Solvothermal in situ generation of a Schiff-base ligand (L) in the presence NiCl(2) and trimesic acid (H(3)BTC) in ethanol resulted in clusters, Ni(8)(L)(4)Cl(8).(H(2)O)(0.5), consisting of three different coordination geometries, four paramagnetic and four diamagnetic Ni(II), exhibiting both ferromagnetic and antiferromagnetic exchange interactions.