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Benzidine/Quinoidal‐Benzidine‐Linked, Superbenzene‐Based π‐Conjugated Chiral Macrocycles and Cyclophanes
Author(s) -
Li Guangwu,
Matsuno Taisuke,
Han Yi,
Phan Hoa,
Wu Shaofei,
Jiang Qing,
Zou Ya,
Isobe Hiroyuki,
Wu Jishan
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202002447
Subject(s) - benzidine , chemistry , cyclophane , crystallography , cyclic voltammetry , conjugated system , intermolecular force , hexa , enantiomer , stereochemistry , photochemistry , crystal structure , molecule , electrochemistry , organic chemistry , electrode , polymer
Synthesis of fully conjugated cyclophanes containing large‐size polycyclic aromatics is challenging. Now, three benzidine‐linked, hexa‐peri‐hexabenzocoronene (superbenzene)‐based ortho‐, para‐, and meta‐cyclophanes are synthesized through intermolecular Yamamoto coupling reaction of structurally pre‐organized precursors. Subsequent oxidative dehydrogenation gave the corresponding quinoidal benzidine‐linked cyclophanes. Their geometries were confirmed by X‐ray crystallographic analysis and their electronic properties were investigated by electronic absorption, cyclic voltammetry, and DFT calculations. The quinoidal benzidine‐linked cyclophanes show thermally populated paramagnetic activity with a relatively large singlet‐triplet energy gap. Two enantiomers for the ortho‐cyclophanes ( 1‐NH and 1‐N ) were isolated and their chiral figure‐of‐eight macrocyclic structures were identified. The cage‐like cyclophanes 2‐NH and 3‐NH with concave surface can selectively encapsulate fullerene C 70 .