Polycationic poly(ferrocenylsilane)s (PFS) with tunable amounts of PEG side chains were used for the condensation of DNA into polyplexes of 110 nm in 5.0 mM HEPES. The PFS-PEG/DNA polyplexes showed negligible aggregation, a strongly reduced protein adsorption, transfection activities comparable with linear polyethyleneimine and an excellent cytocompatibility.
