Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 48, Pages 14244-14269Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502730
Keywords
carboxylate clusters; heterometallic rings; metallocycles; molecular magnets; supramolecular chemistry
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Funding
- EPSRC(UK) [GR/57396/01, GR/T28652, EP/D05138X, EP/H011714, EP/J009377/1, EP/L018470/1, EP/K039547/1]
- NoWNANO
- European Commission through Marie Curie Fellowships
- European Commission through a FET-OPEN project
- ILL
- Royal Society
- Engineering and Physical Sciences Research Council [EP/L018470/1, EP/I02249X/1, EP/J009377/1, EP/K039547/1] Funding Source: researchfish
- EPSRC [EP/I02249X/1, EP/K039547/1, EP/L018470/1, EP/J009377/1] Funding Source: UKRI
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An enormous family of heterometallic rings has been made. The first were Cr7M rings where M = Ni-II, Zn-II, Mn-II, and rings have been made with as many as fourteen metal centers in the cyclic structure. They are bridged externally by carboxylates, and internally by fluorides or a penta-deprotonated polyol. The size of the rings is controlled through templates which have included a range of ammonium or imidazolium ions, alkali metals and coordination compounds. The rings can be functionalized to act as ligands, and incorporated into hybrid organic-inorganic rotaxanes and into molecules containing up to 200 metal centers. Physical studies reported include: magnetic measurements, inelastic neutron scattering (including single crystal measurements), electron paramagnetic resonance spectroscopy (including measurements of phase memory times), NMR spectroscopy (both solution and solid state), and polarized neutron diffraction. The rings are hence ideal for understanding magnetism in elegant exchange-coupled systems.
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