Extending carbon chemistry at high-pressure by synthesis of CaC2 and Ca3C7 with deprotonated polyacene- and para-poly(indenoindene)-like nanoribbons

Saiana Khandarkhaeva, Timofey Fedotenko, Alena Aslandukova, Fariia Iasmin Akbar, Maxim Bykov, Dominique Laniel, Andrey Aslandukov, Uwe Ruschewitz, Christian Tobeck, Björn Winkler, Stella Chariton, Vitali Prakapenka, Konstantin Glazyrin, Carlotta Giacobbe, Eleanor Lawrence Bright, Maxim Belov, Natalia Dubrovinskaia and Leonid Dubrovinsky ()
Additional contact information
Saiana Khandarkhaeva: Universitätstraβe 30
Timofey Fedotenko: Deutsches Elektronen-Synchrotron DESY
Alena Aslandukova: Universitätstraβe 30
Fariia Iasmin Akbar: Universitätstraβe 30
Maxim Bykov: University of Cologne
Dominique Laniel: Universitätstraβe 30
Andrey Aslandukov: Universitätstraβe 30
Uwe Ruschewitz: University of Cologne
Christian Tobeck: University of Cologne
Björn Winkler: Goethe University Frankfurt
Stella Chariton: The University of Chicago
Vitali Prakapenka: The University of Chicago
Konstantin Glazyrin: Deutsches Elektronen-Synchrotron DESY
Carlotta Giacobbe: European Synchrotron Radiation Facility
Eleanor Lawrence Bright: European Synchrotron Radiation Facility
Maxim Belov: Linköping University
Natalia Dubrovinskaia: Universitätstraβe 30
Leonid Dubrovinsky: Universitätstraβe 30

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Metal carbides are known to contain small carbon units similar to those found in the molecules of methane, acetylene, and allene. However, for numerous binary systems ab initio calculations predict the formation of unusual metal carbides with exotic polycarbon units, [C6] rings, and graphitic carbon sheets at high pressure (HP). Here we report the synthesis and structural characterization of a HP-CaC2 polymorph and a Ca3C7 compound featuring deprotonated polyacene-like and para-poly(indenoindene)-like nanoribbons, respectively. We also demonstrate that carbides with infinite chains of fused [C6] rings can exist even at conditions of deep planetary interiors ( ~ 140 GPa and ~3300 K). Hydrolysis of high-pressure carbides may provide a possible abiotic route to polycyclic aromatic hydrocarbons in Universe.

Date: 2024
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DOI: 10.1038/s41467-024-47138-2

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