Solvent/Anion-Induced Structural Modification in a Discrete {Co<sub>14</sub>} Clusters
作者:Peng-Fei Yao、Hai-Ye Li、He-Dong Bian、Hong Liang、Fu-Ping Huang
DOI:10.1021/acs.cgd.9b01320
日期:2020.2.5
We present here a nested [Co4⊂Co10] cluster consist of an inner [Co4(μ3-OH)4] cubane and a [Co10(dpbt)6Cl12] adamantane periphery, formulated as [Co14(μ3-OH)4(dpbt)6Cl12]·14CH3CH2OH (1) (here, H2dpbt ligand= 5,5′-di(pyridin-2 -yl)-3,3′-bi(1,2,4-triazole)). After suitable modifications in the aspects of solvent and substitutional anion reaction conditions, three crystalline Co14} clusters with the same skeleton of 1, formulated as [Co14(μ3-OH)4(dpbt)6Cl12]·11CH3CN (2), [Co14(μ3-OH)4(dpbt)6Cl12]·6CH3CH2COCH3 (3), and [Co14(μ3-OH)4(dpbt)6 Cl12] ·4CH3COCH3 (4), and a bromo-derivative Co14} cluster, [Co14(μ3-OH)4 (dpbt)6Br12]·4CH3CH2OH (5), consist of an [Co10(dpbt)6Br12] adamantane periphery, respectively. The procedure of the structural modification from 1 to 4, can be intuitionally tracked by scanning electron microscope (SEM). Besides, all the compounds 1–5 exhibit spin-glass-like relaxation between 3 and 12 K, as well as canted antiferromagnetic behavior with the canting angles of 1.27, 0.32, 1.89, 0.20, and 0.24°, respectively.
我们在此介绍一种嵌套的[Co4⊂Co10]团簇,它由内部的[Co4(μ3-OH)4]立方烷和外围的[Co10(dpbt)6Cl12]金刚烷组成、配制成[Co14(μ3-OH)4(dpbt)6Cl12]-14CH3CH2OH (1)(此处,H2dpbt 配体=5,5′-二(吡啶-2-基)-3,3′-双(1,2,4-三唑))。在对溶剂和取代阴离子反应条件进行适当修改后,生成了三个与 1 相同骨架的Co14}结晶簇,即[Co14(μ3-OH)4(dpbt)6Cl12]-11CH3CN (2)、[Co14(μ3-OH)4(dpbt)6Cl12]-6CH3CH2COCH3(3)和[Co14(μ3-OH)4(dpbt)6Cl12]-4CH3COCH3(4),以及溴衍生物Co14}簇、[Co14(μ3-OH)4(dpbt)6Br12]-4CH3CH2OH(5)分别由[Co10(dpbt)6Br12]金刚烷外围组成。通过扫描电子显微镜(SEM)可以直观地跟踪 1 至 4 的结构变化过程。此外,所有 1 至 5 号化合物在 3 至 12 K 之间都表现出类似自旋玻璃的弛豫,以及悬角分别为 1.27、0.32、1.89、0.20 和 0.24°的倾斜反铁磁行为。