Dynamic formation of coordination polymers versus tetragonal prisms and unexpected magnetic superexchange coupling mediated by encapsulated anions in the cobalt(II) 1,3-bis(pyrid-4-ylthio)propan-2-one series
文献类型：期刊论文
| 作者 | Wu, BL; Yuan, DQ; Lou, BY; Han, L; Liu, CP; Zhang, CX; Hong, MC |
| 刊名 | INORGANIC CHEMISTRY
 |
| 出版日期 | 2005-12-12 |
| 卷号 | 44期号:25页码:9175-9184 |
| ISSN号 | 0020-1669 |
| DOI | 10.1021/ic050455v |
| 英文摘要 | The reactions of cobalt(II) halides and flexible ligand L [L = 1,3-bis(pyrid-4-ylthio)propan-2-one] under different conditions generated a series of complexes with various structural motifs ranging from tetragonal-prismatic cages to 1-3D coordination polymers. The layer diffusion of cobalt(II) chloride and L in methanol/acetone at 25 degrees C gave rise to a 3D polymer, [Co(L)(2)Cl(2)]center dot Me(2)CO (1). At 30 degrees C, the slow diffusion of diethyl ether into the blue dimethylformamide (DMF) solution of complex 1 afforded a 1D polymer, Co(L)Cl(2)(DMF)(2) (2). However, at 10 degrees C, the diffusion of diethyl ether into the DMF solution of complex 1 produced a tetragonal-prismatic cage, [Co(2)(L)(4)Cl(2)]Cl(2)center dot Et(2)O center dot DMF center dot 2MeOH center dot 4H(2)O (3). The reaction of cobalt(II) bromide and L in DMF at 10 degrees C yielded a dimer, [Co(2)(L)(4)Br(2)]Br(2)center dot 6DMF center dot 2H(2)O (4), with a cage structure similar to 3. The preparation of the series of compounds indicates the subtle relationship between structures and tunable reaction conditions. It is also found that the structural motifs vary according to the ligand conformations and that the formation of tetragonal-prismatic cages 3 and 4 may be templated by anionic guests. Magnetic studies on complexes 1-4 in a temperature range 4-300 K disclose that L is unfavorable for a long-range magnetic interaction; however, intramolecular spin-coupling constants of -19.6 and -21.5 cm(-1) for 3 and 4 indicate rather strong magnetic superexchanges arising from the overlap of the d(z)(2) orbitals of the cobalt(II) and p, orbitals of the encapsulated halide anions. Electron paramagnetic resonance (EPR) spectra of complexes 3 and 4 in solution and solid give information that both complexes are high-spin cobalt(II) compounds with a rhombic distortion of the axial zero-field splitting. Interestingly, the intramolecular magnetic-exchange coupling in 3 and 4 mediated by the encapsulated anion Cl(-) or Br(-) is also reflected by the EPR spectra. |
| 语种 | 英语 |
| WOS记录号 | WOS:000233796800011 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/57189]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhang, CX |
| 作者单位 | 1.Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fujian 350002, Peoples R China 2.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, BL,Yuan, DQ,Lou, BY,et al. Dynamic formation of coordination polymers versus tetragonal prisms and unexpected magnetic superexchange coupling mediated by encapsulated anions in the cobalt(II) 1,3-bis(pyrid-4-ylthio)propan-2-one series[J]. INORGANIC CHEMISTRY,2005,44(25):9175-9184. |
| APA | Wu, BL.,Yuan, DQ.,Lou, BY.,Han, L.,Liu, CP.,...&Hong, MC.(2005).Dynamic formation of coordination polymers versus tetragonal prisms and unexpected magnetic superexchange coupling mediated by encapsulated anions in the cobalt(II) 1,3-bis(pyrid-4-ylthio)propan-2-one series.INORGANIC CHEMISTRY,44(25),9175-9184. |
| MLA | Wu, BL,et al."Dynamic formation of coordination polymers versus tetragonal prisms and unexpected magnetic superexchange coupling mediated by encapsulated anions in the cobalt(II) 1,3-bis(pyrid-4-ylthio)propan-2-one series".INORGANIC CHEMISTRY 44.25(2005):9175-9184. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。