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.

• A new 3D manganese-organic frameworks (1) constructed by semi-rigid 5-((4′-(tetrazol-5′'-yl)benzyl)oxy)isophthalic acid has been synthesized. • 1 possesses left- and right- hand helical O-Mn-O chains constructed from trinuclear Mn 3 O 13 N 2 units by sharing vertex and eadge along b axis. • 1 shows high stability under different pH conditions and various organic solvents. • 1 exhibits excellent catalytic properties for cyanosilylation and knoevenagel condensation reactions of various aldehydes under solvent-free condition at room temperature. A new three-dimensional manganese-based metal–organic framework Mn 4 L 2 (HL)(H 2 O) 5 , (1), based on semi-rigid 5-((4′-(tetrazol-5′'-yl)benzyl)oxy)isophthalic acid ligand (H 3 L) have been prepared and characterized under solvothermal condition. In the structure of 1 , trinuclear Mn 3 O 13 N 2 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. [ABSTRACT FROM AUTHOR]