title: Highly metallized polymers: synthesis, characterization, and lithographic patterning of polyferrocenylsilanes with pendant cobalt, molybdenum, and nickel cluster substituents.
abstract: High molecular weight, soluble, air- and moisture-stable, highly metallized (>25 wt% metal) polyferrocenylsilanes (PFS) [Fe(eta-C5H4)2Si(Me){Co2(CO)6C2Ph}]n (Co-PFS), [Fe(eta-C5H4)2Si(Me){Mo2-Cp2(CO)4C2Ph}]n (Mo-PFS), and [Fe(eta-C5H4)2Si(Me){Ni2Cp2C2Ph}]n (Ni-PFS) containing pendant cobalt, molybdenum, and nickel clusters, respectively, have been prepared via macromolecular clusterization of an acetylide-substituted PFS [Fe(eta-C5H4)2Si(Me)C(triple bond)CPh]n with [Co(2)(CO)8], [{MoCp(CO)(2)}2], or [{NiCp(CO)}2]. The extent of clusterization achieved was in the range of 70-75%. All three highly metallized polymers were demonstrated to function as negative-tone resists in electron-beam lithography, while Co-PFS and Mo-PFS were successfully patterned by UV-photolithography, allowing the fabrication of micron-sized bars, dots, and lines. These studies suggest that the highly metallized polymers may be useful in the fabrication of patterned arrays of alloy nanoparticles for both materials science and catalytic applications.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada, M5S 3H6.
authors.forename: Wing Yan
authors.initials: WY
authors.lastname: Chan
authors.forename: Scott B
authors.initials: SB
authors.lastname: Clendenning
authors.forename: Andrea
authors.initials: A
authors.lastname: Berenbaum
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Lough
authors.forename: Stephane
authors.initials: S
authors.lastname: Aouba
authors.forename: Harry E
authors.initials: HE
authors.lastname: Ruda
authors.forename: Ian
authors.initials: I
authors.lastname: Manners