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

Five Mn II -sdba coordination polymers with mono-, di-, tri-, tetra-nuclear cores based on the V-shaped 4,4′-dicarboxybiphenyl sulfone (H 2 sdba) ligands: [Mn(sdba)(phen) 2 (H 2 O)] n ·3 n H 2 O ( 1 ), [Mn 2 (sdba) 2 (μ-H 2 O)(py) 4 ] n ( 2 ), [Mn 3 (sdba) 2 (Hsdba) 2 (2,2′-bipy) 2 ] n ( 3 ), [Mn 4 (sdba) 4 (4-mepy) 2 (H 2 O) 4 ] n ·2 n H 2 O ( 4 ) and [Mn 4 (sdba) 4 (bpp) 4 (μ-H 2 O) 2 ] n ·0.5 n H 2 O ( 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 Mn 4 units. The magnetic susceptibility studies in the 2–300 K range for these complexes reveal the existence of anti-ferromagnetic exchange interactions between the Mn II ions.