A structure and magnetic properties of one-dimensional manganese/cobalt coordination polymers with 5-nitro-1,3-benzenedicarboxylic acid and imidazole

One-dimensional manganese(II) complex, [Mn₂(5-nbdc)₂(imH)₆] · 2H₂O (1) (5-nbdcH₂ = 5-nitro-1,3-benzenedicarboxylic acid and imH = imidazole), has been hydrothermally synthesized and structurally characterized by X-ray crystallography with the following data: orthorhombic, space group Pna2(1), M _r = 972.63 for Mn₂C₃₄H₃₄N₁₄O₁₄, a = 13.3391(12) Å, b = 16.4657(15) Å, c = 18.2177(16) Å; V = 4001.3(6) ų, Z = 4, D _calcd 1.615 g cm^?3, µ = 0.718 mm^?1, the final R = 0.0490 and wR = 0.1277 for 7278 observed reflections (I > 2σ(I)). Complex 1 exhibits very weak intra-chain ferromagnetic coupling (J k^?1 = 0.001 K) with g = 1.930. The magnetism of a one-dimensional cobalt(II) complex [Co(5-nbdc)₂(imH)₂] _n (2) indicates weak intra-chain anti-ferromagnetic coupling (J k^?1 = ?0.067 K) with g = 2.0791.