Abstract
Aluminum hydrides are versatile compounds utilized as reducing agents, precursors of aluminum complexes, and as catalysts for polymerization reactions. However, their photophysical properties have been overlooked, although several luminescent aluminum complexes have been utilized conventionally for emitting layers in modern light-emitting devices. Herein, we report the synthesis and photophysical properties of a luminescent β-diketiminate dihydride complex through the reaction between lithium aluminum hydride and the corresponding ligand. The obtained compound exhibits crystallization-induced emission (CIE) properties at room temperature and long-lifetime phosphorescence at 80 K. Our experimental and theoretical investigations suggest that low-energy molecular vibration could play an important role in the realization of the CIE property.
Highlights
Organic and inorganic aluminum complexes have attracted a tremendous amount of attention as a catalyst for organic and polymerization reactions, and as a luminescent material, owing to their specific reactivities, the abundance of aluminum in the earth’s crust, and their low environmental burden
LAlH was prepared by the reaction of the β-diketiminate ligand [42] and an excess amount of lithium aluminum hydride in toluene at 90 ◦ C (Scheme 1)
Compound LAlH was fully characterized by 1 H, 13 C{1 H} and 27 Al{1 H} NMR spectroscopy and high-resolution mass spectrometry with the direct analysis in real time (DART) (Direct Analysis in Real-Time) method
Summary
Organic and inorganic aluminum complexes have attracted a tremendous amount of attention as a catalyst for organic and polymerization reactions, and as a luminescent material, owing to their specific reactivities, the abundance of aluminum in the earth’s crust, and their low environmental burden. Aluminum hydrides have been one of the most important reducing agents in organic chemistry, and some of the most important precursors of various types of complexes since Schlesinger et al synthesized lithium aluminum hydride in 1947 [1,2]. A group of luminescent aluminum complexes has shed new light on the chemistry and physics of organic light-emitting diodes (OLEDs) since tris(8-quinolinolato) aluminum (Alq3 ) was applied to an emitting layer of light-emitting diodes [3,4,5]. The disappearance of the luminescence of the molecules is caused by intermolecular interaction in the condensed state
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