Design, Synthesis and Characterization of Nickel‐Functionalized Covalent Organic Framework NiCl@RIO‐12 for Heterogeneous Suzuki–Miyaura Catalysis

• Published in: Chemistry : a European journal Vol. 26; no. 9; pp. 2051 - 2059
• Main Authors: Maia, Renata A., Berg, Fabienne, Ritleng, Vincent, Louis, Benoît, Esteves, Pierre M.
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 11.02.2020; Wiley-VCH Verlag
• Subjects: Catalysis; Catalytic activity; Chemical Sciences; Chemistry; covalent organic frameworks; Cross coupling; heterogeneous catalysis; Material chemistry; microporous materials; microwave heating; Nickel; Nickel chloride; Recyclability; Thermal stability; microwave heating; nickel; covalent organic frameworks; heterogeneous catalysis; microporous materials
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.201904845

A series of nickel‐decorated covalent organic frameworks, NiCl@RIO‐12, were prepared using the post‐synthetic modification strategy, that is, by reacting NiCl2 with pristine RIO‐12 under alkaline conditions. Interestingly, they retained their crystallinity and the amount of nickel incorporated could be tuned from 3.6 to 25 wt % according to the reaction conditions. The incorporation of a higher amount of nickel in NiCl@RIO‐12 consistently led to a lower Brunauer–Emmett–Teller surface area. Additionally, no agglomeration of nickel particles was found and a relatively homogeneous dispersion of nickel could be ascertained by SEM and TEM‐EDS. The paramagnetic material exhibited promising catalytic activity in Suzuki–Miyaura cross‐coupling under microwave heating. Thus, NiCl@RIO‐12 notably demonstrated good thermal stability and its recyclability showed no substantial loss of activity after 3 cycles. Ni‐functionalized COF for heterogeneous catalysis: Nickel‐decorated COF materials NiCl@RIO‐12 were synthetized with tuneable amount of nickel incorporation from 3.6 to 25 wt %. The paramagnetic material exhibited promising catalytic activity in Suzuki–Miyaura cross‐coupling reactions under microwave heating. NiCl@RIO‐12 demonstrated good thermal stability and its recyclability showed no substantial loss of activity after 3 cycles.