Synthesis, crystal structures, and biological activities of silver(I) and cobalt(II) complexes with an azole derivative ligand

Two new complexes, [Ag(L)(2)](NO3)center dot(H2O) (1) and [Co(L)(2)Cl-2] (2) [L = 1-(imidazol-1-yl-methyl)-benzotriazole], have been synthesized and structurally characterized by X-ray diffraction techniques. In complex (1), the Ag(I) atom adopts a linear coordination geometry involving them imidazole nitrogens of two ligands. The [Ag(L)21 units are developed into a three-dimensional structure by intermolecular hydrogen bonds, pi-pi interactions, and Ag center dot center dot center dot O interactions. In complex (2), the Co(II) atom is in a distorted tetrahedral environment with two imidazole nitrogens and two chloride ligands. The [Co(L)(2)Cl-2] units are assembled into a three-dimensional structure by intermolecular hydrogen bonds and pi-pi interactions. The bioactivities of both complexes have been studied, and the results indicate that complex (1) exhibits excellent radical-scavenging (RS) and fungicidal (FG) activities while complex (2) only has weak fungicidal activity.