Adifluorine complex is a molecularcoordination complex involving adifluorine (F2) group as aligand. The first example wasgold heptafluoride (AuF7).[1] Instead of being a gold(VII) compound, with all five fluorine atoms equally bonded to the central gold atom, the structure is anadduct ofgold(V) fluoride (AuF5) and F2. This conclusion has been repeatedly supported by calculations.
Although otherdiatomic element complexes exist, difluorine complexes have a differenthapticity.Dinitrogen complexes of main-group elements anddihydrogen complex feature a "side-on" bonding of the hydrogen group with both hydrogen atoms participating in the coordinate bonding (η2-H2), whereas difluorine complexes feature "end-on" bonding with only one of the two fluorine atoms participating in the coordinate bonding (η1-F2).[2]
