Enforcement of a high-spin ground state for the first 3d heterometallic 12-metallacrown-4 complexElectronic supplementary information (ESI) available: Experimental details; synthesis; X-ray crystallography - crystal structure information (Table S1), selected interatomic distances and angles (Tables S2-3), molecular structure of 2 (Fig. S4), numbering schemes with thermal ellipsoids (Fig. S1 and S5), packing diagrams (Fig. S2, S3, S6 and S7); elemental analysis - data; infrared spectroscopy - dat
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