Mechanochromic Switching between Delayed Fluorescence and Phosphorescence of Luminescent Coordination Polymers Composed of Dinuclear Copper(I) Iodide Rhombic Cores

Chemistry : a European Journal
Atsushi KobayashiMasako Kato

Abstract

The synthesis and photophysical properties of two luminescent CuI coordination polymers, [Cu2 I2 (PPh3 )2 (3-tpyb)]n and [Cu2 I2 (PPh3 )2 (4-tpyb)]n (Cu-3-tpyb and Cu-4-tpyb; PPh3 =triphenylphosphine, m-tpyb=1,3,5-tris(m-pyridyl)benzene (m=3, 4)), are described. X-ray structural analysis indicated that one-dimensional coordination chains comprising rhombic {Cu2 I2 (PPh3 )2 } cores and m-tpyb bridging ligands were formed. Both Cu-3-tpyb and Cu-4-tpyb exhibited blue-to-yellow thermally activated delayed fluorescence (TADF) that originated from mixing of the metal-to-ligand and halide-to-ligand charge-transfer excited states and moderate emission quantum yields of 0.29 and 0.27, respectively, at 298 K. Further, mechanochromic luminescence was observed for both complexes. The emission lifetimes indicated that the origin of emission switched from TADF to phosphorescence, which was derived from the triplet cluster-centered (3 CC) emissive state generated by grinding-induced amorphization.

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Citations

Jan 23, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Antoine VacherMathieu Achard
Aug 29, 2019·Chemistry, an Asian Journal·Raquel Utrera-MeleroSandrine Perruchas
May 16, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Brendan HuitorelSandrine Perruchas
Nov 30, 2019·Chemical Communications : Chem Comm·Li-Dan LinShou-Tian Zheng
Nov 15, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Sae KondoMasako Kato
Mar 23, 2021·Angewandte Chemie·Andrey Y BaranovAlexander V Artem'ev
Aug 12, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Sandrine Perruchas
Mar 14, 2019·Inorganic Chemistry·Atsushi KobayashiMasako Kato
Dec 10, 2021·Chemistry : a European Journal·Fan Gu, Xiang Ma
Feb 2, 2022·Dalton Transactions : an International Journal of Inorganic Chemistry·Nikita A ShekhovtsovMark B Bushuev

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