Conformational control of ligands to create a finite metal–organic cluster and an extended metal–organic framework

Abstract

While a twofold interpenetrated 3-D metal–organic framework, [Cu₃(L¹)₂(H₂O)₃]·14DMF·16H₂O (1) (where, L¹ is 4,4′,4′′-[1,3,5-benzenetriyltris(carbonylimino)]trisbenzoate and DMF is N,N′-dimethylformamide), with a (3,4)-connected pto net topology was prepared using a tricarboxylic acid linked via secondary benzamide as an extended 3-connected node and a Cu paddle-wheel secondary building unit as a planar 4-connected node, another tricarboxylic acid with methylated tertiary benzamide linkage in a folded geometry completely converted its role from diverging to chelating ligand and resulted in a finite Ni₁₄ metal–organic cluster, [Ni₁₄(μ³-OH)₈(L²)₆(formate)₂(DMF)₁₀(H₂O)₂]·28DMF·14H₂O (2) (where L² is N,N′,N′′-methyl-4,4′,4′′-[1,3,5-benzenetriyltris(carbonylimino)]trisbenzoate).