Novel 3D Cubic Topology in Hybrid Lead Halides with a Symmetric Aromatic Triammonium Exhibiting Water Stability
Résumé
The limitations of 3D perovskites are related to their narrow structural tunability of the organiccations and their moisture sensitivity. Herein, we report the new family of 3D cubic hybrid metal halides (T-Et6)3Pb11X31 (X=I, Br), where T is 1,3,5-tris-(4-aminophenyl)benzene. The materials are synthesized through an in-situ N-alkylation of T and an efficient one-step solvothermal reaction containing ethanol, initiating a tunable synthetic avenue for the acquisition of structurally complex hybrid halides with luminophores. (T-Et6)3Pb11X31 consists of an unprecedented Ia3 framework of [Pb11X31]9- 1D chains embedded with (T-Et6)3+ cations affording an overall 3D topology. The constituent [Pb11X31]9- chains include exclusively octahedral lead halide units with clusters of face- and edge-sharing connectivity, giving rise to weak broad emission centered at ~660 nm observed at 78K. (T-Et6)3Pb11I31 demonstrates water stability for at least 7 days. Synthesis through ambient-pressure results in tunable structural variations of 0D structures rendering T7Pb3Br27.DMF and T2Sn3Br18.4H2O.0.5Br2, both of which feature blue PL emission at room temperature.
Domaines
Chimie
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vasileiadou-2023-chem_mater-triammonium-main.pdf (3.15 Mo)
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vasileiadou-2023-chem_mater-triammonium-si.pdf (2.16 Mo)
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