Syntheses, crystal structures and magnetic properties of two Ni-4(mu(3)-phenoxido)(4) cubanes: Role of additional bridging carboxylates
文献类型：期刊论文
| 作者 | Mandal, Leena1; Ghosh, Sagar1; Liu, Cai-Ming2; Mohanta, Sasankasekhar1 |
| 刊名 | POLYHEDRON
 |
| 出版日期 | 2017-06-17 |
| 卷号 | 129页码:199-207 |
| 关键词 | Tetranickel(Ii) Cubane Magnetic Properties Macrocyclic Ligand Phenoxo-carboxylate Bridged |
| 英文摘要 | The work in the present investigation reports the syntheses, crystal structures, ESI-MS (positive) and variable -temperature and variable-field magnetic properties of two Ni4O4 cubane compounds of composition [(Ni4L2)-L-II(mu(1, 3)-HCO2)(2)](ClO4)(2)center dot 2H(2)O (1) and [(Ni4L2)-L-II(mu(1, 3)-o-ClPhCO2)(2)](ClO4)(2)center dot 3H(2)O (2) derived from the Robson type tetraiminodiphenol macrocyclic ligand H2L (2 + 2 condensation of 4-ethyl-2,6-diformylphenol and 2,2-dimethyl-1,3-diaminopropane). All the four oxygen atoms of the distorted cubane are phenoxido oxygen atoms, coming from two deprotonated macrocycle, [L](2-), i.e., these compounds are Ni-4(mu(3)-phenoxido)(4) cubanes. The nickel(II) centers in each of the two pairs in two opposite faces of the cube are additionally bridged by a syn-syn carboxylate, formate in I and o-chlorobenzoate in 2. Variable-temperature and variable-field magnetization data reveal an overall antiferromagnetic interaction in both 1 and 2, where two of the six pathways are ferromagnetic (4.06 cm(-1) in 1 and 1.58 cm(-1) in 2) and the remaining four pathways are antiferromagnetic (-3.03 cm(-1) in 1 and -1.55 cm(-1) in 2). The possibility of a.) versus Nin-O(phenoxo)-Ni-II angle correlation and the roles of carboxylate moiety as well as energy difference between the first excited state and ground state on magnetic properties have been discussed. (C) 2017 Elsevier Ltd. All rights reserved. |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/38498]  |
| 专题 | 化学研究所_有机固体实验室 |
| 作者单位 | 1.Univ Calcutta, Dept Chem, 92 APC Rd, Kolkata 700009, India 2.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mandal, Leena,Ghosh, Sagar,Liu, Cai-Ming,et al. Syntheses, crystal structures and magnetic properties of two Ni-4(mu(3)-phenoxido)(4) cubanes: Role of additional bridging carboxylates[J]. POLYHEDRON,2017,129:199-207. |
| APA | Mandal, Leena,Ghosh, Sagar,Liu, Cai-Ming,&Mohanta, Sasankasekhar.(2017).Syntheses, crystal structures and magnetic properties of two Ni-4(mu(3)-phenoxido)(4) cubanes: Role of additional bridging carboxylates.POLYHEDRON,129,199-207. |
| MLA | Mandal, Leena,et al."Syntheses, crystal structures and magnetic properties of two Ni-4(mu(3)-phenoxido)(4) cubanes: Role of additional bridging carboxylates".POLYHEDRON 129(2017):199-207. |
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来源：化学研究所
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