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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Syntheses, crystal structures and magnetic properties of two mixed-valence Co(III) Co(II) compounds derived from Schiff base ligands: field-supported single-ion-magnet behavior with easy-plane anisotropy
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Syntheses, crystal structures and magnetic properties of two mixed-valence Co(III) Co(II) compounds derived from Schiff base ligands: field-supported single-ion-magnet behavior with easy-plane anisotropy

机译：来自Schiff碱配体的两个混合价CO（III）CO（II）化合物的合成，晶体结构和磁性，具有易平面各向异性的现场支撑的单离子磁体行为

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摘要

Two mu-phenoxo-mu(1,1)-azide dinuclear (CoCoII)-Co-III complexes [Co-III(N-3)(2)L-1(mu(1,1)-N-3) Co-II(N-3)]center dot MeOH (1) and [Co-III(N-3)(2)L-1(mu(1,1)-N-3) Co-II(N-3)]center dot MeOH (2) (HL1 and HL2 are two Schiff base ligands having N2O-N2O compartments) both possess one hexacoordinate Co(III) and one pentacoordinate Co(II) center. DC magnetic susceptibility and magnetization measurements show an appreciable amount of positive magnetic anisotropy (D/hc similar to 40 cm(-1)) that is also confirmed by ab initio CASSCF calculations. AC susceptibility measurements of 1 reveal that it exhibits a slow magnetic relaxation with two relaxation channels. The external magnetic field supports the low-frequency (LF) channel that escapes on heating more progressively than the high-frequency (HF) branch. The relaxation time is as slow as tau = 255 ms at T = 1.9 K and B-DC = 0.6 T, where the LF mole fraction is 69%. The complex 2 also displays similar field-supported slow magnetic relaxation with two relaxation channels.
机译：两种Mu-phenoxo-mu（1,1） - 氮化物二核（CocoII）-Co-III配合物[Co-III（N-3）（2）L-1（MU（1,1）-N-3）CO -ii（n-3）]中心点MeOH（1）和[Co-III（N-3）（2）L-1（MU（1,1）-N-3）CO-II（N-3）中心点MeOH（2）（HL1和HL2是具有N2O-N2O隔室的两个席夫碱配体）都具有一个六谱CO（III）和一个五谱CO（II）中心。直流磁化率和磁化测量显示出可明显的正磁各向异性（类似于40cm（-1））的正磁各向异性（D / HC），其也通过AB Initio Casscf计算证实。 AC易感性测量为1揭示它表现出具有两个松弛通道的缓慢磁性松弛。外部磁场支持低频（LF）通道，其比高频（HF）分支更逐渐脱离加热。弛豫时间在T = 1.9 k和B-DC = 0.6T的Tau = 255ms慢，LF摩尔分数为69％。复合体2还显示出类似的现场支持的慢磁性宽磁性宽松，两个弛豫通道。

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