Enforcement of a high-spin ground state for the first 3d heterometallic 12-metallacrown-4 complex

Abstract

Cu(II)(DMF)₂Cl₂[12-MC_{Fe(III)N(Shi)}-4](DMF)₄·2DMF was synthesized as the first heterometallic transition metal 12-MC-4 complex. The purposeful placement of specific metal ions in the different sites of the metallacrown attains the establishment of a high-spin ground state. Inducing the anticipated superior exchange interactions, the central Cu(II) guest ion averts the common mutual cancellation of the spins, as is observed in the corresponding homometallic compounds.