A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds.

A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds.
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构建铁磁耦合 Cr(iii) 化合物的简单方法。

DOI:
10.1039/c8dt01963k
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发表时间:
2018
期刊:
2003)
影响因子:
--
通讯作者:
Fraser HWL
Fraser HWL
中科院分区:
--
文献类型:
--
作者:
Fraser HWL

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合成了一大类铬(III)二聚体,并使用羧酸盐和二乙醇胺类配体的组合进行了磁性结构表征。化合物的通式为[Cr2(R1-Deah)2(O2Cr2)Cl2]Cl,其中R1=Me和R2=H(1)、Me(2)、CMe3(3)、Ph(4)、3,5-(Cl)2Ph(5)、(Me)5Ph(6)、R1=Et和R2=H(7)、Ph(8)。合成了化合物[Cr2(Me-Deah)2Cl4](9),以研究移除/添加羧酸桥对观测到的磁性行为的影响。直流磁化率测量表明,羧酸盐桥联族中的铬(III)中心之间存在铁磁交换作用,耦合常数在+0.37J<+8.02 cm−1范围内。去除羧酸盐生成二氧桥联化合物9导致铬(III)离子之间的反铁磁性交换。密度泛函理论计算表明,铁磁交换是引入桥联羧酸盐时产生的轨道反互补效应的结果。
A large family of chromium(III) dimers has been synthesised and magneto-structurally characterised using a combination of carboxylate and diethanolamine type ligands. The compounds have the general formula [Cr2(R1-deaH)2(O2CR2)Cl2]Cl where R1 = Me and R2 = H (1), Me (2), CMe3 (3), Ph (4), 3,5-(Cl)2Ph (5), (Me)5Ph (6), R1 = Et and R2 = H (7), Ph (8). The compound [Cr2(Me-deaH)2Cl4] (9) was synthesised in order to study the effect of removing/adding the carboxylate bridge on the observed magnetic behaviour. Direct current (DC) magnetic susceptibility measurements showed ferromagnetic (FM) exchange interactions between the Cr(III) centres in the carboxylate bridged family with coupling constants in the range +0.37 < J < +8.02 cm−1. Removal of the carboxylate to produce the dialkoxide-bridged compound 9 resulted in antiferromagnetic (AFM) exchange between the Cr(III) ions. DFT calculations reveal the ferromagnetic exchange is the result of an orbital counter-complementarity effect occuring upon introduction of the bridging carboxylate.
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