Crystallographic and Structural Analysis of Heterometallic FeCu Complexes

Over 100 heterometallic FeCu complexes, from heterodi- to heteropolymeric have been included in this review. The complexes contain the FeCu, Fe2Cu, FeCu2, FeCuMo; Fe3Cu, Fe2Cu2, Fe2CuM (M=Hg or Co); Fe4Cu, Fe3CuTe; Fe4Cu2, Fe3Cu3; FeCu6, FeCu2Ru4; Fe4Cu4, Fe4Cu5; Fe6Cu5 and {FeCu}n metallic cores. The mean M-M bond distance elongated in the order: 2.520Å (Fe-Cu) < 2.638Å (Cu-Cu) < 2.663Å (Fe-Fe). The most common ligands for the iron atoms are C donors, and for copper atoms are O and N donors. There are several relationships between the M-L, M-L-M and L-M-L data, which are discussed and compared with those found in FeAu complexes.