Single Isomer Heterometallic {CrIII 6MII 2} Rings Templated by Tetramethylammonium

A family of heterometallic rings [Me4N]2[CrIII 6MII 2F8(O2CtBu)16] is reported using tetramethylammonium hydroxide pentahydrate as the source of a template, where M = Zn, Mn, Ni, and Co. The metal cores are octagons with metal–metal edges bridged by one fluoride and two carboxylate ligands. The diva...

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Bibliographic Details
Published in:Inorganic chemistry 2021-10, Vol.60 (20), p.15675-15685
Main Authors: Alotaibi, Rajeh, Little, Edmund, Fowler, Jonathan M, Brookfield, Adam, Adams, Ralph W, Achari, Amritroop, Timco, Grigore A, Whitehead, George F. S, Chilton, Nicholas F, Nair, Rahul R, Collison, David, Winpenny, Richard E. P
Format: Article
Language:English
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Summary:A family of heterometallic rings [Me4N]2[CrIII 6MII 2F8(O2CtBu)16] is reported using tetramethylammonium hydroxide pentahydrate as the source of a template, where M = Zn, Mn, Ni, and Co. The metal cores are octagons with metal–metal edges bridged by one fluoride and two carboxylate ligands. The divalent metal ions are found ordered at positions 1 and 5 in the octagon. The tetramethylammonium cations are above and below the metal plane of the ring in the crystal structure. Magnetic studies show antiferromagnetic coupling between the paramagnetic metal ions present, leading to paramagnetic ground states in each case. 1H NMR spectroscopy confirms that the structure of the {CrIII 6CoII 2} ring exists in solution, and electron paramagnetic resonance spectroscopy confirms the magnetic structure of the other three rings.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.1c02342