Manganese(II) complexes with V-shaped sulfonyldibenzoate: The 3D structures with interpenetrated threefold or tetra-nuclear manganese(II) units

Five MnII-sdba coordination polymers with mono-, di-, tri-, tetra-nuclear cores based on the V-shaped 4,4′-dicarboxybiphenyl sulfone (H2sdba) ligands: [Mn(sdba)(phen)2(H2O)]n·3nH2O (1), [Mn2(sdba)2(μ-H2O)(py)4]n (2), [Mn3(sdba)2(Hsdba)2(2,2′-bipy)2]n (3), [Mn4(sdba)4(4-mepy)2(H2O)4]n·2nH2O (4) and [Mn4(sdba)4(bpp)4(μ-H2O)2]n·0.5nH2O (5) (phen = 1,10-phenanthroline, 2,2′-bipy = 2,2′-bipyridine, 4-mepy = 4-picoline, bpp = 1,3-bi(pyridine-4-yl)propane) were hydrothermally synthesized and structurally characterized. The M–O–C metal clusters in above complexes act as SBUs, and the V-shaped sdba ligands link the SBUs to generate the novel frameworks. In complexes 1 and 3 their 1D chains are linked into the 2D planes through various hydrogen bonding. Complex 2 displays the 3D structure with interpenetrated threefold, while complexes 4 and 5 both exhibit the 3D structures with the tetra-nuclear Mn4 units. The magnetic susceptibility studies in the 2–300 K range for these complexes reveal the existence of anti-ferromagnetic exchange interactions between the MnII ions.