In:
Frontiers in Chemistry, Frontiers Media SA, Vol. 10 ( 2022-12-7)
Abstract:
Visible-luminescent lanthanide (Ln L ) complexes with a highly planar tetradentate ligand were successfully developed for a visible-light solid-state excitation system. L was designed by using two 2-hydroxy-3-(2-pyridinyl)-benzaldehyde molecules bridged by ethylenediamine, which was then coordinated to a series of Ln ions (Ln = Nd, Sm, Eu, Gd, Tb, Dy, and Yb). From the measurement of single-crystal X-ray analysis of Eu L , two phenolic O atoms and two imine N atoms in L were coordinated to the Eu ion, and each π-electronic system took coplanar with the edged-pyridine moiety through an intramolecular hydrogen bond. The enol group on the phenolic skeleton changed to the keto form, and the pyridine was protonated. Thus, intramolecular proton transfer occurred in L after the complexation. Other complexes take isostructure. The space group is P -1, and the c -axis shrinks with decreasing temperature without a phase transition in Eu L . The yellow color caused by the planar structure of L can sensitize ff emission by visible light, and the luminescence color of each complex depends on central Ln ions. Furthermore, a phosphorescence band also appeared at rt with ff emission in Ln L . Drastic temperature dependence of luminescence was clarified quantitatively.
Type of Medium:
Online Resource
ISSN:
2296-2646
DOI:
10.3389/fchem.2022.1047960
DOI:
10.3389/fchem.2022.1047960.s001
DOI:
10.3389/fchem.2022.1047960.s002
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2022
detail.hit.zdb_id:
2711776-5
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