Stepwise Increase of Nd III ‐Based Phosphorescence by AIE‐Active Sensitizer: Broadening the AIPE Family from Transition Metals to Discrete Near‐Infrared Lanthanide Complexes**
| Autor: | Jia-Cun He, Dao-Bin Guan, Hao Zhuo, Hai-Bing Xu, Ming-Hua Zeng |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Chemistry – A European Journal. 27:16204-16211 |
| ISSN: | 1521-3765 0947-6539 |
| Popis: | We designed two near-infrared (NIR) lanthanide complexes [(L)2 -Nd(NO3 )3 ] (L=TPE2 -BPY for 1, TPE-BPY for 2) by employing aggregation-induced emission (AIE)-active tetraphenylethylene (TPE) derivatives as sensitizers, which possessed matched energy to NdIII , prevented competitive deactivation under aggregation, even shifted the excitation window toward 600 nm by twisted intramolecular charge transfer. Furthermore, benefiting from the 4 f electron shielding effect and antenna effect, the enhanced excitation energies of the AIE-active sensitizers by structural rigidification transferred into the inert NdIII excited state through 3 LMCT, affording the first aggregation-induced phosphorescence enhancement (AIPE)-active discrete NIR-emitting lanthanide complexes. As 1 equipped with more AIE-active TPE than 2, L→Nd energy transfer efficiency in the former was higher than that in the latter under the same conditions. Consequently, the crystal of 1 exhibited one of the longest lifetimes (9.69 μs) among NdIII -based complexes containing C-H bonds. |
| Databáze: | OpenAIRE |
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