Guillaume Viau, Maria Grazia Lombardi, Giovanni De Munno, Miguel Julve, Francesc Lloret, Juan Faus, Andrea Caneschi and Juan Modesto Clemente-Juan
A one-pot reaction of NiII 1, CoII 2, FeII 3 and MnII 4 with 2,2′-bipyridine (bipy) and azide in water leads to [M(bipy)(N3)2]n chains where the metal ion is alternatively bridged by double end-on (EO) and end-to-end (EE) azido bridges; theoretical analysis of the variable-temperature magnetic susceptibility data of 1 and 4 reveals the occurrence of intrachain alternating ferro- (through EO) and antiferro-magnetic (through EE) interactions.