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A Self‐Assembled Homochiral Radical Cage with Paramagnetic Behaviors
Author(s) -
Jiao Tianyu,
Qu Hang,
Tong Lu,
Cao Xiaoyu,
Li Hao
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202100655
Subject(s) - homochirality , chemistry , cage , intramolecular force , radical , hydrogen bond , crystallography , enantiomer , yield (engineering) , amine gas treating , stereochemistry , molecule , organic chemistry , materials science , mathematics , combinatorics , metallurgy
Condensation of an inherently C 3 ‐symmetric polychlorotriphenylmethyl (PTM) radical trisaldehyde with tris(2‐aminoethyl)amine (TREN) yields a [4+4] tetrahedral radical cage as a racemic pair of homochiral enantiomers in 75 % isolated yield. The structure was characterized by X‐ray crystallography, confirming the homochirality of each cage framework. The homochirality results from intramolecular [CH⋅⋅⋅π] and hydrogen‐bonding interactions within the cage framework. The four PTM radicals in a cage undergo weak through‐space coupling. Magnetic measurements demonstrated that each cage bears 3.58 spins.