Self-Assembly Synthesis of a [2]Catenane CoII Single-Molecule Magnet

We describe herein the self-assembly synthesis of an octanuclear Co-II [2]catenane {[Co-4(H2L)(6)](2)(16+)} formed by the mechanical interlocking of two {[Co-4(H2L)(6)](8+)} rectangles of unprecedented topology. Subtle manipulation of the synthetic conditions allows the isolation of a mixed-valence [Co-2(III)/Co-2(II)](10+) non-catenated rectangle. The Co-II centers in the [2]catenane exhibit slow relaxation of their magnetic moment, i. e. single-molecule magnet properties, dominated by quantum tunneling and Raman relaxation processes. This work shows that metallo-supramolecular chemistry can precisely control the organization of single-molecule magnets in topologically complex arrangements.

Automated summary

This study describes the self-assembly synthesis of an octanuclear Co-II [2]catenane with unique magnetic properties. By manipulating the synthetic conditions, a mixed-valence non-catenated rectangle can also be obtained. The work demonstrates the precise control of single-molecule magnets in complex arrangements through metallo-supramolecular chemistry.