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Updated: Aug 19, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Disassembly Mechanisms and Energetics of Polymetallic Rings and Rotaxanes
Niklas Geue1, Tom S Bennett2, Alexandra-Ana-Maria Arama2
1Michael Barber Centre for Collaborative Mass Spectrometry, Department of Chemistry, Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, ManchesterM1 7DN, U.K.
Abstract:
Understanding the fundamental reactivity of polymetallic complexes is challenging due to the complexity of their structures with many possible bond breaking and forming processes. Here, we apply ion mobility mass spectrometry coupled with density functional theory to investigate the disassembly mechanisms and energetics of a family of heterometallic rings and rotaxanes with the general formula [NH2RR'][Cr7MF8(O2CBu)16] with M = MnII, FeII, CoII, NiII, CuII, ZnII, CdII. Our results show that their stability can be tuned both by altering the d-metal composition in the macrocycle and by the end groups of the secondary ammonium cation [NH2RR']+. Ion mobility probes the conformational landscape of the disassembly process from intact complex to structurally distinct isobaric fragments, providing unique insights to how a given divalent metal tunes the structural dynamics.
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