Three Cluster Organic Frameworks Constructed from Tetranuclear Cluster Units: Structure and Properties

: By treating a semirigid 5-oxyacetate isophthalic acid (H3 OAIP) ligand with MnSO4 /CoSO4 /CdSO4 under solvothermal conditions, three isostructural cluster organic frameworks, [M2 (OH)(OAIP)(DMA)]⋅H2 O (M=Mn2+ (1), Co2+ (2), Cd2+ (3); DMA=N,N'-dimethylacetamide) were constructed. The three complexes contain novel eight-connected tetranuclear M4 (OH)2 (COO)6 (OCH2 COO)2 clusters with the unique hexagonal bipyramidal configuration, which are extended by four-connected OAIP linkers to form an uncommon (4,8)-connected alb-4,8-Cmce topology based on (3,6)-connected kgd sublayers. Both 1 and 2 showed significant antiferromagnetic interactions between the intracluster metal ions, whereas 3 revealed strong blue photoluminescence.