Manganese-organic framework assembled by 5-((4′-(tetrazol-5″-yl)benzyl)oxy)isophthalic acid: A solvent-free catalyst for the formation of carbon–carbon bond

Abstract A new three-dimensional manganese-based metal-organic framework Mn4L2(HL)(H2O)5, (1), based on semi-rigid 5-((4’-(tetrazol-5’’-yl)benzyl)oxy)isophthalic acid ligand (H3L) have been prepared and characterized under solvothermal condition. In the structure of 1, trinuclear Mn3O13N2 units are linked each other by sharing vertex and edge to form left- and right- hand helical O-Mn-O chains along b axis, then adjacent left and right handed helical chains are interconnected by L3- and HL2- ligands to generate a 2D layer and L3- ligands with mode II connect the neighboring layers to form a 3D network. 1 shows high stability under different pH conditions and various organic solvents. After activation, 1 exhibits excellent catalytic properties for two typical C-C bond reactions, cyanosilylation and Knoevenagel condensation reaction of aldehydes, under solvent-free conditions at room temperature.