Structural versatility driven by the flexible di(4-pyridyl) sulfide ligand: From cobalt(II) single-ion magnets to sheet-like copper(II) weak antiferromagnets

Abstract The reaction between the ligand di(4-pyridyl)sulfide(dps) and two salts of divalent first row transition metals (M= Co 2+ , and Cu 2+ ) resulted in three new compounds with formula: [Co(dps) 4 (H 2 O) 2 ](ClO 4 ) 2 ⋅H 2 O (1) , [Cu(dps) 2 (dmso) 2 ] n (ClO 4 ) 2n  (2) and [{Cu(dps) 2 (dmso) 2 }{Cu(dps) 2 (dmso)(H 2 O)}] n (ClO 4 ) 4n ⋅2nH 2 O⋅n(dmso) (3) . Crystal structures of 1 - 3 were determined using single-crystal X-ray diffraction. Crystal structures of 1 consists of mononuclear complexes, in which the dps ligand acts in a monodentate mode through one of the pyridyl nitrogen atoms. Compounds 2 and 3 present the dps ligand bridging metal centers leading to bidimensional coordination polymers. Magnetic properties in the polycrystalline samples of 1 - 3 in the 300 to 2K temperature range were investigated. Complex 1 exhibits a field-induced slow magnetization behavior and behaves as a single-ion magnet with an effective energy barrier for the reversal of magnetization of 22.9 (1.1) K andτ 0 = 5.3(1.2)x10 −7 s.