Spin Frustration in a Family of Pillared Kagomé Layers of High-Spin Cobalt(II) Ions
| Autor: | Yan Meng, Long-Fei Wang, Quan-Wen Li, Ze-Min Zhang, Ming-Liang Tong, Cui-Jin Li, Wei-Quan Lin, Yan-Cong Chen, Jiang Liu |
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| Rok vydání: | 2014 |
| Předmět: |
Pyrazine
Pyridines media_common.quotation_subject Molecular Conformation chemistry.chemical_element Mineralogy Frustration Crystallography X-Ray Catalysis Ion Magnetics chemistry.chemical_compound Bipyridine Organometallic Compounds Spin (physics) media_common Ions Chemistry Ligand Organic Chemistry Cobalt General Chemistry Crystallography Quantum Theory Metal-organic framework |
| Zdroj: | Chemistry - A European Journal. 21:2560-2567 |
| ISSN: | 0947-6539 |
| Popis: | Based on the analogous kagomé [Co3 (imda)2 ] layers (imda=imidazole-4,5-dicarboxylate), a family of pillar-layered frameworks with the formula of [Co3 (imda)2 (L)3 ]⋅(L)n ⋅xH2 O (1: L=pyrazine, n=0, x=8; 2: L=4,4'-bipyridine, n=1, x=8; 3: L=1,4-di(pyridin-4-yl)benzene, n=1, x=13; 4: L=4,4'-di(pyridin-4-yl)-1,1'-biphenyl, n=1, x=14) have been successfully synthesized by a hydrothermal/solvothermal method. Single-crystal structural analysis shows a significant increase in the interlayer distances synchronized with the extension of the pillar ligands, namely, 7.092(3) (1), 10.921(6) (2), 14.780(5) (3), and 19.165(4) Å (4). Despite the wrinkled kagomé layers in complexes 2-4, comprehensive magnetic characterizations revealed weakening of interlayer magnetic interactions and an increase in the degree of frustration as the pillar ligand becomes longer from 1 to 4; this leads to characteristic magnetic ground states. For compound 4, which has the longest interlayer distance, the interlayer interaction is so weak that the magnetic properties observed within the range of temperature measured would correspond to the frustrated layer. |
| Databáze: | OpenAIRE |
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