Palladium nanoparticles stabilized by a polyion complex composed of poly {4- chloromethylstyrene-co-(4-vinylbenzyl) tributylammonium chloride} and poly (acrylic acid) were easily recovered by filtration after pH treatment. The polyion complex stabilized palladium nanoparticles have high catalytic activity for the Suzuki and Heck reactions in water.
[Younes, S.; Tchani, G.; Baziard-Mouysset, G.; Stigliani, J. L.; Payard, M.; et al. European Journal of Medicinal Chemistry, 1994 , vol. 29, # 1 p. 87 - 94]