The 1:1 reaction of 2-NHB>2(4,6-Me2pm) withCp2Mn in thf gives the novel heteroleptic imido/amidoMn(II) cage [(-Cp)Mn{2-NH(4,6-Me2pm)}·Mn{2-N(4,6-Me2pm)}]4 (1), composed of a central Mn(II) imido[Mn4{2-N(4,6-Me2pm)}4] core coordinated at the periphery by four [(-Cp)Mn{2-NH(4,6-Me2pm)}] monomerunits.