Solving the Hydrogen and Lithium Substructure of Poly(triazine imide)/LiCl Using NMR Crystallography

verfasst von

Maria B. Mesch, Kilian Bärwinkel, Yaşar Krysiak, Charlotte Martineau, Francis Taulelle, Reinhard B. Neder, Ute Kolb, Jürgen Senker

Abstract

Poly(triazine imide) with incorporated lithium chloride has recently attracted substantial attention due to its photocatalytic activity for water splitting. However, an apparent H/Li disorder prevents the delineation of structure–property relationships, for example, with respect to band-gap tuning. Herein, we show that through a combination of one- and two-dimensional, multinuclear solid-state NMR spectroscopy, chemical modelling, automated electron diffraction tomography, and an analysis based on X-ray pair distribution functions, it is finally possible to resolve the H/Li substructure. In each cavity, one hydrogen atom is bound to a bridging nitrogen atom, while a second one protonates a triazine ring. The two lithium ions within each cavity are positioned between two nitrogen atoms of neighbouring triazine rings. The thereby induced local dipole moments cause slight buckling of the framework and lateral displacements of the Cl⁻ions at a coherence length below 2 nm. Nevertheless, the average structure conforms to space group P2₁2₁2₁. In this way, we demonstrate that, in particular, the above-mentioned techniques allow for smart interplay in delineating the real structure of PTI/LiCl.

Externe Organisation(en)

Universität Bayreuth
Johannes Gutenberg-Universität Mainz
Universite de Versailles
Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU Erlangen-Nürnberg)

Typ

Artikel

Journal

Chemistry - a European journal

Band

22

Seiten

16878-16890

Anzahl der Seiten

13

ISSN

0947-6539

Publikationsdatum

08.11.2016

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Katalyse, Organische Chemie

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1002/chem.201603726 (Zugang: Geschlossen)