Diacetylenes with Ionic-Liquid-Like Substituents: Associating a Polymerizing Cation with a Polymerizing Anion in a Single Precursor for the Synthesis of N-Doped Carbon Materials

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TitreDiacetylenes with Ionic-Liquid-Like Substituents: Associating a Polymerizing Cation with a Polymerizing Anion in a Single Precursor for the Synthesis of N-Doped Carbon Materials
Type de publicationJournal Article
Year of Publication2016
AuteursFahsi K, Dumail X, Dutremez SG, van der Lee A, Vioux A, Viau L
JournalCHEMISTRY-A EUROPEAN JOURNAL
Volume22
Pagination1682-1695
Date PublishedJAN 26
Type of ArticleArticle
ISSN0947-6539
Mots-clésalkynes, azolium compounds, Carbon, Cyanides, Nitrogen Doping
Résumé

Imidazolium- and benzimidazolium-substituted diacetylenes with bromide or nitrogen-rich dicyanamide and tricyanomethanide anions were synthesized and used as precursors for the preparation of N-doped carbon materials. On pyrolysis under argon at 800 degrees C both halide precursors afforded graphite-like structures with nitrogen contents of about 8.5 %. When the dicyanamide and tricyanomethanide precursors were thermolyzed at the same temperature, graphite-like structures were obtained that exhibit nitrogen contents in the range 17-20 wt%; thereby, the benefit of associating a polymerizing cation with a polymerizing anion in a single precursor was demonstrated. On pyrolysis at 1100 degrees C the nitrogen contents of the latter pyrolysates remain high (ca. 6 wt%). Adsorption measurements with krypton at 77 K indicated that the materials are nonporous. The highest electrical conductivity was observed for a pyrolysate with one of the lowest nitrogen contents, which also has the highest degree of graphitization. Thus, the quest for N-rich carbons with high electrical conductivities should include both maximization of the nitrogen content and optimization of the degree of graphitization. Crystallographic investigation of the precursors and spectroscopic characterization of the pyrolysates prepared by heating at 220 degrees C indicate that construction of the final carbon framework does not involve the intermediate formation of a polydiacetylene.

DOI10.1002/chem.201502181