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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A comparison between high-symmetry Mn-12 single-molecule magnets in different ligand/solvent environments
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A comparison between high-symmetry Mn-12 single-molecule magnets in different ligand/solvent environments

机译:不同配体/溶剂环境中高对称性Mn-12单分子磁体的比较

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We present angle-resolved high-frequency electron paramagnetic resonance (HFEPR) data collected for single-crystal samples of deuterated and undeuterated Mn-12-acetate. The spectra reveal fine structures associated with the various Mn-12 species corresponding to the different local solvent environments proposed by Cornia et al. [A. Cornia, R. Sessoli, L. Sorace, D. Gatteschi, A.L. Barra, C. Daiguebonne, Phys. Rev. Lett. 89 (2002) 257201], and recently confirmed by Hill et al. [S. Hill, R.S. Edwards, S.I. Jones, J.M. North, N.S. Dalai, Phys. Rev. Lett. 90 (2003) 217204] and del Barco et al. [E. del Barco, A.D. Kent, E.M. Rumberger, D.N. Hendrickson, G. Christou, Phys. Rev. Lett. 91 (2003) 047203]. Each of the fine structures exhibits a distinct dependence on the applied field orientation, thereby highlighting the discrete nature of the disorder. We then compare these data with spectra obtained for two recently discovered high-symmetry (S-4) analogs of Mn-12-Ac, differing only in their ligand and solvent structures. None of the highly reproducible fine-structures seen in the Mn-12-Ac samples are found for the new Mn-12 complexes, thus confirming the idea that the solvent structure significantly influences the QMT dynamics in Mn-12-Ac. Indeed, the HFEPR spectra for Mn-12-BrAc and Mn-12-tBuAc provide spectacular resolution, allowing for unique spectroscopic insights into high-symmetry giant spin SMMs. (c) 2005 Elsevier Ltd. All rights reserved.
机译:我们介绍了角度解析的高频电子顺磁共振(HFEPR)数据收集的氘和未氘化Mn-12-乙酸单晶样品。光谱揭示了与各种Mn-12物种相关的精细结构,这些结构对应于Cornia等人提出的不同的局部溶剂环境。 [一种。 Cornia,R.Sessoli,L.Sorace,D.Gatteschi,A.L. Barra,C.Daiguebonne,Phys。牧师89(2002)257201],最近得到Hill等人的证实。 [S. R.S.希尔爱德华兹(美国北卡罗莱纳州J.M.琼斯)达赖牧师90(2003)217204]和del Barco等。 [E. A.D.肯特(D. Barco),肯特(E.M. Rumberger),亨德里克森(D.N. Hendrickson),克里斯托(G.牧师91(2003)047203]。每个精细结构都表现出对所施加场定向的明显依赖性,从而突显了疾病的离散性。然后,我们将这些数据与Mn-12-Ac的两个最近发现的高对称(S-4)类似物获得的光谱进行比较,它们的配体和溶剂结构仅不同。没有发现在Mn-12-Ac样品中看到的高度可重现的精细结构用于新的Mn-12配合物,因此证实了溶剂结构会显着影响Mn-12-Ac中QMT动力学的想法。确实,Mn-12-BrAc和Mn-12-tBuAc的HFEPR光谱提供了惊人的分辨率,从而使人们对高对称巨自旋SMM的独特光谱学见解。 (c)2005 Elsevier Ltd.保留所有权利。

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