Antimony Tartrate Transition-Metal–Oxo Chiral Clusters
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A chiral precursor K2Sb2(l-tartrate)2 was used for the assembly of three homochiral heterometallic antimony(III)–tartrate transition-metal–oxo clusters: Mn(H2O)6[Fe4Mn4Sb6(μ4-O)6(μ3-O)2(l-tartrate)6(H2O)8]·10.5H2O (1), [V4Mn5Sb6(μ4-O)6(μ3-O)2(l-tartrate)6(H2O)13]·9.5H2O (2), and (H3O)[Ni(H2O)6]2[NiCrSb12(μ3-O)8(μ4-O)3(l-tartrate)6]·6H2O (3). In 1 and 2, the antimony tartrate dimer precursor decomposes and recombines to form Sb3(μ3-O)(l-tartrate)3 chiral trimers, which act as scaffolds to construct negative-charged [Fe4Mn4Sb6(μ4-O)6(μ3-O)2(l-tartrate)6]2– in 1 and neutral [V4Mn5Sb6(μ4-O)6(μ3-O)2(l-tartrate)6] in 2. The scaffold is flexible and accommodates different types of transition-metal–oxo clusters due to the different possible coordination modes of the l-tartrate ligand. In 3, a two-level chiral scaffold Sb3(μ3-O)(l-tartrate)3Sb3 is formed from the precursor. Two such scaffolds are linked by three bridging oxygen atoms to form a cavity occupied by one Cr3+ ion and one Ni2+ ion disordered over two positions. Cr3+ and Ni2+ ions are located in two face-shared MO6 octahedra at the center of a negatively charged [NiCrSb12(μ3-O)8(μ4-O)3(l-tartrate)6]3– cluster.
