Issue 47, 2020
From the journal:

Dalton Transactions

Structural variations in (001)-oriented layered lead halide perovskites, templated by 1,2,4-triazolium†

Yuan-Yuan Guo, ORCID logo a   Lin-Jie Yang, ORCID logo a   Jason A. McNulty, ORCID logo a   Alexandra M. Z. Slawin ORCID logo a  and  Philip Lightfoot ORCID logo *a  

* Corresponding authors

a School of Chemistry and EaStChem, University of St Andrews, St Andrews, UK
E-mail: pl@st-andrews.ac.uk

Abstract

A new hybrid lead(II) halide perovskite, (TzH)2PbCl4, ([TzH+] = 1,2,4-triazolium), adopts a (001)-oriented layered perovskite structure, which can be considered as derived from the n = 1 Ruddlesden–Popper (RP) type. Variable temperature single crystal X-ray diffraction reveals a structural phase transition in the region 125 K < T < 173 K between a high temperature, high symmetry polymorph, space group Cmcm, and a low temperature, low symmetry chiral polymorph, space group P212121, which has a tripled unit cell volume. UV-Vis spectra suggest a band gap of 3.30 eV for (TzH)2PbCl4. A second polymorph of the bromide analogue, (TzH)2PbBr4-II, is also reported, and structural relationships between all three variants are discussed.

Graphical abstract: Structural variations in (001)-oriented layered lead halide perovskites, templated by 1,2,4-triazolium

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Article information

DOI
https://doi.org/10.1039/D0DT02936J
Article type
Paper
Submitted
21 Aug 2020
Accepted
10 Nov 2020
First published
10 Nov 2020

Dalton Trans., 2020,49, 17274-17280

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Structural variations in (001)-oriented layered lead halide perovskites, templated by 1,2,4-triazolium

Y. Guo, L. Yang, J. A. McNulty, A. M. Z. Slawin and P. Lightfoot, Dalton Trans., 2020, 49, 17274 DOI: 10.1039/D0DT02936J

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