Please use this identifier to cite or link to this item: https://doi.org/https://pubs.acs.org/doi/abs/10.1021/jacs.2c10859
Title: Aromaticity in Fully p-Conjugated Open-Cage Molecules
Authors: Yong Ni 
Yi Han 
Shan Xin
Xudong Hou 
Jun Zhu
Zhengtao Li 
Jishan Wu 
Issue Date: 7-Dec-2022
Citation: Yong Ni, Yi Han, Shan Xin, Xudong Hou, Jun Zhu, Zhengtao Li, Jishan Wu (2022-12-07). Aromaticity in Fully p-Conjugated Open-Cage Molecules 144 (50) : 23158–23167. ScholarBank@NUS Repository. https://doi.org/https://pubs.acs.org/doi/abs/10.1021/jacs.2c10859
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: Although aromaticity in 2D π-conjugated monocyclic and polycyclic molecules has been intensively studied, aromaticity in 3D fully π-conjugated molecular cages remains largely unexplored mainly due to the synthetic challenges. Herein, we report the facile synthesis of a π-conjugated molecular cage (1) containing four dimethylmethylene-bridged triphenylamine (DTPA) units via platinum-mediated assembly of four molecules of a pinacol borate trisubstituted DTPA derivative, followed by reductive elimination. 1 has an open-cage structure, consisting of two isomeric trimers in trans- and cis-configurations, and an additional macrocycle across four DTPA units. Accordingly, the trans- (2) and cis- (3) macrocyclic trimers were also synthesized for comparison. 1−3 can be facilely oxidized into their respective cations in which electrons are effectively delocalized at two or three dimensions. The detailed experimental measurements and theoretical calculations reveal that (1) the neutral cage 1 shows localized aromaticity in individual benzene rings; (2) the dication 12+·2SbF6 − displays bicyclic (anti)aromaticity with one macrocycle being aromatic (38π) and another macrocycle being antiaromatic (28π); on the other hand, the dications of the model compounds 2 and 3 are globally antiaromatic and nonaromatic, respectively; (3) the tetracation 14+·4SbF6 − exhibits dominant 2D Hückel antiaromaticity in one of the macrocycles (36π). In addition, 12+·2SbF6 −, 14+·4SbF6 −, and 22+·2SbF6 − possess open-shell singlet ground state with significant diradical character, while 32+·2SbF6 − adopts a triplet ground state to release strain.
URI: https://scholarbank.nus.edu.sg/handle/10635/249227
ISSN: 0002-7863
1520-5126
DOI: https://pubs.acs.org/doi/abs/10.1021/jacs.2c10859
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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