Two cobalt(II) complexes with 5-(1H-benzotriazol-1-ylmethyl)isophthalate: synthesis, structural characterization and magnetism

Co(II) salts react with 5-(1H-benzotriazol-1-ylmethyl)isophthalic acid (H2L) under hydrothermal conditions to yield [Co(L)(py)(H2O)] (1) and [Co(L)] (2) [py=pyridine], which have been characterized by single crystal and powder X-ray diffractions, Infrared, elemental and thermogravimetric analysis. The two complexes have structures dependent on the different experimental conditions. As a result, 1 has a 1-D ladder structure, which can be further linked to build a 3-D framework through hydrogen bonding and interactions; 2 is a binodal (3,6)-connected 2-D kgd network with (4(3))(2)(4(6).6(6).8(3)) topology. Synthetic strategies on coordination modes of ligand and structures of resultant complexes are discussed. Magnetism of 2 was investigated.