Two Solvent-Dependent Zinc(II) Supramolecular Isomers: Rare kgd and Lonsdaleite Network Topologies Based on a Tripodal Flexible Ligand

Two Zn(II) supramolecular isomeric metal–organic frameworks (MOFs) based on well-designed tripodal tris(2-carboxyethyl)isocyanuric acid (H 3 tci), formulated as [(Me 2 NH 2 )Zn(tci)·0.5DMF] n ( 1 ) and [(Me 2 NH 2 )Zn(tci)·2DMF] n ( 2 ) (Me 2 NH 2 = protonated dimethylamine, DMF = N, N -dimethylformamide) have been solvothermally synthesized and characterized. Compounds 1 and 2 are supramolecular isomers controlled by solvent systems and exhibit a structural progression from a rare two-dimensional kgd sheet to a three-dimensional framework with unusual Lonsdaleite ( lon ) topology. The structural dissimilarity between them was dependent on the coordination environments of the Zn(II) ion and linking modes of the tci ligand influenced by solvent systems. The photoluminescence behaviors of 1 and 2 are also discussed.