Cu
<sup>II</sup>
Gd
<sup>III</sup>
Cryogenic Magnetic Refrigerants and Cu
<sub>8</sub>
Dy
<sub>9</sub>
Single‐Molecule Magnet Generated by In Situ Reactions of Picolinaldehyde and Acetylpyridine: Experimental and Theoretical Study
A series of heterometallic [LnIIIxCuIIy] complexes, [Gd2Cu2]n (1), [Gd4Cu8] (2), [Ln9Cu8] (Ln=Gd, 3⋅Gd; Ln=Dy, 3⋅Dy), were successfully synthesized by a one‐pot route at room temperature with three kinds of in situ carbonyl‐related reactions: Cannizzaro reaction, aldol reaction, and oxidation. This strategy led to dysprosium analogues that behaved as single‐molecule magnets (SMMs) and gadolinium analogues
一系列杂金属[Ln III x Cu II y ]配合物,[Gd 2 Cu 2 ] n(1),[Gd 4 Cu 8 ](2),[Ln 9 Cu 8 ](Ln = Gd,3⋅Gd ; Ln = Dy,3⋅Dy),是在室温下通过一锅法成功地合成了三种与羰基相关的原位反应:Cannizzaro反应,羟醛反应和氧化反应。这种策略导致类似物表现为单分子磁体(SMM),而lin类似物表现出显着的磁热效应(MCE)。在这项研究中,提出了一种数值DFT方法,该方法利用伪势来计算三种多核[Gd x Cu y ]配合物中的交换耦合常数。利用这些值,已经执行了精确的对角化或量子蒙特卡洛模拟,以计算MCE中涉及的磁熵的变化。对于[Dy 9 Cu 8 ]配合物,Dy的局部磁性III中心已通过使用CASSCF + RASSI方法确定。
Structure and magnetic properties of a double out-of-plane carboxylato-bridged Cu(II) compound with pyridine-2-carboxylate
(2.737(4) Å). The crystalstructure of the compound is stabilized by interchain hydrogen bonds of the C–H⋯O type. The intrachain copper–copper separation is 5.178(3) Å, whereas the shortest interchain copper–copperdistance is 7.614(6) Å. The magnetic properties, investigated in the temperature range 1.8–300 K, revealed the occurrence of a weak intrachain antiferromagnetic coupling, J = −1.04 cm−1,
深蓝色[Cu(2-pca)2 ] n(1的光谱和磁学性质以及晶体结构),(2-pca =吡啶-2-羧酸根离子)被描述。铜(II)离子处于严重四边形扭曲的八面体环境中。它们依次通过平面外的双羧酸盐桥桥接,从而形成无限链(1D)。赤道Cu–O键(1.957(3)Å)明显短于轴向键(2.737(4)Å)。该化合物的晶体结构通过C–H⋯O型链间氢键得以稳定。链内铜铜间距为5.178(3)Å,而链间铜铜间距最短为7.614(6)Å。在1.8–300 K的温度范围内进行的磁性研究表明,发生了弱链内反铁磁耦合,J = −1.04 cm -1,以及链间交换相互作用,zJ '= 0.34 cm -1。标题化合物似乎是化学计量相同的蓝紫色化合物(2)的多晶型物,最近已报道了其X射线结构。考虑到羧基桥联基团和链间氢键的存在,进行了磁结构相关性研究(1)。比较了1和多晶型2的结构和磁性。
The first cyanuric acid adduct incorporated with metal complex: a novel bi-layered structure constructed by hydrogen bonds
Abstract The synthesis and molecular packing analysis of the first example of cyanuricacidadduct with the insertion of the metal complex moiety have been reported. In this compound of cyanuricacid with Cu(pic)2(H2O) in a 2:1 ratio (Hpic = picolinic acid), cyanuricacid forms molecular tapes through the formation of strong cyclic N–H⋯O hydrogen bonds between the adjacent molecules. These tapes are