hysteresis. Relaxation times of up to 9 hours at low temperatures were found.

摘要

分子簇中导致磁双稳性的能垒由簇成分的磁各向异性决定。通过将高度各向异性的四配位钴（II）结构单元纳入强耦合的完全空气和湿气稳定的三自旋体系，已证明有可能抑制导致磁化弛豫时间增加350倍和明显磁滞现象的势垒下拉曼过程。在低温下发现弛豫时间长达9小时。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/9b8c77bfc091/ANIE-58-9802-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/2f87e5542d15/ANIE-58-9802-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/556fcc82f3bc/ANIE-58-9802-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/c55398f4d6d3/ANIE-58-9802-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/e1c3a6c73f7d/ANIE-58-9802-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/9b8c77bfc091/ANIE-58-9802-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/2f87e5542d15/ANIE-58-9802-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/556fcc82f3bc/ANIE-58-9802-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/c55398f4d6d3/ANIE-58-9802-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/e1c3a6c73f7d/ANIE-58-9802-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4e5f/6771987/9b8c77bfc091/ANIE-58-9802-g005.jpg

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