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Qi Q, Burrezo PM, Phan H, et al. Ambient Stable Radical Cations, Diradicaloid π-Dimeric Dications, Closed-Shell Dications, and Diradical Dications of Methylthio-Capped Rylenes. Chemistry. 2017;23(31):7595-7606doi: 10.1002/chem.201701102.
Qi, Q., Burrezo, P. M., Phan, H., Herng, T. S., Gopalakrishna, T. Y., Zeng, W., Ding, J., Casado, J., & Wu, J. (2017). Ambient Stable Radical Cations, Diradicaloid π-Dimeric Dications, Closed-Shell Dications, and Diradical Dications of Methylthio-Capped Rylenes. Chemistry (Weinheim an der Bergstrasse, Germany), 23(31), 7595-7606. https://doi.org/10.1002/chem.201701102
Qi, Qingbiao, et al. "Ambient Stable Radical Cations, Diradicaloid π-Dimeric Dications, Closed-Shell Dications, and Diradical Dications of Methylthio-Capped Rylenes." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 23,31 (2017): 7595-7606. doi: https://doi.org/10.1002/chem.201701102
Qi Q, Burrezo PM, Phan H, Herng TS, Gopalakrishna TY, Zeng W, Ding J, Casado J, Wu J. Ambient Stable Radical Cations, Diradicaloid π-Dimeric Dications, Closed-Shell Dications, and Diradical Dications of Methylthio-Capped Rylenes. Chemistry. 2017 Jun 01;23(31):7595-7606. doi: 10.1002/chem.201701102. Epub 2017 May 17. PMID: 28382693.
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Chemistry. 2017 Jun 01;23(31):7595-7606. doi: 10.1002/chem.201701102. Epub 2017 May 17.

Ambient Stable Radical Cations, Diradicaloid π-Dimeric Dications, Closed-Shell Dications, and Diradical Dications of Methylthio-Capped Rylenes.

Chemistry (Weinheim an der Bergstrasse, Germany)

Qingbiao Qi, Paula Mayorga Burrezo, Hoa Phan, Tun Seng Herng, Tullimilli Y Gopalakrishna, Wangdong Zeng, Jun Ding, Juan Casado, Jishan Wu

Affiliations

  1. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
  2. Department of Physical Chemistry, University of Malaga, Campus de Teatinos s/n, 229071, Malaga, Spain.
  3. Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore.

PMID: 28382693 DOI: 10.1002/chem.201701102

Abstract

Radical cations and dications of π-conjugated systems play vital roles in organic electronic devices, organic conductors, and conducting polymers. Their structures, charge and spin distribution, and mechanism of charge transport are of great interest. In this article, radical cations and dications of a series of newly synthesized methylthio-capped rylenes were synthesized and isolated. Their ground-state structures, physical properties, and solid-state packing were systematically investigated by various experimental methods, such as X-ray crystallographic analysis, UV/Vis/NIR absorption spectroscopy, (spectro-)electrochemistry, nuclear magnetic resonance spectroscopy, electron spin resonance spectroscopy, superconducting quantum interference device, and Raman spectroscopy, assisted by DFT calculations. It was found that all the charged species show an exceptional stability under ambient air and light conditions due to the efficient spin and charge delocalization over the whole rylene backbone. The dication of hexarylene turned out to have an unusual open-shell singlet rather than closed-shell ground state, thus it can be described as a diradical dication. Dimerization was observed for the radical cations and even the dications in crystals due to the strong intermolecular antiferromagnetic spin-spin interaction and π-π interaction, which result in unique magnetic properties. Such intermolecular association was also observed in solution.

© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: annulation; dications; open-shell; radical ions; rylenes

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