Comparison of two Mn<sup>IV</sup>Mn<sup>IV</sup>-bis-μ-oxo complexes {[Mn<sup>IV</sup>(N<sub>4</sub>(6-Me-DPEN))]<sub>2</sub>(μ-O)<sub>2</sub>}<sup>2+</sup> and {[Mn<sup>IV</sup>(N<sub>4</sub>(6-Me-DPPN))]<sub>2</sub>(μ-O)<sub>2</sub>}<sup>2+</sup>
Acta crystallographica. Section E, Crystallographic communications