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.
Original language | English |
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Journal | Dalton Transactions |
Volume | In press |
Early online date | 10 Nov 2020 |
DOIs | |
Publication status | E-pub ahead of print - 10 Nov 2020 |
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Structural Variations in (001)-Oriented Layered Lead Halide Perovskites, Templated by 1,2,4-Triazolium (dataset)
Guo, Y. (Creator), Yang, L. (Creator), McNulty, J. A. (Creator), Slawin, A. M. Z. (Creator) & Lightfoot, P. (Creator), University of St Andrews, 12 Nov 2020
DOI: 10.17630/8ec43b91-782a-4c56-9501-eb7a700e1e48
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