Extending the Distance Range in Double Electron–Electron Resonance Measurements of Transition Metal Clusters
Year: 2026
Type: article
Abstract: We report ligand manipulation of high-nuclearity, paramagnetic transition metal clusters based on heterometallic {Cr 7 Ni} 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 {Cr 7 Ni} rings about organic threads. The crystal structures of these supramolecules are reported and are in excellent agreement with the DEER results.
DOI: 10.1021/jacs.5c20715
Institution: University of Manchester
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G162407419, G1872917083, G2420245581, Magnetic Properties Measurement System for Manchester and National EPR Facility, G4099111048, G4273898733, G464864247, G5092458911, High Intensity High Sensitivity X-ray Diffaction, G624536980, High Resolution High Throughput Mass Spectrometry to Characterise Materials, Chemicals, and BioCatalysts, EPR NRF Core Equipment Bid, Capital Award for Core Equipment 2022/23, National Research Facility for Electron Paramagnetic Resonance Spectroscopy, Light switchable molecular qugates, A National Research Facility for EPR Spectroscopy, 2022-2027
OpenAlex ID: W7123346915