CRYSTAL-STRUCTURE AND MAGNETIC-INTERACTIONS OF LOW DIMENSIONAL POLYMETALLIC COMPOUNDS

2,5-Bis(pyridin-2-yl)-1,3,4-oxadiazole (b.p.o.) behaves as a versatile ligand being able to coordinate one or several copper centers, with respect to the reactional conditions. The complexation by CuCl2 allows only the crystallisation of mononuclear species, even in presence of a large excess of Cu(II). Adding M(II)Cl2 (M(II) = Ni, Co, Mn) in the reactional mixture leads to the formation of homometallic linear Cu(II) chains. The molecular structures have been solved by X-ray diffraction experiments. The paramagnetic behaviour of the polymeric monodimensional compound characterizes the absence of Cu(II) coupling within the chain skeleton.