In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), Vol. 9, No. 18 ( 2022), p. 4794-4800
Abstract:
Eu( ii ) complexes have been widely investigated in organic light-emitting diodes (OLEDs), magnetic resonance imaging and photoredox catalysis due to their unique photophysical and electrochemical properties. To favor their further applications, it is of necessity to find a simple way to systematically regulate their emission colors and redox potentials. Herein, we have designed and synthesized a series of Eu( ii )-containing cryptates EuX 2 -N 2 O 6 (N 2 O 6 = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane, X = Br or I, similarly hereinafter), EuX 2 -N 4 O 4 (N 4 O 4 = 4,7,13,16-tetraoxa-1,10,21,24-tetraazabicyclo[8.8.8]hexacosane), and EuX 2 -N 6 O 2 (N 6 O 2 = 4,7-dioxa-1,10,13,16,21,24-hexaazabicyclo[8.8.8]hexacosane), and studied their structures and properties systematically. These Eu( ii ) complexes exhibit tunable emission colors with maximum emission wavelengths in the range of 415–549 nm and photoluminescence quantum yields (PLQYs) in the range of 18–73%. On changing the N/O ratio of the cryptands, the emission colors, excited-state lifetimes, and redox potential of the corresponding Eu( ii ) complexes changed linearly. The results provide a clear basis for the design of tunable, luminescent Eu( ii ) complexes.
Type of Medium:
Online Resource
ISSN:
2052-1553
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
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