Zinc(II), ruthenium(II), rhodium(III), palladium(II), silver(I), platinum(II) and MoO22+ complexes of 2-(2′-hydroxy-5′-methylphenyl)-benzotriazole as simple or primary ligand and 2,2′-bipyridyl, 9,10-phenanthroline or triphenylphosphine as secondary ligands: Structure and anticancer activity