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I11-High Resolution Powder Diffraction	Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids Fabio Denis Romero , Michael Pitcher , Craig Hiley , George Whitehead , Srotoswini Kar , Alexey Ganin , Dmitro Antypov , Christopher Collins , Matthew Dyer , Gyongyi Klupp , Ross Colman , Kosmas Prassides , Matthew Rosseinsky Nature Chemistry DOI: 10.1038/nchem.2765 Diamond Proposal Number(s): [9282, 12336] Show Abstract ▼ 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.	Apr 2017

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I11-High Resolution Powder Diffraction

Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids