Air oxidation-induced single-crystal-to-single-crystal transformation of a mixed-valence tetranuclear Fe(II)-Fe(III) complex

A mixed valence tetranuclear iron complex [(Hpmide)FeII(NCSe)2FeIII(pmide)]2•5CH3OH (1) that undergoes oxidation and ligand exchange in the solid state (H2pmide = N-(2-pyridylmethyl)iminodiethanol). Upon air oxidation, 1 was converted into [(pmide)FeIII(NCSe)FeIII(pmide)]2(NCSe)2•2H2O (2),...