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Effect of the distant substituent on the slow magnetic relaxation of the mononuclear Co(II) complex with pincer-type ligands
Dalton Transactions ( IF 3.5 ) Pub Date : 2020/03/09 , DOI: 10.1039/d0dt00096e Cyril Rajnák 1, 2, 3, 4, 5 , Ján Titiš 1, 2, 3, 4, 5 , Ján Moncol' 5, 6, 7, 8 , Roman Boča 1, 2, 3, 4, 5
Dalton Transactions ( IF 3.5 ) Pub Date : 2020/03/09 , DOI: 10.1039/d0dt00096e Cyril Rajnák 1, 2, 3, 4, 5 , Ján Titiš 1, 2, 3, 4, 5 , Ján Moncol' 5, 6, 7, 8 , Roman Boča 1, 2, 3, 4, 5
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A hexacoordinated complex [Co(pydm)2](mdnbz)2 from the family of pincer complexes was prepared and structurally characterized. The complex behaves as an S = 3/2 spin system with a considerable zero-field splitting parameter D/hc ∼ +50 cm−1. The AC susceptibility measurements show a slow magnetic relaxation with three relaxation channels: at the low-frequency (LF), intermediate-frequency (IF) and high-frequency (HF) domains. At T = 2.0 K and an external field BDC = 0.25 T, the relaxation times of the individual modes are τ(LF) = 282 ms, τ(IF) = 3.1 ms, and τ(HF) = 0.16 ms, and the mole fractions of the slowly relaxing species are x(LF) = 0.19, x(IF) = 0.45, and x(HF) = 0.37. A comparison with the analogous complex [Co(pydm)2](dnbz)2 possessing a demethylated counter anion and identical metal cation shows that even small modifications in the composition of SIMs are no longer underestimated for the slow magnetic relaxation.
中文翻译：
远距离取代基对具有钳型配体的单核Co（II）配合物的慢磁弛豫的影响
制备了六价配合物[Co（pydm）2 ]（mdnbz）2，来自钳形配合物家族。该复合物表现为具有相当大的零场分裂参数D / hc〜 +50 cm -1的S = 3/2自旋系统。交流磁化率测量显示出具有三个弛豫通道的慢磁弛豫：在低频（LF），中频（IF）和高频（HF）域。在T = 2.0 K且外部磁场B DC = 0.25 T时，各个模式的弛豫时间为τ（LF）= 282 ms，τ（IF）= 3.1毫秒，τ（HF）= 0.16毫秒，缓弛缓物种的摩尔分数为x（LF）= 0.19，x（IF）= 0.45，x（HF）= 0.37。与具有去甲基化抗衡阴离子和相同金属阳离子的类似络合物[Co（pydm）2 ]（dnbz）2的比较显示，即使对于SIM的组成进行很小的修饰，也不会因为缓慢的磁弛豫而低估了它。
更新日期：2020-04-08
中文翻译：
远距离取代基对具有钳型配体的单核Co（II）配合物的慢磁弛豫的影响
制备了六价配合物[Co（pydm）2 ]（mdnbz）2，来自钳形配合物家族。该复合物表现为具有相当大的零场分裂参数D / hc〜 +50 cm -1的S = 3/2自旋系统。交流磁化率测量显示出具有三个弛豫通道的慢磁弛豫：在低频（LF），中频（IF）和高频（HF）域。在T = 2.0 K且外部磁场B DC = 0.25 T时，各个模式的弛豫时间为τ（LF）= 282 ms，τ（IF）= 3.1毫秒，τ（HF）= 0.16毫秒，缓弛缓物种的摩尔分数为x（LF）= 0.19，x（IF）= 0.45，x（HF）= 0.37。与具有去甲基化抗衡阴离子和相同金属阳离子的类似络合物[Co（pydm）2 ]（dnbz）2的比较显示，即使对于SIM的组成进行很小的修饰，也不会因为缓慢的磁弛豫而低估了它。
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