The first heterometallic Mn–Ca cluster containing exclusively Mn(III) centers

The reaction of Mn(ClO4)2·6H2O with Ca(prop)2 and Me-saOH2 in MeCN yields the heterometallic polymeric complex {[MnIII6Ca2O2(Me-saO)6(prop)6 (H2O)2].2MeCN.0.95H2O}n (1) (prop = propionate; Me-saOH2 = 2-hydroxyphenylethanone oxime). Complex 1 consists of hexanuclear centrosymmetric [MnIII6O2(Me-saO)6]2+ units bridged by propionate calcium [Ca2(prop)6]2− centrosymmetric dimers. Magnetic measurements show that the hexanuclear magnetic core has an S = 4 ground state.