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|Title:||Origin of long-range ferromagnetic ordering in metal-organic frameworks with antiferromagnetic dimeric-Cu(II) building units|
|Authors:||Shen, L. |
|Source:||Shen, L., Yang, S.-W., Xiang, S., Liu, T., Zhao, B., Ng, M.-F., Göettlicher, J., Yi, J., Li, S., Wang, L., Ding, J., Chen, B., Wei, S.-H., Feng, Y.P. (2012-10-17). Origin of long-range ferromagnetic ordering in metal-organic frameworks with antiferromagnetic dimeric-Cu(II) building units. Journal of the American Chemical Society 134 (41) : 17286-17290. ScholarBank@NUS Repository. https://doi.org/10.1021/ja3077654|
|Abstract:||Even though metal-organic frameworks (MOFs) derived from antiferromagnetic dimeric-Cu(II) building units and nonmagnetic molecular linkers are known to exhibit unexpected ferromagnetic behavior, a comprehensive understanding of the underlying mechanism remains elusive. Using a combined theoretical and experimental approach, here we reveal the origin of the long-range ferromagnetic coupling in a series of MOFs, constructed from antiferromagnetic dimeric-Cu(II) building blocks. Our studies show that the strong localization of copper vacancy states favors spontaneous spin polarization and formation of local moment. These copper vacancy-induced moments are coupled via the itinerant electrons in the conjugated aromatic linkers to establish a long-range ferromagnetic ordering. The proposed mechanism is supported by direct experimental evidence of copper vacancies and the magnetic hysteresis (M-H) loops. © 2012 American Chemical Society.|
|Source Title:||Journal of the American Chemical Society|
|Appears in Collections:||Staff Publications|
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