Structural variations in (001)-oriented layered lead halide perovskites templated by 1,2,4-triazolium
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.
Citation
Guo , Y-Y , Yang , L-J , McNulty , J A , Slawin , A M Z & Lightfoot , P 2020 , ' Structural variations in (001)-oriented layered lead halide perovskites templated by 1,2,4-triazolium ' , Dalton Transactions , vol. In press . https://doi.org/10.1039/D0DT02936J
Publication
Dalton Transactions
Status
Peer reviewed
ISSN
1477-9226Type
Journal article
Rights
Copyright © 2020 The Author(s). This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1039/D0DT02936J
Description
We acknowledge support from the University of St Andrews, the China Scholarship Council (studentship to YYG) and Leverhulme Trust (RPG-2018-065).Collections
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