Size-selective catalytic activity of Pd nanoparticles encapsulated within end-group functionalized dendrimers.

摘要: The synthesis and size-selective catalytic activity of Pd nanoparticles encapsulated within dendrimers functionalized with different-sized end groups is described. We designed synthesized a series fourth-generation poly(amidoamine) having various extents steric crowding on their periphery. This was accomplished by reacting the terminal amine these epoxyalkanes substituted alkyl groups. modified were characterized 1H NMR, 13C matrix-assisted laser desorption ionization mass spectrometry. Nearly monodisperse (1.7 +/- 0.2 nm) interior dendrimers, resulting composite catalysts used for hydrogenation three alpha-allylic alcohols different sizes. results showed clear correlation between extent dendrimer surface turnover frequencies (TOFs) substrates: more led to lower TOFs.