Self-organized honeycomb structures of Mn(12) single-molecule magnets.
Self-organized honeycomb structures of Mn(12) single-molecule magnets.
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DOI：
10.1021/jp906520j
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Hang Sun;Wen Li;Lance A. Wollenberg;Bao Li;Lixin Wu;Fengyan Li;Lin Xu
中科院分区：
文献类型：
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作者：
Hang Sun;Wen Li;Lance A. Wollenberg;Bao Li;Lixin Wu;Fengyan Li;Lin Xu
本文采用简单的溶液浇注工艺，在高相对湿度条件下，通过将脂肪酸修饰成Mn(12)团簇，成功地构建了基于Mn(12)的有序蜂窝结构。红外光谱和磁滞回线研究证实，Mn(12)-脂肪酸络合物保持了单分子磁体的典型特征。研究了Mn(12)络合物的浓度、湿气流速度、溶剂、衬底和烷基链长对蜂窝结构形貌的影响，结果表明，这种自组织蜂窝结构薄膜的形成具有广泛的普遍性和较高的重现性。通过调节络合溶液的浓度，得到了二维和三维蜂窝结构。基于Mn(12)的蜂窝图案薄膜在室温下保持顺磁响应，从而在衬底上产生空间分布的磁性图案，可以用磁力显微镜进行成像。重要的是，在蜂窝结构的薄膜中，Mn(12)络合物在低温下的单分子磁性得到了很好的保持，这代表了高密度信息存储和量子计算应用的前景。
In this paper, Mn(12)-based ordered honeycomb structures were successfully constructed from a simple solution casting process at high relative humidity through the modification of fatty acids to Mn(12) clusters. Mn(12)-fatty acid complexes maintain typical features of a single-molecule magnet as confirmed by IR spectra and magnetization hysteresis studies. Investigation of the effects of concentration, velocity of humid airflow, solvent, substrate, and alkyl chain length of the Mn(12) complex on the morphology of the honeycomb structures demonstrated wide generality and high reproducibility of the formation of Mn(12)-based self-organized honeycomb-patterned films. Both two-dimensional and three-dimensional honeycomb structures were obtained by adjusting the concentration of the complex solution. Mn(12)-based, honeycomb-patterned films maintain a paramagnetic response at room temperature, and thus give rise to a spatially distributed magnetic pattern on the substrate, which can be imaged by magnetic force microscopy. Importantly, the single-molecule magnetic property of the Mn(12) complex at low temperature is well maintained in the honeycomb-patterned film, which represents a promising outlook for high-density information storage and quantum computing applications.