Chemistry
Cobalt and zinc halide complexes of 4-chloro and 4-methylaniline: Syntheses, structures and magnetic behavior
Abstract
A family of cobalt(II)and zinc(II)compounds with the general formula (4-subC6H4NH2)2MX2, (M = Co, Zn; X = Cl, Br; sub = CH3, Cl)has been prepared and the compounds characterized by single-crystal X-ray diffraction. The eight compounds crystallize in the monoclinic space group I2/a and are isocoordinate, but show different crystal packing for the 4-methyl and 4-chloroaniline complexes as a result of halogen bonding in the 4-chloroaniline family. The cobalt complexes have also been studied via variable temperature magnetic susceptibility measurements. All four Co(II)compounds exhibit antiferromagnetic exchange (maxima in χ are observed)and have been fitted with a 1D-chain model (cobalt chloride complexes, J ∼ −3 K)or a 2D-model (cobalt bromide complexes, J ∼ −4 K). Analysis of potential superexchange pathways is provided.