A 3D photoluminescent cadmium(II)-organic framework with unusual pentanuclear cluster as secondary building unit

A crystalline 3D MOF with unique pentanuclear Cd(II)-cluster as SBU, [Cd5(H2O)4(ap)3(trz)4]n (1) (H2ap = adipic acid, Htrz = 1,2,4-triazole), was isolated by hydrothermal method, which exhibits strong Htrz-based luminescent emission. More interestingly, ap ligands in 1 were observed to play the important roles for both the aggregate of polynuclear motif and the extension of the infinite 3D framework.