首页|Slow magnetic relaxation and photoluminescence behaviors of dilanthanide complexes bearing N8O2 donor macrocyclic ligand

Slow magnetic relaxation and photoluminescence behaviors of dilanthanide complexes bearing N8O2 donor macrocyclic ligand

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On account of the complicated magnetic exchange interactions between lanthanide ions,binuclear lanthanide complexes have broad application prospect in the field of single-molecule magnets.There-fore,it is necessary to develop reasonable bridging ligands to manipulate the directional assembly of binuclear lanthanide complexes.Herein,we selected the macrocyclic ligand LN8O2 to build up two new dilanthanide complexes[Ln2(LN8O2)(OpyO)2(H2O)2](NO3)2(1-Ln,Ln=Dy,Tb;LN8O2=hexamethyl-tet-raaza-dioxe-dipyrazolacycloicosaphane-2,9,12,19-tetraene;OpyOH=2-pyridinol-1-oxide).Dynamic magnetic studies show that 1-Dy exhibits slow relaxation behavior under a 1 kOe applied field.Further fitting analysis of relaxation times gives the effective energy barrier of 38.2 cm-1,and reveals that the slow magnetic relaxation behavior is dominated by the Orbach and Raman processes.High-resolution luminescence emission spectrum indicates the energy gap of 36.8 cm-1 between the ground state and the first excited state,consistent with the magnetic measurement results.1-Tb exhibits brilliant char-acteristic green light emission under UV light excitation.The absolute quantum yield of 1-Tb is 44.8％,and its first-order fitted decay lifetime is 779.21 μs at room temperature.This study provides the way for directional construction of high-performance molecular materials with magnetic and optical dual-function.

Dilanthanide complexesSingle-molecule magnetsMacrocyclic ligandPhotoluminescence behaviorRare earths

Pei-Yu Liao、Yu-Quan Qi、Zhen Li、Jian-Hua Jia、Ming-Liang Tong

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Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education,School of Chemistry,Sun Yat-Sen University,Guangzhou 510006,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaPearl River Talent Plan of Guangdong

2213101122071274218210032017BT01C161

2024

10.1016/j.jre.2023.04.017

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(7)