Amine-Functionalized Microporous Organic Nanotube Frameworks Supported Pt and Pd Catalysts for Selective Oxidation of Alcohol and Heck Reactions

We report a synthesis of amine-functionalized microporous organic nanotube frameworks supported Pt or Pd catalysts (Pt or Pd@NH2-MONFs) by a combination of hyper cross-linking tricomponent bottlebrush copolymers and subsequent gentle reduction. In this method, the intrabrush and interbrush cross-linking of polystyrene (PS) shell layer in the tricomponent bottlebrush copolymers led to the formation of micropores and large-sized nanopores (meso/macrospores) in NH2-MONFs, respectively, while selective removal of polylactide (PLA) core layer generated mesoporous tubular structure. Interestingly, the middle functional poly(Boc-aminoethyl acrylamide) (PBAEA) component could be deprotected to produce the free amine moieties in the channel of MONFs, which will play a key role to anchor Pt or Pd nanoparticles on the support by an in situ reduction with NaBH4. Owing to their high special surface area, robust organic framework, and hierarchically porous structure, the resultant Pt or Pd@NH2-MONFs show high heterogeneous catalytic activity and excellent reusability in the selective oxidation of alcohol and Heck reactions, respectively.