Aggregation of tetranuclear Mn building blocks with alkali ion. Syntheses, crystal structures and chemical behaviors of monomer, dimer and polymer containing [Mn4(mu(3)-O)(2)](8+) units
文献类型：期刊论文
| 作者 | Huang, Deguang; Zhang, Xiaofeng; Ma, Chengbing; Chen, Hui; Chen, Changneng; Liu, Qiutian; Zhang, Chunxi; Liao, Daizheng; Li, Licun |
| 刊名 | DALTON TRANSACTIONS
 |
| 出版日期 | 2007 |
| 期号 | 6页码:680-688 |
| ISSN号 | 1477-9226 |
| DOI | 10.1039/b609948c |
| 英文摘要 | Aggregation of tetranuclear Mn4O2 building blocks with alkali ion was studied. Several Mn( III) complexes containing [ Mn4O2(AcO)(7)( pyz)(2)](-) ( pyz = pyrazinate) anion(s) were obtained from an assembly system containing Mn(II), MnO4-, HOAc and Hpyz ( Napyz or Kpyz). These [ Mn4O2](8+) complexes have monomeric ( 1 and 2), dimeric ( 4 and 5) and one- dimensional chain ( 3) structures of which alkali metal ion connects the Mn ions of adjacent [ Mn4O2](8+) units through mu(1,1)-and mu(1,3)- carboxylate bridges. Complexes 2 or 3 were converted into [ Mn12O12(AcO)(16)( H2O)(4)] in EtOH solution in the presence of HOAc. However, in MeOH solution, a coordination polymer [ Mn-2( HCOO)(4)( H2O)(4)](n) was obtained accompanying the oxidation of MeOH to become HCHO and HCOOH. Tracing the H-1 NMR spectra of 2 or 3 in CD3OD, the disappearance of the resonance signals in 3 h indicated the decomposition of the [ Mn4O2](8+) cores. Complex 2 exhibits its proton NMR signals in CDCl3 which are similar to those of its pic analogue but accompany downfield shift to various extents for all the corresponding signals. Variable-temperature magnetic susceptibilities of complexes 2 - 5 in the range 5 - 300 K were recorded and were fitted for an Mn4O2 butterfly core, giving the fitting parameters J(bb) =-2.67 to -3.76 cm(-1) and J(wb) =-1.16 to -3.14 cm(-1). Small J values indicate weak antiferromagnetic coupling interactions of the Mn( III) sites and the spin ground states are considered as S-T = 0 based on the J(bb)/J(wb) ratio approximate to 1 for these complexes. The ESR spectra were recorded for complex 2 in dual-mode at liquid-helium temperatures and no obvious signal could be found. The addition of p-cresol gives rise to the reduction of the [ Mn4O2](8+), resulting in observable signals. |
| 语种 | 英语 |
| WOS记录号 | WOS:000243888700010 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/61005]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Liu, Qiutian |
| 作者单位 | 1.Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China 2.Chinese Acad Sci, Inst Chem, Lab Photochem, Ctr Mol Sci, Beijing 100080, Peoples R China 3.Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Deguang,Zhang, Xiaofeng,Ma, Chengbing,et al. Aggregation of tetranuclear Mn building blocks with alkali ion. Syntheses, crystal structures and chemical behaviors of monomer, dimer and polymer containing [Mn4(mu(3)-O)(2)](8+) units[J]. DALTON TRANSACTIONS,2007(6):680-688. |
| APA | Huang, Deguang.,Zhang, Xiaofeng.,Ma, Chengbing.,Chen, Hui.,Chen, Changneng.,...&Li, Licun.(2007).Aggregation of tetranuclear Mn building blocks with alkali ion. Syntheses, crystal structures and chemical behaviors of monomer, dimer and polymer containing [Mn4(mu(3)-O)(2)](8+) units.DALTON TRANSACTIONS(6),680-688. |
| MLA | Huang, Deguang,et al."Aggregation of tetranuclear Mn building blocks with alkali ion. Syntheses, crystal structures and chemical behaviors of monomer, dimer and polymer containing [Mn4(mu(3)-O)(2)](8+) units".DALTON TRANSACTIONS .6(2007):680-688. |
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来源：化学研究所
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