首页|Syntheses of new di-nuclear and tetra-nuclear lanthanide 9-anthracenecarboxylates:Magnetocaloric effect,slow magnetic relaxation and luminescent properties

Syntheses of new di-nuclear and tetra-nuclear lanthanide 9-anthracenecarboxylates:Magnetocaloric effect,slow magnetic relaxation and luminescent properties

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Lanthanide complex-based materials with magnetic and luminescent properties have received a great deal of attention,owing to their importantly potential applications in diverse fields.In this work,the 9-anthracenecarboxylic acid(9-Haca)as bridging ligand was applied in combination with optically activeπ-conjugated 2,4,6-tri(2-pyridyl)-1,3,5-triazine(tptz)to construct a series of new di-nuclear and tetra-nuclear lanthanide 9-anthracenecarboxylates[La2(9-aca)6(tptz)2(μ-H2O)]·0.25H2O(1),[Ln2(9-aca)6(tptz)2(H2O)2]·0.5AQ·CH3COOH2H2O[Ln=Sm(2a),Eu(2b),Gd(2c),Tb(2d),Dy(2e),Tm(2f);AQ=9,10-anthracenedione]and[Ln4(9-aca)10(tptz)2(CH3COO)2]·H2O[Ln=Eu(3a),Gd(3b),Dy(3c)].1 displays a di-nuclear centrosymmetric moiety[La2(9-aca)6(tptz)2(µ-H2O)]built up from two complex[La(9-aca)2(tptz)]groups bridged by one H2O molecule and two syn-syn-µ2-η1:η1-9-aca-bridging li-gands,while 2a-2f are isostructural and comprise another di-nuclear centrosymmetric moieties[Ln2(9-aca)6(tptz)2(H2O)2]based on two complex[Ln(9-aca)2(tptz)(H2O)]groups connected by two syn-syn-μ2-η1∶η1-9-aca-bridging ligands.3a-3c are isostructural and show tetra-nuclear centrosymmetric moieties[Ln4(9-aca)10(tptz)2(CH3COO)2]containing three types of coordination modes of 9-aca-ligands.The present compounds offer the only examples of lanthanide 9-anthracenecarboxylates decorated by optically active tptz.Magnetic investigations of 2a,2c-2f,and 3b-3c indicate that 3c is typical of slow relaxation of the magnetization,while 2c and 3b show significant magnetocaloric effect(MCE)with the value of-△Sm of 5.26 J/(kg·K)at 4 K and 15.65 J/(kg·K)at 2 K(△H=7 T),respectively.The luminescent properties were also studied and reveal that the characteristic luminescent properties of the π-conju-gated aromatic ligands are introduced into magnetic lanthanide 9-anthracenecarboxylates,simulta-neously exhibiting slow magnetic relaxation(or MCE)and luminescent properties.

Lanthanide complexesLuminescenceMagnetic propertiesMagnetocaloric effectSlow magnetic relaxationRare earths

Xing Liu、Ruonan Yang、Lu Zhang、Jian Zhou、Chunmei Huang、Huahong Zou、Zunhong Xiao

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Chongqing Key Laboratory of Inorganic Functional Materials,College of Chemistry,Chongqing Normal University,Chongqing,401331,China

Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources(Ministry of Education of China),School of Chemistry and Chemical Engineering of Guangxi Normal University,Guilin,541004,China

School of Chemistry and Materials,Guizhou Normal University,Guiyang,550025,China

国家自然科学基金Innovation and Entrepreneurship Team of Inorganic Optoelectronic Functional Materials for Chongqing YingcaiMajor Project of the Science and Technology Research Program of Chongqing Education Commission of ChinaInnovation Program for Chongqing's Overseas Returnees重庆市自然科学基金Chongqing Normal University

21671029cstc2021ycjhbgzxm0131KJZD-M202100501cx2019037cstc2021jcyjmsxmX038021XLB034

2024

10.1016/j.jre.2023.07.018

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(6)
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