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481.
In the present Note, we provide new analytical expressions of the components of Hill tensor (or equivalently the Eshelby tensor ) associated to an arbitrarily oriented crack in orthotropic elastic medium. The crack is modelled as an infinite cylinder along a symmetry axis of the matrix, with low aspect ratio. The three dimensional results obtained show explicitly the interaction between the primary (structural) anisotropy and the crack-induced anisotropy. They are validated by comparison with existing results in the case where the crack is in a symmetry plane. To cite this article: C. Gruescu et al., C. R. Mecanique 333 (2005). 相似文献
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Dr. Sarah Puhl Dr. Torben Steenbock Prof. Dr. Carmen Herrmann Prof. Dr. Jürgen Heck 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(6):2428-2434
Pinching molecules via chemical strain suggests intuitive consequences, such as compression at the pinched site and clothespin-like opening of other parts of the structure. If this opening affects two spin centers, it should result in reduced communication between them. We show that for naphthalene-bridged biscobaltocenes with competing through-space and through-bond pathways, the consequences of pinching are far less intuitive: despite the known dominance of through-space interactions, the bridge plays a much larger role for exchange spin coupling than previously assumed. Based on a combination of chemical synthesis, structural, magnetic, and redox characterization, and a newly developed theoretical pathway analysis, we can suggest a comprehensive explanation for this non-intuitive behavior. These results are of interest for molecular spintronics, as naphthalene-linked cobaltocenes can form wires on surfaces for potential spin-only information transfer. 相似文献
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Dr. Jun-Liang Liu Prof. Dr. Kasper S. Pedersen Dr. Samuel M. Greer Dr. Itziar Oyarzabal Dr. Abhishake Mondal Prof. Dr. Stephen Hill Dr. Fabrice Wilhelm Dr. Andrei Rogalev Dr. Alain Tressaud Etienne Durand Prof. Dr. Jeffrey R. Long Dr. Rodolphe Clérac 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(26):10392-10396
Silicon-mediated fluoride abstraction is demonstrated as a means of generating the first fluorido-cyanido transition metal complexes. This new synthetic approach is exemplified by the synthesis and characterization of the heteroleptic complexes, trans-[MIVF4(CN)2]2− (M=Re, Os), obtained from their homoleptic [MIVF6]2− parents. As shown by combined high-field electron paramagnetic resonance spectroscopy and magnetization measurements, the partial substitution of fluoride by cyanide ligands leads to a marked increase in the magnetic anisotropy of trans-[ReF4(CN)2]2− as compared to [ReF6]2−, reflecting the severe departure from an ideal octahedral (Oh point group) ligand field. This methodology paves the way toward the realization of new heteroleptic transition metal complexes that may be used as highly anisotropic building-blocks for the design of high-performance molecule-based magnetic materials. 相似文献
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