In:
Chemistry – An Asian Journal, Wiley, Vol. 18, No. 6 ( 2023-03-14)
Abstract:
The fixation of atmospheric CO 2 into value‐added products is a promising methodology. A series of novel nickel(II) complexes of the type [Ni(L)(CH 3 CN) 2 ](BPh 4 ) 2 1 – 5 , where L= N,N ‐bis(2‐pyridylmethyl)‐ N′, N′ ‐dimethylpropane‐1,3‐diamine (L1), N,N ‐dimethyl‐ N′ ‐(2‐(pyridin‐2‐yl)ethyl)‐ N′ ‐(pyridin‐2‐ylmethyl) propane‐1,3‐diamine (L2), N,N ‐bis((4‐methoxy‐3,5‐dimethylpyridin‐2‐ylmethyl)‐ N′,N′ ‐dimethylpropane‐1,3‐diamine (L3), N ‐(2‐(dimethylamino) benzyl)‐ N′,N′ ‐dimethyl‐ N ‐(pyridin‐2‐ylmethyl) propane‐1,3‐diamine (L4) and N,N ‐bis(2‐(dimethylamino)benzyl)‐ N′, N′ ‐dimethylpropane‐1,3‐diamine (L5) have been synthesized and characterized as the catalysts for the conversion of atmospheric CO 2 into organic cyclic carbonates. The single‐crystal X‐ray structure of 2 was determined and exhibited distorted octahedral coordination geometry with cis ‐α configuration. The complexes have been used as a catalyst for converting CO 2 and epoxides into five‐membered cyclic carbonates under 1 atmospheric (atm) pressure at room temperature in the presence of Bu 4 NBr. The catalyst containing electron‐releasing −Me and ‐OMe groups afforded the maximum yield of cyclic carbonates, 34% (TON, 680) under 1 atm air. It was drastically enhanced to 89% (TON, 1780) under pure CO 2 gas at 1 atm. It is the highest catalytic efficiency known for CO 2 fixation using nickel‐based catalysts at room temperature and 1 atm pressure. The electronic and steric factors of the ligands strongly influence the catalytic efficiency. Furthermore, all the catalysts can convert a wide range of epoxides (ten examples) into corresponding cyclic carbonate with excellent selectivity ( 〉 99%) under this mild condition.
Type of Medium:
Online Resource
ISSN:
1861-4728
,
1861-471X
DOI:
10.1002/asia.202201204
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2233006-9
Bookmarklink