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

Three new 5-nitro-1,2,3-benzenetricarboxylic acid based complexes, [Mn-7(nbta)(4)(Hnbta)(2,2'-bipy)(4)(H2O)(8)]center dot 2H(2)O (1), [(Mn3MnIII)-Mn-II(nbta)(3)(bimb)(1.5)center dot H2O]center dot 2H(2)O (2), [Mn-3(nbta)(2)(bix)(1.5)(mu(2)-H2O)center dot(H2O)(6)]center dot 2H(2)O (3) (H(3)nbta = 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 Mn-4 cores, displaying the alpha-Po net with 4(12)6(3) 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.