Crystallographic and Structural Analysis of Heterometallic FeAg Complexes

There are 30 heterometallic Fe/Ag complexes in this review. The complexes contain the following metallic cores: FeAg, Fe2Ag, FeAg2, FeAgW, Fe2Ag2, FeAg3, Fe4Ag, Fe3Ag2, Fe2Ag4, Fe2Ag2Pd2, Fe6Ag, Fe4Ag4, Fe4Ag5, Fe3Ag6 and {FeAg}n. The mean M-M bond distance elongated in the order: 2.614Å (Fe-Fe) < 2.660Å (Fe-Ag) < 2.806Å (Ag-Ag). The most common type of ligands is C donor for iron atoms, while for silver atoms are O and N donors. The inner coordination spheres about the iron atoms range from four to seven and ten (sandwiched) which is the most common. About the silver atoms from two to six, the four are the most common. The structural parameters are analyzed and compared with those of FeCu and FeAu complexes.