Two new complexes, [Ag(L) 2 ](NO 3 ) Á (H 2 O)(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 the imidazole nitrogens of two ligands. The [Ag(L) 2 ] units are developed into a three-dimensional structure by intermolecular hydrogen bonds, p-p interactions, and AgÁÁÁO 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 p-p 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.

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Three new complexes, [Co(L) 2 (SCN) 2 ] (1), [Co 2 (L) 4 (l-N 3 ) 2 ](ClO 4 ) 2 (H 2 O) 1.5 (2), and [Ni(L) 3 ](ClO 4 ) 2 -(CH 3 OH) 2 (3), have been synthesized and structurally characterized, where L is 3-(3 0 ,5 0 -dimethyl-pyrazole)-6-Clpyridazine. Single crystal X-ray analyses show that all three complexes crystallize in the monoclinic crystal system. In complex (1), the Co(II) atom is in a distorted octahedral environment consisting of four nitrogen atoms from two ligands and two nitrogen atoms of SCN -, which is further extended into a 1D chain by intermolecular hydrogen bonds. Two Co(II) atoms in complex (2) are linked by two azide anions in a l-1,1 mode to make a binuclear structure. Without any auxiliary ligand, the Ni(II) atom in complex (3) adopts a distorted octahedral geometry involving six nitrogen atoms from three ligands. The electronic absorption spectra of the title compounds are discussed as well. The effects of auxiliary ligands on the structures and properties of the title complexes have been studied and discussed.Electronic supplementary material The online version of this article (