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Modulating the Magnetic Interaction in New Triple-Decker Dysprosium(III) Single-Molecule Magnets
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-01-09 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02824
Jing-Yuan Ge 1, 2 , Hai-Ying Wang 1 , Jian Su 1 , Jing Li 1 , Bao-Lin Wang 3 , Yi-Quan Zhang 3 , Jing-Lin Zuo 1
Affiliation  

A new type of dinuclear dysprosium(III) complex based on phthalocyanine and salicylaldehyde derivatives (HL-R), [Dy2(Pc)2(L-R)2(H2O)]·2THF (R = OCH3 (1), OC2H5 (2); H2Pc = phthalocyanine; HL-OCH3 = 2-hydroxy-3-methoxybenzaldehyde; HL-OC2H5 = 3-ethoxy-2-hydroxybenzaldehyde), was successfully synthesized and structurally characterized. Complex 1 features a sandwich-type triple-decker structure, where two coplanar L-OCH3 ligands lie in the middle layer shared by two eight-coordinated DyIII ions and two Pc ligands are located in the outer layer. In 2, the introduction of an ethoxy group generates a noncoordination mode for the Oalkoxy atom. Magnetic studies indicate that complex 1 behaves as a zero-field single-molecule magnet with a higher energy barrier, while 2 exhibits a fast tunneling relaxation process. Theoretical calculations revealed that changes in the ligand field environment around DyIII ions can significantly affect the arrangement of the main magnetic axes and further result in distinct magnetic interactions as well as different relaxation behaviors.

中文翻译:

新型三层Dy(III)单分子磁体中的磁相互作用的调制

一种新型的基于酞菁和水杨醛衍生物(HL-R)[Dy 2(Pc)2(LR)2(H 2 O)]·2THF(R = OCH 31),已成功合成了OC 2 H 52); H 2 Pc =酞菁; HL-OCH 3 = 2-羟基-3-甲氧基苯甲醛; HL-OC 2 H 5 = 3-乙氧基-2-羟基苯甲醛)。配合物1具有三明治式三层结构,其中两个共面L-OCH 3配体位于由两个八个八配位的Dy III离子共享的中间层中,两个Pc配体位于外层中。在图2中,乙氧基的引入产生了O烷氧基原子的非配位模式。磁性研究表明,复合物1表现为具有较高能垒的零场单分子磁体,而复合物2则表现出快速的隧穿弛豫过程。理论计算表明,Dy III离子周围配体场环境的变化会显着影响主磁轴的排列,并进一步导致明显的磁相互作用以及不同的弛豫行为。
更新日期:2018-01-09
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