A series of manganese–carboxylate coordination polymers exhibiting diverse magnetic properties†
Abstract
The hydrothermal reactions of an asymmetrical 4-(4-carboxyphenylamino)-3,5-dinitrobenzoic acid (H2cpdba), MnCl2·4H2O, or together with and C2/c, respectively. 2 exhibits a 1D chain structure, which is extended into a 3D supramolecular network by π–π stacking interactions, while 3 features a quite complex 3D network built up from the cpdba2− and 4,4′-bpy spacers as well as the carboxylate-bridged Mn(II) chains. Both 2 and 3 show weak antiferromagnetic coupling interactions (J = −0.55 cm−1 for 2), and a field-induced spin-flop magnetic transition can also be observed in 2 at ca. 3.2 T at 2 K.