Abstract
Reaction of Na12[α-P2W15O56] · 18H2O with Mn(CH3COO)2 · 4H2O in the presence of K2S2O8 in acidic aqueous solution leads to isolation of a {} cluster-containing sandwich-type compound: αββα-K3Na11{(H2O)2(P2W15O56)2} · 40H2O (1). Single-crystal X-ray diffraction analysis revealed that 1 shows the well-known Weakley-type sandwich-type structure consisting of two trivacant [α-P2W15O56]12− Dawson moieties linked by a central symmetric rhomb-like mixed-valence manganese cluster via W–O–Mn and P–O–Mn connections. Mixed-valence Mn-cluster-substituted sandwich-type complexes based on trivacant Dawson units are rarely observed in polyoxometalate chemistry. Further, the sandwich-type polyoxoanions were connected by [K3Na2] clusters into a 44-layer. Magnetic study indicates that antiferromagnetic interactions exist in this compound.
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