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Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids

DOI: 10.1038/nchem.2765 DOI Help

Authors: Fabio Denis Romero (University of Liverpool) , Michael Pitcher (University of Oxford) , Craig Hiley (University of Warwick) , George Whitehead (University of Liverpool) , Srotoswini Kar , Alexey Ganin (University of Liverpool) , Dmitro Antypov (University of Liverpool) , Christopher Collins (University of Liverpool) , Matthew Dyer (University of Liverpool) , Gyongyi Klupp , Ross Colman , Kosmas Prassides , Matthew Rosseinsky (University of Liverpool)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Chemistry

State: Published (Approved)
Published: April 2017
Diamond Proposal Number(s): 9282 , 12336

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.

Journal Keywords: Solid-state chemistry; Superconductors

Subject Areas: Chemistry, Materials, Physics

Instruments: I11-High Resolution Powder Diffraction

Added On: 24/03/2017 12:34

Discipline Tags:

Superconductors Quantum Materials Physics Physical Chemistry Hard condensed matter - structures Chemistry Materials Science Organic Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction