Structural versatility driven by the flexible di(4-pyridyl) sulfide ligand: from mononuclear cobalt(II) species to sheet-like copper(II) architectures☆

Add time:08/15/2019    Source:sciencedirect.com

The reaction between the ligand di(4-pyridyl)sulfide(dps) and two salts of divalent first row transition metals (M= Co2+, and Cu2+) resulted in three new compounds with formula: [Co(dps)4(H2O)2](ClO4)2⋅H2O (1), [Cu(dps)2(dmso)2]n(ClO4)2n (2) and [{Cu(dps)2(dmso)2}{Cu(dps)2(dmso)(H2O)}]n(ClO4)4n⋅2nH2O⋅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 andτ0= 5.3(1.2)x10−7 s.

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