S. Wöhlert, C. Näther
Mar 22, 2013
Citations
0
Influential Citations
11
Citations
Journal
Polyhedron
Abstract
Abstract Reaction of cobalt(II) thiocyanate and pyridazine in water under hydrothermal conditions leads to the formation of [Co2(NCS)4(pyridazine)2(H2O)]n (1-Co), whereas the reaction of nickel(II) thiocyanate with pyridazine in methanol under similar conditions results in the formation of [Ni2(NCS)4(pyridazine)2(CH3OH)]n (1-Ni). In their crystal structure the metal cations are linked via μ-1,3- and μ-1,1-thiocyanato anions as well as bridging pyridazine ligands into chains, which are further connected into layers by O–H⋯S hydrogen bonding. Investigations on the thermal behavior show that in both compounds the solvent molecules can be removed, which lead to the formation of compounds of composition [M2(NCS)4(pyridazine)2]n (M = cobalt, 2-Co; nickel, 2-Ni). XRPD investigations indicate that both compounds are isotypic and IR spectroscopic investigations indicate that a more condensed thiocyanato network has formed. On rehydration 2-Co and 2-Ni retransforms into hydrates, which are isotypic and which exhibits powder patterns different from those of 1-Co and 1-Ni. If 2-Co and 2-Ni a stored in a methanol atmosphere an unknown crystalline phase is formed for 2-Ni, whereas the cobalt compound transforms into the methanol solvate [Co3(NCS)6(pyridazine)2]·(CH3OH)2 known in literature. Magnetic measurements reveal that compounds 1-Co and 1-Ni shows an antiferromagnetic ordering at TN = 9.6 and 4.7 K.