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Capping N‐Donor Ligands Modulate the Magnetic Dynamics of DyIII β‐Diketonate Single‐Ion Magnets with D4d Symmetry
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2019-01-29 , DOI: 10.1002/chem.201805608
Peipei Cen 1, 2 , Xiangyu Liu 2, 3 , Jesús Ferrando‐Soria 2 , Yi‐Quan Zhang 4 , Gang Xie 1 , Sanping Chen 1 , Emilio Pardo 2
Affiliation  

A family of four mononuclear DyIII β‐diketonate complexes with formulas [Dy(tmhd)3(Br2‐bpy) (1), [Dy(tmhd)3(Br‐bpy)] (2), [Dy(tmhd)3(dppz)] (3), and [Dy(tmhd)3(mcdpq)] (4) (tmhd=2,2,6,6‐tetramethyl‐3,5‐heptanedione, Br2‐bpy=5,5′‐dibromo‐2,2′‐bipyridine, Br‐bpy=5‐bromo‐2,2′‐bipyridine, dppz=dipyrido [3,2‐a:2′,3′‐c]phenazine, mcdpq=2‐methoxyl‐3‐cyanodipyrido[3,2‐f:2,3′‐h]quinoxaline) were prepared by modifying the capping N‐donor coligands. DyIII centers in these complexes feature an N2O6 octacoordinate environment with distorted square‐antiprismatic D4d symmetry. Magnetic investigations evidenced single‐ion magnet behavior in all complexes with energy barriers Ueff of 42.10 (1), 61.47, (2), 77.53 (3), and 2.51 K (4) in the absence of static field, as well as 206.03 (1), 224.13 (2), 247.76 (3), and 49.70 K (4) under applied dc field (Hdc=1500 Oe for 1 and 2; Hdc=1200 Oe for 3 and 4). The different natures of the N‐donor ligands induce changes in both the coordination geometry and their intermolecular interactions, which severely impact their magnetic dynamics. The disparities in their magnetic behaviors and the uniaxial anisotropies are also explained and substantiated by theoretical calculations.

中文翻译:

带有帽盖的N配体配体以D4d对称性调制DyIIIβ-二酮酸酯单离子磁体的磁动力学。

4个单核的Dy的家族III β二酮络合物与式[镝(TMHD)3(BR 2 -bpy)(1),[镝(TMHD)3(BR联吡啶)](2),[镝(TMHD)3(dppz)](3)和[Dy(tmhd)3(mcdpq)](4)(tmhd = 2,2,6,6-四甲基-3,5-庚二酮,Br 2 - bpy = 5,5 '-dibromo-2,2'-联吡啶,Br-bpy = 5-bromo-2,2'-联吡啶,dppz = dipyrido [3,2- a:2',3'-c]吩嗪,mcdpq = 2-甲氧基3-氰基吡啶并[3,2- f:2,3'-h]喹喔啉是通过修饰N-供体大分子配体而制备的。镝III这些复合物中的中心具有N 2 O 6八坐标环境,具有方形反棱形D 4 d对称性。磁性研究表明,在没有静电场以及206.03的情况下,所有离子络合物的单离子磁体行为均具有能垒U eff为42.10(1),61.47,(2),77.53(3)和2.51 K(4)。 (1),224.13(2),247.76(3),和49.70 K(4)根据施加的DC场(ħ DC = 1500奥斯特为12 ; 对于34,H dc= 1200Oe 。N供体配体的不同性质会引起配位几何结构及其分子间相互作用的变化,从而严重影响其磁动力学。它们的磁行为和单轴各向异性的差异也得到了理论计算的解释和证实。
更新日期:2019-01-29
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