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Updated: Jan 14, 2026

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Extending the Distance Range in Double Electron-Electron Resonance Measurements of Transition Metal Clusters
Selena J Lockyer1, Lubomir Loci1, Adam Brookfield1
1Department of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, U.K.
Abstract:
We report ligand manipulation of high-nuclearity, paramagnetic transition metal clusters based on heterometallic {Cr7Ni} rings to significantly prolong electron spin phase memory time constants. This enables the application of Double Electron-Electron Resonance (DEER) spectroscopy methods to measure cluster···cluster interactions to longer distances. Specifically, replacing bridging pivalates by cyclopropyl-carboxylates enables DEER up to 4.2 nm. This is applied to four new hybrid [2]- and [3]rotaxanes based on hetero- and homodimers, respectively, of {Cr7Ni} rings about organic threads. The crystal structures of these supramolecules are reported and are in excellent agreement with the DEER results.
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