Tunable Surface Area, Porosity, and Function in Conjugated Microporous Polymers.

Jie Chen,Veronica Del Angel Hernandez,Charl F J Faul,Esther J Townsend,Wei Yan,Long Pan,Jiangtao Feng

doi:10.1002/anie.201905488

Abstract

Simple inorganic salts are used to tune N‐containing conjugated microporous polymers (CMPs) synthesized by Buchwald–Hartwig (BH) cross‐coupling reactions. Poly(triphenylamine), PTPA, initially shows a broad distribution of micropores, mesopores, and macropores. However, the addition of inorganic salts affects all porous network properties significantly: the pore size distribution is narrowed to the microporous range only, mimicking COFs and MOFs; the BET surface area is radically improved from 58 m2 g−1 to 1152 m2 g−1; and variations of the anion and cation sizes are used to fine‐tune the surface area of PTPA, with the surface area showing a gradual decrease with an increase in the ionic radius of salts. The effect of the salt on the physical properties of the polymer is attributed to adjusting and optimizing the Hansen solubility parameters (HSPs) of solvents for the growing polymer, and named the Beijing–Xi'an Jiaotong (BXJ) method.

Highlights

Simple inorganic salts are used to tune N-containing conjugated microporous polymers (CMPs) synthesized by Buchwald–Hartwig (BH) cross-coupling reactions
The addition of inorganic salts affects all porous network properties significantly: the pore size distribution is narrowed to the microporous range only, mimicking covalent organic frameworks (COFs) and metal–organic frameworks (MOFs); the BET surface area is radically improved from 58 m2 gÀ1 to 1152 m2 gÀ1; and variations of the anion and cation sizes are used to fine-tune the surface area of PTPA, with the surface area showing a gradual decrease with an increase in the ionic radius of salts
Buchwald–Hartwig (BH) coupling has been utilized in CMP design and synthesis, where CÀN bonds are created in the polymer network by the palladium-catalyzed cross-coupling ofamines with aryl halides.[2]

Summary

Introduction

Simple inorganic salts are used to tune N-containing conjugated microporous polymers (CMPs) synthesized by Buchwald–Hartwig (BH) cross-coupling reactions.

Results

Conclusion