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Elise P. Kenny Anthony C. Jacko Ben J. Powell 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(42):15226-15232
We predict that the magnetic properties of [Cu(acac)2], an elastically flexible crystal, change drastically when the crystal is bent. It is found that unbent [Cu(acac)2] is an almost perfect Tomonaga–Luttinger liquid. Broken‐symmetry density‐functional calculations reveal that the magnetic exchange interactions along the chains are an order of magnitude larger than the interchain exchange. The geometrically frustrated interchain interactions cannot magnetically order the material at any experimentally accessible temperature. The ordering temperature (TN), calculated from the chain‐random‐phase approximation, increases by 24 orders of magnitude when the material is bent. We demonstrate that geometric frustration both suppresses TN and enhances the sensitivity of TN to bending. In [Cu(acac)2], TN is extremely sensitive to bending but remains too low for practical applications, even when bent. Partially frustrated materials could achieve the balance of high TN and good sensitivity to bending required for practical applications of mechanomagnetic elastic crystals. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(14):3896-3899
The fabrication of so‐called ghost‐leg sheets and their electronic properties is reported. This unique sheet structure is composed of one‐dimensional mixed‐valence nickel chains, which are linked with one another by bis(azamacrocycle) ligands. They are also topologically unique NiII/NiIII mixed‐valence complexes, as confirmed by X‐ray and optical measurements. Moreover, their magnetic susceptibilities indicated two‐dimensional antiferromagnetic behavior following the Fisher 1D chain model with interchain interactions, where spins on NiIII sites mutually interact antiferromagnetically in the sheets. 相似文献
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