Metallocyclic Ni(4)Ln(2)M(2) single-molecule magnets
文献类型：期刊论文
| 作者 | Liu, Mei-Jiao1; Hu, Kong-Qiu1; Liu, Cai-Ming2; Cui, Ai-Li1; Kou, Hui-Zhong1 |
| 刊名 | DALTON TRANSACTIONS
 |
| 出版日期 | 2017-05-28 |
| 卷号 | 46期号:20页码:6544-6552 |
| 英文摘要 | We herein report the synthesis, crystal structure and magnetic properties of nine new heterotrimetallic complexes. [Ni(Me(2)valpn)] (H(2)Me(2)valpn = N,N'-bis(3-methoxysalicylidene)-2,2-dimethyl-1,3-diaminopropane) was used as the precursor to construct phenoxo-bridged [Ni(2)Ln](3+) (Ln(3+) = Dy, Tb, Gd and Y) species that were respectively connected by two [M(CN)(6)](3)-(M = Cr, Fe or Co) anions to form octanuclear cyclic complexes, i.e. {[Ni(Me(2)valpn)](2)Ln(H2O) M(CN)(6)} 2 in which Ln = Y, Gd, Tb and Dy and M = Cr, Fe or Co (1-9). Each of the complexes contains many lattice-bound molecules of solvation. The Ni(II) ions are penta-coordinate, while the Ln(III) ions are nine coordinated with a muffin geometry. The fitting to the.mT vs. T curves of complexes 6-9 gave the parameters of J(NiCr) = 11.82 cm-(1), J(NiGd) = 0.94 cm(-1) and g = 2.04 for complex 6, J(NiFe) = 10.58 cm(-1), J(NiGd) = 1.24 cm(-1) and g = 2.03 for complex 7, J(NiCr) = 9.4(1) cm-1, zJ' = -0.050(2) cm(-1) and g = 2.06(1) for complex 8 and J(NiFe) = 4.9(7) cm(-1), zJ' = -0.35(2) cm(-1) and g = 2.24(1) for complex 9, respectively. The dynamic magnetic investigations demonstrate that complexes 1-5 display single-molecule magnet properties with an effective energy barrier (Ueff) of 38.9 K (1, M1 = Dy, M2 = Cr), 37.2 K (2, M1 = Dy, M2 = Cr), 24.4 K (3, M1 = Dy, M2 = Co), 21.9 K (4, M1 = Tb, M2 = Cr) and 29.6 K (5, M1 = Tb, M2 = Fe), respectively. Complex 1 shows the highest energy barrier among the octanuclear [Ni(4)LnM(2)] (Ln = Dy or Tb, M = Fe, Cr, Co or W) system. Although the [Ni4Dy2Cr2] complexes have Ueff higher than that of [Ni4Dy2Fe2], complex [Ni4TbCr2] shows lower Ueff than that of [Ni4TbFe2]. The results indicate that besides the M-Cu N-Ni magnetic coupling the lanthanide ions can significantly affect the magnetic performances of heterotrimetallic SMMs as well. Moreover, the SMMs are achieved when diamagnetic Co(III) was substituted by paramagnetic Cr(III) or Fe(III) in the [Ni4Tb2 M-2] system, suggesting that the trimetallic strategy is effective in the construction of new 3d 4f SMMs. |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/38494]  |
| 专题 | 化学研究所_有机固体实验室 |
| 作者单位 | 1.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Ctr Mol Sci, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Mei-Jiao,Hu, Kong-Qiu,Liu, Cai-Ming,et al. Metallocyclic Ni(4)Ln(2)M(2) single-molecule magnets[J]. DALTON TRANSACTIONS,2017,46(20):6544-6552. |
| APA | Liu, Mei-Jiao,Hu, Kong-Qiu,Liu, Cai-Ming,Cui, Ai-Li,&Kou, Hui-Zhong.(2017).Metallocyclic Ni(4)Ln(2)M(2) single-molecule magnets.DALTON TRANSACTIONS,46(20),6544-6552. |
| MLA | Liu, Mei-Jiao,et al."Metallocyclic Ni(4)Ln(2)M(2) single-molecule magnets".DALTON TRANSACTIONS 46.20(2017):6544-6552. |
入库方式： OAI收割
来源：化学研究所
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