Tuning of gallery heights in a crystalline 2D carbon nitride network



Chong, Samantha Y, Jones, James TA, Khimyak, Yaroslav Z, Cooper, Andrew I, Thomas, Arne, Antonietti, Markus and Bojdys, Michael J
(2013) Tuning of gallery heights in a crystalline 2D carbon nitride network. JOURNAL OF MATERIALS CHEMISTRY A, 1 (4). pp. 1102-1107.

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Abstract

Poly(triazine imide) - a 2D layered network - can be obtained as an intercalation compound with halides from the ionothermal condensation of dicyandiamide in a eutectic salt melt. The gallery height of the intercalated material can be tuned via the composition of the eutectic melt and by post-synthetic modification. Here, we report the synthesis of poly(triazine imide) with intercalated bromide ions (PTI/Br) from a lithium bromide and potassium bromide salt melt. PTI/Br has a hexagonal unit-cell (P63cm (no. 185); a = 8.500390(68) Å, c = 7.04483(17) Å) that contains two layers of imide-bridged triazine (C3N3) units stacked in an AB-fashion as corroborated by solid-state NMR, FTIR spectroscopy and high-resolution TEM. By comparison with a recently reported material PTI/Li +Cl-, prepared from a LiCl/KCl eutectic, the layer-stacking distance in the analogous bromide material was expanded from 3.38 Å to 3.52 Å-an exceptionally large spacing for an aromatic, discotic system (cf. graphite 3.35 Å). Subsequent treatment of PTI/Br with concentrated ammonium fluoride yields poly(triazine imide) with intercalated fluoride ions (PTI/F) (P63/m (no. 176); a = 8.4212(4) Å, c = 6.6381(5) Å) as a statistical phase mix with PTI/Br. Fluoride intercalation leads to a contraction of the gallery height to 3.32 Å, demonstrating that the gallery height is synthetically tuneable in these materials. © The Royal Society of Chemistry 2013.

Item Type: Article
Additional Information: ## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords: 40 Engineering, 3403 Macromolecular and Materials Chemistry, 4016 Materials Engineering, 34 Chemical Sciences
Depositing User: Symplectic Admin
Date Deposited: 18 Feb 2015 11:10
Last Modified: 20 Jun 2024 23:13
DOI: 10.1039/c2ta01068b
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/2007108