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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Field-induced slow magnetic relaxation in mixed valence di- and tri-nuclear Co-II-Co(III )complexes
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Field-induced slow magnetic relaxation in mixed valence di- and tri-nuclear Co-II-Co(III )complexes

机译：混合价二和三核CO-II-CO（III）配合物中的场诱导的缓慢磁性松弛

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摘要

Two novel mixed valence Co-II-Co-III complexes, namely [(CoCoIII)-Co-II(L1)(ab)(mb)(2)(H2O)]center dot dmf (1) and [(Co2CoII)-Co-III(L2)(4)(H2O)(4)]center dot 2H(2)O (2) (H(2)L1 = (E)-2-((1-hydroxybutan-2-ylimino)methyl)-6-methoxyphenol, ab = 2-amino-butan-1-ol anion, mb = p-methyl benzoate, H(2)L2 = 3-((2-hydroxy-3-methoxy-benzylidene)-amino)-propionic acid, and dmf = N,N-dimethyl-formamide], were synthesized and characterized by single crystal X-ray diffraction and magnetic studies at low temperature. The structure determination reveals that both complexes belong to the monoclinic system with P21/c (1) and I2/a (2) space groups. Complex 1 is a dinuclear (CoCoII)-Co-III compound with distorted octahedral cobalt centers showing different coordination environments. In 2, a bent trinuclear (Co2CoII)-Co-III complex, the coordination environments around the two terminal Co-III sites are alike, whereas they are different in the central Co-II ion. Alternating current/direct current (ac/dc) magnetic studies revealed that both complexes show field-induced slow magnetic relaxation. The dc magnetic susceptibility and magnetization data were analyzed with the following Hamiltonian
机译：两种新的混合价CO-II-III络合物，即[（CocoIII）-CO-II（L1）（AB）（MB）（2）（2）（H2O）]中心DOT DMF（1）和[（CO2COII） - CO-III（L2）（4）（4）（H2O）（4）]中心点2H（2）O（2）（H（2）L1 =（E）-2 - （（1-羟基丁丹-2-基咪嗪）甲基）-6-甲氧基苯酚，Ab = 2-氨基 - 丁烷-1- ol阴离子，Mb = p-甲酯，H（2）L2 = 3 - （（2-羟基-3-甲氧基 - 苄基）-氨基） - 通过单晶X射线衍射和低温磁性研究合成丙酸和DMF = N，N-二甲基甲酰胺。结构测定表明，两种复合物都属于具有P21 / C的单斜晶体系（ 1）和I2 / A（2）空间组。复合物1是二维核（CocoII）-Co-III化合物，具有扭曲的八面体钴中心，显示出不同的配位环境。在2中，弯曲三核（CO2COII）-CO-III复合物，两个终端CO-III站点周围的协调环境是相似的，而它们在中央CO-II离子中不同。交流/直流（AC / DC）M令人耳源研究表明，两种复合物都显示出野外诱导的缓慢磁性松弛。用以下哈密顿人分析了DC磁性敏感性和磁化数据

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