Irreversible transformation of chiral to achiral polymorph of K[Co(HCOO)(3)]: synthesis, structures, and magnetic properties
文献类型：期刊论文
| 作者 | Duan, Zhiming; Wang, Zheming; Gao, Song |
| 刊名 | DALTON TRANSACTIONS
 |
| 出版日期 | 2011 |
| 卷号 | 40期号:17页码:4465-4473 |
| ISSN号 | 1477-9226 |
| DOI | 10.1039/c0dt01701a |
| 英文摘要 | We report the rare observation of an irreversible transformation from a chiral to an achiral crystal through the syntheses of two polymorphs of K[Co(HCOO)(3)], and their characterization using single and powder crystal X-ray diffractions, infrared spectroscopy, thermal analyses, and the study of their magnetic properties. The kinetic phase (1), obtained under a high concentration of reactants, has a chiral (4(9).6(6)) framework and adopts the hexagonal space-group P 6(3)22. The thermodynamic phase (2), obtained from dilute solution, has an achiral (4(12).6(3)) framework and adopts a monoclinic space group C 2/c. Once 1 has crystallized out from the concentrated solution, it dissolves slowly at the expense of the formation of 2. In the solid state 1 is irreversibly transformed to 2 very slowly at ambient conditions. The transformation is accompanied by an increase of the crystal density, a change of coordination mode of some formates from anti-anti to syn-anti and a change in the coordination number of K from 6 to 8. 1 is a spin-canted antiferromagnet (T-N = 8.3 K) displaying two steps in the isothermal magnetization at 2 K, a spin-flop at 1.2 kOe and a flip to paramagnetic phase at 42.0 kOe. 2 is an antiferromagnet (T-N = 2.0 K). Thermal properties and IR spectra of the two polymorphs have been studied, showing some differences. |
| 语种 | 英语 |
| WOS记录号 | WOS:000289686600016 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/73171]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Wang, Zheming |
| 作者单位 | Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Duan, Zhiming,Wang, Zheming,Gao, Song. Irreversible transformation of chiral to achiral polymorph of K[Co(HCOO)(3)]: synthesis, structures, and magnetic properties[J]. DALTON TRANSACTIONS,2011,40(17):4465-4473. |
| APA | Duan, Zhiming,Wang, Zheming,&Gao, Song.(2011).Irreversible transformation of chiral to achiral polymorph of K[Co(HCOO)(3)]: synthesis, structures, and magnetic properties.DALTON TRANSACTIONS,40(17),4465-4473. |
| MLA | Duan, Zhiming,et al."Irreversible transformation of chiral to achiral polymorph of K[Co(HCOO)(3)]: synthesis, structures, and magnetic properties".DALTON TRANSACTIONS 40.17(2011):4465-4473. |
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来源：化学研究所
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