PFpP macromolecules, synthesized via migration insertion polymerization of CpFe(CO)(2)(CH2)(3)PPh2 (FpP), exhibit reactive Fp end groups for further migration insertion reactions in the presence of phosphines. A number of alkyl diphenylphosphines with varied alkyl length, Ph(2)PCn (n = 6, 10, 18), have been prepared for the reaction, resulting in PFpP-PPh(2)Cn (n = 6, 10, 18) amphiphiles. The phosphines with longer alkyl chains impose steric hindrance for the reaction and therefore require longer reaction times and excess phosphines relative to PFpP.