Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids

Romero, F. D. et al. (2017) Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids. Nature Chemistry, 9(7), pp. 644-652. (doi:10.1038/nchem.2765)

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Abstract

Alkali metal intercalation into polyaromatic hydrocarbons (PAHs) has been studied intensely after reports of superconductivity in a number of potassium- and rubidium-intercalated materials. There are, however, no reported crystal structures to inform our understanding of the chemistry and physics because of the complex reactivity of PAHs with strong reducing agents at high temperature. Here we present the synthesis of crystalline K2Pentacene and K2Picene by a solid–solid insertion protocol that uses potassium hydride as a redox-controlled reducing agent to access the PAH dianions, and so enables the determination of their crystal structures. In both cases, the inserted cations expand the parent herringbone packings by reorienting the molecular anions to create multiple potassium sites within initially dense molecular layers, and thus interact with the PAH anion π systems. The synthetic and crystal chemistry of alkali metal intercalation into PAHs differs from that into fullerenes and graphite, in which the cation sites are pre-defined by the host structure.

Item Type:Articles
Additional Information:We acknowledge financial support from the UK Engineering and Physical Sciences Research Council (EP/K027255 and EP/K027212), the European Union/JST SICORP-LEMSUPER FP7-NMP-2011-EU-Japan project (contract no. NMP3-SL-2011- 283214), the Mitsubishi Foundation, the Japan Society for the Promotion of Science under the Scientific Research on Innovative Areas ‘J-Physics’ Project (no. 15H05882), the ‘World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials,’ the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Science and Technology Agency under the ERATO Isobe Degenerate π-Integration Project.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ganin, Dr Alexey
Authors: Romero, F. D., Pitcher, M.J., Hiley, C.I., Whitehead, G.F.S., Kar, S., Ganin, A.Y., Antypov, D., Collins, C., Dyer, M.S., Klupp, G., Colman, R.H., Prassides, K., and Rosseinsky, M.J.
Subjects:Q Science > QC Physics
Q Science > QD Chemistry
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Nature Chemistry
Publisher:Nature Publishing Group
ISSN:1755-4330
ISSN (Online):1755-4349
Published Online:24 April 2017
Copyright Holders:Copyright © 2017 Macmillan Publishers Limited, part of Springer Nature
First Published:First published in Nature Chemistry 9(7):644-652
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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