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Modular Bimetallic Complexes with a Sulfonamido-Based Ligand


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 OT, 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. All 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 states 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.

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Publication details

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, Accepted Manuscript
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    Modular Bimetallic Complexes with a Sulfonamido-Based Ligand

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

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