Figure 2. Structure of the Fe, O, core of [Fe, L, O,(OH),]'showing 50% probability ellipsoids and atom labeling scheme. The tetrahedral iron core is cumulatively bridged on each edge by two phenolates (Fel-012, 2.074 (3) A; Fe2-012, 2.084 (3) A), two hydroxides (Fel-011 and Fe2-022, both 1.989 (2) A), and two oxo ligands (Fel-021, 1.792 (3) A; Fe2-021, 1.790 (3) A). The iron-iron separations across the phenolate, the hydroxo, and the oxo bridges are ...