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Photoluminescence of LaIswitched on and off by association and dissociation of non-luminescent tetrahydrofuran

Dalton Transactions, ISSN: 1477-9234, Vol: 50, Issue: 11, Page: 3797-3800
2021
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Article Description

Although luminescent lanthanide-containing molecular complexes are well-known, it is not the case for Lawith no 4f or 5d electrons, and the few luminescent complexes of Lacontain luminescent ligands. Herein, we report an unexpected photoluminescence phenomenon of the LaI(THF)complex that was easily prepared by immersing commercial anhydrous LaIin THF. Strong blue emission was observed when LaI(THF)was subjected to UV irradiation at 254 nm, which contrasts the non-luminescence character of either LaIor THF. The absolute emission quantum yield was determined to be 50.5%. The observed luminescence of LaI(THF)results from metal-to-ligand charge transition (MLCT) which differs from the known charge transition types for lanthanum complexes according to DFT/TDDFT calculations. The photoluminescence of LaIcan be switched on and off by reversible THF association and dissociation. THF concentrations as low as 0.1 vol% inn-hexane and 0.5 vol% in the gas phase can be detected, indicating the capability of anhydrous LaIas a sensor for convenient and rapid THF detection.

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