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Issue 35, 2018
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Modular bimetallic complexes with a sulfonamido-based ligand

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A series of bimetallic complexes prepared with the ligands N,N,N′,N′-tetramethylethane-1,2-diamine (TMEDA) and N,N′,N′′-[2,2′,2′′-nitrilotris(ethane-2,1-diyl)]tris(2,4,6-trimethylbenzenesulfonamido) ([MST]3−) is described. Four diiron compounds of the formulation (TMEDA)FeII(X)-(μ-OH)-FeIIIMST were prepared, in which the X ligands are the anions OTf, Br, SCN, or N3. Additionally, two heterobimetallic compounds of the formulation (TMEDA)MII(OTf)-(μ-OH)-FeIIIMST (MII = CoII or NiII) were synthesized. All these compounds have similar spectroscopic and structural properties. The diiron compounds exhibit perpendicular-mode electron paramagnetic resonance spectra consistent with S = 1/2 spin ground states, which is expected for high-spin FeII and FeIII centres that are antiferromagnetically coupled. The heterobimetallic (TMEDA)NiII(OTf)-(μ-OH)-FeIIIMST complex had a spin state of S = 3/2 that also resulted from antiferromagnetic coupling between the high-spin NiII and FeIII centres. The modularity of this system is further demonstrated by the substitution of the TMEDA ligand with ethylenediamine (en); for this species two equivalents of en coordinate to the FeII centre to form [(en)2FeII-(μ-OH)-FeIIIMST]OTf. These results demonstrate that a modular bimetallic system has been developed in which the key components can be modified.

Graphical abstract: Modular bimetallic complexes with a sulfonamido-based ligand

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The article was received on 15 Jun 2018, accepted on 01 Aug 2018 and first published on 01 Aug 2018

Article type: Paper
DOI: 10.1039/C8DT02455C
Citation: Dalton Trans., 2018,47, 12362-12372

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    Modular bimetallic complexes with a sulfonamido-based ligand

    N. Lau, Y. Sano, J. W. Ziller and A. S. Borovik, Dalton Trans., 2018, 47, 12362
    DOI: 10.1039/C8DT02455C

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