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101.
Two new iron(III)-potassium phosphonate cage complexes with {K(2)Fe(6)} and {K(2)Fe(4)} cores are reported. Magnetic studies reveal antiferromagnetic interactions between the Fe(III) centres occur in these cages. 相似文献
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103.
McRobbie A Sarwar AR Yeninas S Nowell H Baker ML Allan D Luban M Muryn CA Pritchard RG Prozorov R Timco GA Tuna F Whitehead GF Winpenny RE 《Chemical communications (Cambridge, England)》2011,47(22):6251-6253
Hexametallic chromium(III) chains can act as fluoride donor ligands to lanthanide ions giving {(Cr(6))Ln(x)}(n) complexes; preliminary spectroscopic studies are reported. 相似文献
104.
Blagg RJ Tuna F McInnes EJ Winpenny RE 《Chemical communications (Cambridge, England)》2011,47(38):10587-10589
Pentametallic Ln complexes of formula [Ln(5)O(O(i)Pr)(13)] have been made, where Ln(III) = Sm, Gd, Tb, Ho and Er; slow magnetisation relaxation to 33 K is observed for the Ho complex with an energy barrier of ca. 400 K. 相似文献
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107.
WINPENNY Richard E. P. 《中国科学:化学(英文版)》2012,55(6):910-913
Three new iron(Ⅲ) phosphonate cage-like complexes with [Fe 4 ], [Fe 9 ] and [Fe 14 ] cores have been synthesized by solvothermal reaction with various starting materials. Magnetic studies show overall antiferromagnetic interaction presented in these cages. 相似文献
108.
Faust TB Bellini V Candini A Carretta S Lorusso G Allan DR Carthy L Collison D Docherty RJ Kenyon J Machin J McInnes EJ Muryn CA Nowell H Pritchard RG Teat SJ Timco GA Tuna F Whitehead GF Wernsdorfer W Affronte M Winpenny RE 《Chemistry (Weinheim an der Bergstrasse, Germany)》2011,17(50):14020-14030
We present a synthetic, structural, theoretical, and spectroscopic study of a family of heterometallic ring dimers which have the formula [{Cr(7)NiF(3)(Etglu)(O(2)CtBu)(15)}(2)(NLN)], in which Etglu is the pentadeprotonated form of the sugar N-ethyl-D-glucamine, and NLN is an aromatic bridging diimine ligand. By varying NLN we are able to adjust the strength of the interaction between rings with the aim of understanding how to tune our system to achieve weak magnetic communication between the spins, a prerequisite for quantum entanglement. Micro-SQUID and EPR data reveal that the magnetic coupling between rings is partly related to the through-bond distance between the spin centers, but also depends on spin-polarization mechanisms and torsion angles between aromatic rings. Density functional theory (DFT) calculations allow us to make predictions of how such chemically variable parameters could be used to tune very precisely the interaction in such systems. For possible applications in quantum information processing and molecular spintronics, such precise control is essential. 相似文献
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110.
Peng‐Bo Jin Yuan‐Qi Zhai Ke‐Xin Yu Richard E. P. Winpenny Yan‐Zhen Zheng 《Angewandte Chemie (International ed. in English)》2020,59(24):9350-9354
The dicarbollide ion, nido‐C2B9H112? is isoelectronic with cyclopentadienyl. Herein, we make dysprosiacarboranes, namely [(C2B9H11)2Ln(THF)2][Na(THF)5] (Ln=Dy, 1Dy ) and [(THF)3(μ‐H)3Li]2[{η5‐C6H4(CH2)2C2B9H9}Dy{η2:η5‐C6H4(CH2)2C2B9H9}2Li] 3Dy and show that dicarbollide ligands impose strong magnetic axiality on the central DyIII ion. The effective energy barrier (Ueff) for the loss of magnetization can be varied by the substitution pattern on the dicarbollide. This finding is demonstrated by comparing complexes of nido‐C2B9H112? and nido‐[o‐xylylene‐C2B9H9]2?, which show a Ueff of 430(5) K and 804(7) K, respectively. The blocking temperature defined by the open hysteresis temperature of 3Dy reaches 6.8 K. Moreover, the linear complex [Dy(C2B9H11)2]? is predicted to have comparable properties with the linear [Dy(CpMe3)2]+ complex. As such, carboranyl ligands and their derivatives may provide a new type of organometallic ligand for high‐performance single‐molecule magnets. 相似文献