Syntheses, structures, and magnetic properties of a series of Mn-containing coordination polymers based on 5-nitro-1,2,3-benzenetricarboxylic acid and different N-donor ligands

Abstract

Three new 5-nitro-1,2,3-benzenetricarboxylic acid based complexes, [Mn₇(nbta)₄(Hnbta)(2,2′-bipy)₄(H₂O)₈]·2H₂O (1), [Mn^II₃Mn^III(nbta)₃(bimb)_1.5·H₂O]·2H₂O (2), [Mn₃(nbta)₂(bix)_1.5(μ₂-H₂O)·(H₂O)₆]·2H₂O (3) (H₃nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, 2,2′-bipy = 2,2′-bipyridine, bimb = 1,1′-(1,4-butanediyl)bis(imidazole), bix = 1,4-bis(imidazol-1-ylmethyl)benzene), were hydrothermally synthesized. Complex 1 exhibits a 3D framework constructed from Mn₄ cores, displaying the α-Po net with 4¹²6³ topology. Complexes 2 and 3 present a 2D network with multinuclear clusters as the linking nodes. All the complexes were suitably characterized by elemental analysis, FTIR spectra, thermogravimetric analysis and X-ray diffraction techniques. Moreover, direct current magnetic susceptibility measurements were carried out to study their magnetic properties.