Crystal structure, magnetic properties and topological analysis of three Mn-nitro-dicarboxylate polymers

Three polymeric manganese(II) complexes [ Mn ( H 2 O ) 2 ( NTA ) ] ∞ 2 1 , [ Mn ( H 2 O ) 2 ( TNA ) ] ∞ 2 2 and [ Mn ( H 2 O ) 3 ( FNA ) ] ∞ 1 3 (HNTA = 2-nitroterephthalic acid; HTNA = 3-nitrophthalic acid; HFNA = 4-nitrophthalic acid), were synthesized and characterized. Compounds 1, 2 and 3 are assembled into 3D supramolecular network via O–H⋯O hydrogen bonds interactions. The Variable-temperature (2–300 K) magnetic susceptibility measurements of 1–3 show overall antiferromagnetic interactions between the high-spin Mn(II) (S = 5/2) ions. Results about i.r. spectra, thermal and elemental analyses are presented.