Structural variations in (001)-oriented layered lead halide perovskites templated by 1,2,4-triazolium
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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.
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
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DescriptionWe acknowledge support from the University of St Andrews, the China Scholarship Council (studentship to YYG) and Leverhulme Trust (RPG-2018-065).
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