A cationic 24-MC-8 manganese cluster with ring metals possessing three oxidation states [Mn II 4 Mn III 6 Mn IV 2 (μ 4 -O) 2 (μ 3 -O) 4 (μ 3 -OH) 4 (μ 3 -OCH 3 ) 2 (pko) 12 ](OH)(ClO 4 ) 3

Reaction of Mn(ClO4)2 with di-pyridyl ketone oxime, (2-py)2C=NOH, gives the novel cluster [Mn(II)4Mn(III)6Mn(IV)2(mu4-O)2(mu3-O)4(mu3-OH)4(mu3-OCH3)2(pko)12](OH)(ClO4)3 1. It is the only example of a 24-MC-8, and the first metallacrown with ring metal ions in three different oxidation states. Magnetic measurements show antiferromagnetic behavior.