Issue 8, 2020

First aggregation-induced emission of a Tb(iii) luminophore based on modulation of ligand–ligand charge transfer bands

Abstract

Herein the aggregation-induced emission (AIE) of a Tb(III) complex is reported for the first time. The Tb(III) complex is composed of three anionic ligands (acac: acetylacetonate) and one large hetero-π-conjugated neutral ligand (dpq: dipyrido[3,2-f:2′,3′-h]quinoxaline). The formation of a crystalline J-aggregate of the Tb(III) complex (CJ-Tb(III)) was characterized by X-ray crystal structure analysis and absorption spectra. A crystalline H-aggregate (CH-Tb(III)) was also prepared using the ligand steric effect (tmh: 2,2,6,6-tetramethyl-3,5-heptanedionate). The emission and AIE properties of CJ-Tb(III) were evaluated using emission spectra, lifetime, and quantum yields, whereas CH-Tb(III) did not emit photons. Density functional theory calculations predict that the AIE originates from the modulation of ligand-to-ligand charge transfer bands through J-aggregation.

Graphical abstract: First aggregation-induced emission of a Tb(iii) luminophore based on modulation of ligand–ligand charge transfer bands

Supplementary files

Article information

Article type
Paper
Submitted
09 jan 2020
Accepted
22 jan 2020
First published
28 jan 2020

Dalton Trans., 2020,49, 2431-2436

First aggregation-induced emission of a Tb(III) luminophore based on modulation of ligand–ligand charge transfer bands

Y. Kitagawa, M. Kumagai, T. Nakanishi, K. Fushimi and Y. Hasegawa, Dalton Trans., 2020, 49, 2431 DOI: 10.1039/D0DT00094A

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