Guanidinium and Mixed Cesium-Guanidinium Tin(II) Bromides: Effects of Quantum Confinement and Out-of-Plane Octahedral Tilting.

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2019
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Abstract
Hybrid organic-inorganic main-group metal halide compounds are the subject of intense research owing to their unique optoelectronic characteristics. In this work, we report the synthesis, structure, and electronic and optical properties of a family of hybrid tin (II) bromide compounds comprising guanidinium [G, C(NH)] and mixed cesium-guanidinium cations: GSnBr, CsGSnBr, and CsGSnBr. GSnBr has a one-dimensional structure that consists of chains of corner-sharing [SnBr] square pyramids and G cations situated in between the chains. Cs exhibits a pronounced structure-directing effect where a mixture of Cs and G cations forms mono- and bilayered two-dimensional perovskites: CsGSnBr and CsGSnBr. Furthermore, the flat shapes of the guanidinium cations induce anisotropic out-of-plane tilts of the [SnBr] octahedra in the CsGSnBr and CsGSnBr compounds. In GSnBr, the Sn lone pair is highly stereoactive and favors non-octahedral, that is, square pyramidal coordination of Sn(II). GSnBr exhibits bright broad-band emission from self-trapped excitonic states, owing to its soft lattice and electronic localization. This emission in GSnBr is characterized by a photoluminescence (PL) quantum yield of 2% at room temperature (RT; 75 ± 5% at 77 K) and a fast PL lifetime of 18 ns at room temperature.
Reference Key
nazarenko2019guanidiniumchemistry Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Nazarenko, Olga;Kotyrba, Martin R;Yakunin, Sergii;Wörle, Michael;Benin, Bogdan M;Rainò, Gabriele;Krumeich, Frank;Kepenekian, Mikaël;Even, Jacky;Katan, Claudine;Kovalenko, Maksym V;
Journal chemistry of materials : a publication of the american chemical society
Year 2019
DOI
10.1021/acs.chemmater.9b00038
URL
Keywords
Escherichia coli af1214 dimethylallyl phosphate fmn fmn prenyltransferase ubix fdc1 polyphosphate prenol kinase prenylated fmn reversible decarboxylase ubid

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