Synthesis of triphenylphosphine-based microporous organic nanotube framework supported Pd catalysts with excellent catalytic activity

This work reports an efficient strategy to prepare a type of triphenylphosphine- based microporous organic nanotube framework (MONFs-PPh3) as a platform for Pd catalyst (MONFs-PPh3@Pd) via hyper-crosslinking core-shell multicomponent bottlebrush copolymers. The triphenylphosphine ligands not only act as functional groups, but as a supporting part of the nanotube walls. This novel material possesses great adjustability for the mesopore sizes of nanotubes and the concentration of triphenylphosphine ligands within the frameworks, which can be tuned during bottlebrush copolymer synthesis at the molecular level. Moreover,MONFs-PPh3@Pd exhibits excellent catalytic activity in the Suzuki-Miyaura reaction of aryl chlorides in aqueous media, which is much higher than that of the corresponding disordered microporous organic polymer-based Pd catalyst and homogeneous molecular catalysts under similar conditions.