open access

https://hdl.handle.net/2115/75620

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

英語

Phosphorescence

2018-10-01

Wiley-Blackwell

Chemistry-A European journal

24(55)

14750-14759

The synthesis and photophysical properties of two luminescent Cu-I coordination polymers, [Cu2I2(PPh3)(2)(3-tpyb)](n) and [Cu2I2(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 {Cu2I2(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 298K. 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 ((CC)-C-3) emissive state generated by grinding-induced amorphization.

学術雑誌論文

Accepted Manuscript

This is the peer-reviewed version of the following article: Chemistry-A European journal, Volume24, Issue55, October 1, 2018, Pages 14750-14759, which has been published in final form at https://doi.org/10.1002/chem.201802532 . This article may be used for non-commercial purposes in accordance with Wiley-VCH Terms and Conditions for Self-Archiving.

0947-6539