Structures and magnetic properties of 3D manganese(II)- and 2D pillar-layered copper(II)-organic framework derived from mixed carboxylate ligands

Highlights: • The 3D Mn(II)- and 2D Cu(II)-MOF were obtained based on mixed carboxylate ligands. • The Cu(II)-MOF has a 3-fold interpenetrated (4⁸.6²)-SP topology. • The Mn(II)-MOF displays antiferromagnetic ordering at low temperature. - Abstract: Two new metal–organic frameworks [Mn₃(MMA)₂(INA)₂]_n (1) and [Cu₂(FA)(INA)₃(H₂O)]_n (2, FA = formate) were prepared solvothermally by using mixed methylmalonic acid (H₂MMA) and isonicotinic acid (HINA) as the initial reactants. Single-crystal X-ray diffraction analyses reveal that complex 1 has a 3D framework structure consisting of 2D [Mn₃] layer units and INA connector, and 2 owns a 2D pillar-layered structure constituted of mononuclear-Cu(II)-based 2D layer unit and paddle-wheel dinuclear Cu(II) cluster-based pillared linker, which further interspersed with each other to form a 3-fold interpenetrated framework with a (4⁸.6²)-SP topology. The magnetic studies show that 1 displays antiferromagnetic ordering at low temperature, and a strong antiferromagnetic interaction exists in 2.