The assembly of the three-dimensional(3D) lanthanide complexes,aiming at obtaining large magnetocalo ric effects,encounte rs a substantial challenge.In this study,we successfully isolated a novel series of Lnexclusive...The assembly of the three-dimensional(3D) lanthanide complexes,aiming at obtaining large magnetocalo ric effects,encounte rs a substantial challenge.In this study,we successfully isolated a novel series of Lnexclusive 3D complexes,fo rmulated as {[Ln_(2)(EDTA)(C_(2)O_(4))(H_(2)O)_(2)]}n(abbreviated as Ln_(2),Ln=Gd^(Ⅲ)(1),Eu^(Ⅲ)(2),Sm^(Ⅲ)(3),H_(4)EDTA=ethylene diamine tetraacetic acid;H_(2)C_(2)O_(4)=oxalic acid).Crystallographic study exhibits that complex 1 features a cute snail-shaped Gd_(2) unit.Adjacent Gd_(2) units are aggregated by hexadentate EDTA^(4-) and C_(2)O_(4)^(2-)ligands,further constructing a charming three-dimensional metal-organic framework with interesting parallelogram-shaped layers.Notably,all coordinated EDTA^(4-)ligands and lightweight C_(2)O_(4)^(2-)groups contribute to building a densely packed metal-organic framework,endowing complex 1 with remarkable magnetocaloric effect(-ΔS_(m)^(max)=42.5 J/(kg·K) at 2.5 K and ΔH=7.0 T).Additionally,complexes 2 and 3 exhibit outstanding solid-state luminescent properties with lifetimes of43 8.22 and 4.13 μs,and quantum yields(QY) of 7.03% and 15.46%,respectively.展开更多
基金Project supported by the National Natural Science Foundation of China (92161109)the Postgraduate Research&Practice Innovation Program of Jiangsu Province (KYCX24_1566)。
文摘The assembly of the three-dimensional(3D) lanthanide complexes,aiming at obtaining large magnetocalo ric effects,encounte rs a substantial challenge.In this study,we successfully isolated a novel series of Lnexclusive 3D complexes,fo rmulated as {[Ln_(2)(EDTA)(C_(2)O_(4))(H_(2)O)_(2)]}n(abbreviated as Ln_(2),Ln=Gd^(Ⅲ)(1),Eu^(Ⅲ)(2),Sm^(Ⅲ)(3),H_(4)EDTA=ethylene diamine tetraacetic acid;H_(2)C_(2)O_(4)=oxalic acid).Crystallographic study exhibits that complex 1 features a cute snail-shaped Gd_(2) unit.Adjacent Gd_(2) units are aggregated by hexadentate EDTA^(4-) and C_(2)O_(4)^(2-)ligands,further constructing a charming three-dimensional metal-organic framework with interesting parallelogram-shaped layers.Notably,all coordinated EDTA^(4-)ligands and lightweight C_(2)O_(4)^(2-)groups contribute to building a densely packed metal-organic framework,endowing complex 1 with remarkable magnetocaloric effect(-ΔS_(m)^(max)=42.5 J/(kg·K) at 2.5 K and ΔH=7.0 T).Additionally,complexes 2 and 3 exhibit outstanding solid-state luminescent properties with lifetimes of43 8.22 and 4.13 μs,and quantum yields(QY) of 7.03% and 15.46%,respectively.
