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

• Published in: Polyhedron Vol. 154; pp. 436 - 442
• Main Authors: Mautner, Franz A., Traber, Magdalena, Fischer, Roland C., Torvisco, Ana, Reichmann, Klaus, Speed, Saskia, Vicente, Ramon, Massoud, Salah S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2018
• Subjects: 4-Methoxypyridine; Cobalt; Crystal structure, Magnetic properties; Thiocyanate; Crystal structure, Magnetic properties; 4-Methoxypyridine; Cobalt; Thiocyanate
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2018.08.022

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. [Display omitted] Three cobalt(II) isothiocyanato complexes with 4-methoxypyridine (4-MOP) as a co-ligand have been synthesized: catena-[Co(4-MOP)2(μ1,3-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(μ1,3-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.