Synthesis and structural characterization of isothiocyanato-4-methoxypyridine-cobalt(II) complexes with diverse geometries and a bridged 1D coordination polymer showing metamagnetic transition.

Graphical abstract Three thiocyanato cobalt(II) complexes with 4-methoxypyridine as co-ligand were synthesized, and were characterized by X-ray structural methods, IR and UV–Vis spectroscopy, magnetic susceptibility and thermogravimetric measurements. Abstract Three cobalt(II) isothiocyanato complexes with 4-methoxypyridine (4-MOP) as a co-ligand have been synthesized: catena -[Co(4-MOP) 2 (μ 1,3 -NCS) 2 ] (1), trans -[Co(4-MOP) 4 (NCS) 2 ] (2), and [Co(4-MOP) 2 (NCS) 2 ] (3) and structurally characterized by IR, UV–Vis spectroscopy and single crystal X-ray diffraction. The complexes 2 and 3 are discrete monomeric species with octahedral and tetrahedral geometries, respectively whereas the catena -[Co(4-MOP) 2 (μ 1,3 -NCS) 2 ] (1) is featuring a polymeric 1D system with doubly bridging NCS− groups through the terminals N - and S -donor atoms in a trans octahedral geometry. The thermoanalytical behavior of 1 – 3 is reported. Magnetic susceptibility of the bridged-isothiocyanato coordination polymer 1 was studied down to a temperature of 2 K and at various magnetic dc and ac fields. These measurements indicate a metamagnetic transition in 1. [ABSTRACT FROM AUTHOR]