Vinylene-Linked 2D Conjugated Covalent Organic Frameworks by Wittig Reactions

Yannan Liu, Shuai Fu, Dominik L. Pastoetter, Arafat Hossain Khan, Yingying Zhang, Arezoo Dianat, Shunqi Xu, Zhongquan Liao, Marcus Richter, Minghao Yu, Miroslav Položij, Eike Brunner, Gianaurelio Cuniberti, Thomas Heine, Mischa Bonn, Hai I. Wang, Xinliang Feng

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Vinylene-linked two-dimensional covalent organic frameworks (V-2D-COFs) have shown great promise in electronics and optoelectronics. However, only a few reactions for V-2D-COFs have been developed hitherto. Besides the kinetically low reversibility of C=C bond formation, another underlying issue facing the synthesis of V-2D-COFs is the attainment of high (E)-alkene selectivity to ensure the appropriate symmetry of 2D frameworks. Here, we tailor the E/Z selectivity of the Wittig reaction by employing a proper catalyst (i.e., Cs2CO3) to obtain more stable intermediates and elevating the temperature across the reaction barrier. Subsequently, the Wittig reaction is innovatively utilized for the synthesis of four crystalline V-2D-COFs by combining aldehydes and ylides. Importantly, the efficient conjugation and decent crystallinity of the resultant V-2D-COFs are demonstrated by their high charge carrier mobilities over 10 cm2 V−1 s−1, as revealed by non-contact terahertz (THz) spectroscopy.

Original languageEnglish
Article numbere202209762
JournalAngewandte Chemie - International Edition
Volume61
Issue number49
DOIs
Publication statusPublished - 2022 Dec 5

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry

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