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One-pot reaction of the Schiff base N , N '-ethylene bis(salicylaldimine) (H 2 L), CoCl 2 .6H 2 O, and [Ph 2 SnCl 2 ] in acetone produces the mixed valence Co II Co III  2 compound [Co II Co III  2 (μ-L) 2 (Ph) 2 (μ-Cl) 2 ]·(CH 3 ) 2 CO·H 2 O ( 1 ). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic Sn IV Co III ( 2 ) or monometallic Co III complex ( 3 ), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic Co II Co III  2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as τ ~0.6 s at T = 2.0 K and B  DC = 1.0 T.

A Mixed Valence CoIICoIII2 Field-Supported Single Molecule Magnet: Solvent-Dependent Structural Variation