Assembly of Two Novel Cd3/(Cd3 + Cd5)-Cluster-Based Metal–Organic Frameworks: Structures, Luminescence, and Photocatalytic Degradation of Organic Dyes

Two new three-dimensional (3D) multinodal Cd(II)-organic frameworks, [Cd-3(dccpa)(bipy)(0.5)(H2O)(4)]center dot 5H(2)O (1) and [(CH3)(2)NH2](2)-[Cd-11(dccpa)(4)(DMF)(4)(H2O)(8)]center dot 4H(2)O (2) (H(6)dccpa = 3,4-di(3,5-dicarboxyl phenyl) phthalic acid, bipy = 4,4'-bipyridine), have been prepared and fully characterized. Compound 1 possesses a 3D neutral framework with a new (6,6,7) connected topology based on a single trinuclear cluster, while 2 features a 3D anionic framework with a new (5,6,6,10)-connected topology containing mixed trinuclear and pentanuclear clusters. Remarkably, 1 and 2 show promising photocatalytic activities toward the degradation of rhodamine B and methyl blue, which suggests that different kinds of cluster units may exert different impacts on the decomposition of organic dyes.