HEXAFLUOROPHOSPHATE SALTS OF CYCLOPENTADIENYLIRON(II) COMPLEXES OF DIBENZODIOXIN AND 1-METHYLDIBENZODIOXIN

The structures of ,4,4a,10a-eta(6))-dibenzo[b,e][1,4]dioxin]iron(II) h exafluorophosphate (1), [Fe(C5H5)(C12H8O2)]PF6, and a-eta(6))-1-methyl dibenzo[b,e][1,4]dioxin]iron(II) hexafluorophosphate diethyl ether sol vate (2), [Fe(C5H5)(C13H10O2)]PF(6.)0.5C(4)H(10)O, have been determine d. The dihedral angle between the outer rings of dibenzodioxin was fou nd to be 175.8(2) in (1) and 177.55(19)degrees in (2). The planes of t he coordinated arene and cyclopentadienyl (Cp) rings are nearly parall el for both complexes. The Fe atom is centered above the Cp ring while Fe-C distances involving the quaternary C atoms of the coordinated ar ene rings are slightly longer than those involving the other aromatic C atoms, particularly for complex (2). In the central dioxin ring of b oth complexes, O-C bonds of the coordinated ring are shorter than thos e of the uncoordinated ring.