Two self-interpenetrating magnetic Mn(II) metal-organic frameworks assembled from rigid or flexible tripodal multicarboxylate ligands

Assembly of two tripodal multicarboxylic ligands, namely rigid 3,4-bis(4-carboxyphenyl)-benzoic acid (H3L1) and flexible 3,5-bis(4-carboxyphenoxy)-benzoic acid (H3L2) with MnCl2 under hydrothermal conditions afforded two distinct metal-organic frameworks (MOFs), {[Mn3(L1)2(H2O)4](H2O)2}n (1) and {[Mn3(L2)2(H2O)4](H2O)4}n (2), respectively. Interestingly, both complexes possess different 3D networks of novel self-interpenetrating prototype, constructing from different 2D [Mn(COO)2]n polymeric motifs. Furthermore, the thermal and magnetic properties of 1 and 2 are studied.