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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Quantitative analysis of the magnetism of the meta-(methoxy)phenyl nitronyl nitroxide crystal: A bottom-up analysis of a crystal presenting competing ferro and antiferromagnetic interactions
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Quantitative analysis of the magnetism of the meta-(methoxy)phenyl nitronyl nitroxide crystal: A bottom-up analysis of a crystal presenting competing ferro and antiferromagnetic interactions

机译:间-(甲氧基)苯基亚硝酰基氮氧化物晶体磁性的定量分析:呈现竞争性铁和反铁磁相互作用的晶体的自下而上分析

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摘要

Crystals of the meta isomer of the (methoxy)phenyl nitronyl nitroxide radical, m-(OMe)PhNN, present the characteristics of an antiferromagnet (paramagnetic theta = -0.97 K, vertical bar J vertical bar = 1.6 cm(-1), [L. Angeloni, A. Caneschi, L. David, A. Fabretti, F. Ferraro, D. Gatteschi, A. le Lirzin, R. Sessoli, J. Mater. Chem. 4 (1994) 1047]). Using our quantitative bottom-up approach, we analyze here the magnetism of this crystal by first computing its magnetic topology and, then, using this information, the macroscopic magnetic susceptibility chi(7) of the crystal. The crystal presents one ferro and two antiferromagnetic exchange interactions, J(AB), of similar strength (+0.20, -0.20 and -0.11 cm(-1)) that create a complex three-dimensional magnetic topology of interacting planes. This complex network of competing ferro and antiferromagnetic pathways does not allow a sounding prediction of the macroscopic magnetic susceptibility using qualitative considerations. Our approach computes the IT versus T curve that fully reproduces the experimental shape. (c) 2005 Elsevier Ltd. All rights reserved.
机译:(甲氧基)苯基硝酰基硝基氧自由基的间位异构体晶体m-(OMe)PhNN具有反铁磁体的特征(顺磁theta = -0.97 K,竖线J竖线= 1.6 cm(-1),[ L. Angeloni,A。Caneschi,L。David,A。Fabretti,F。Ferraro,D。Gatteschi,A。le Lirzin,R。Sessoli,J。Mater。Chem。4(1994)1047])。使用我们的定量自下而上的方法,在这里,我们首先通过计算该晶体的磁拓扑,然后使用此信息,对晶体的宏观磁化率chi(7)来分析其磁性。晶体呈现出一个强度相似的强度(+ 0.20,-0.20和-0.11 cm(-1))的一个铁磁和两个反铁磁交换相互作用J(AB),从而形成了相互作用平面的复杂三维磁拓扑。铁和反铁磁路径竞争的这种复杂网络不允许使用定性考虑对宏观磁化率进行探测。我们的方法计算出IT与T的曲线,从而完全再现了实验形状。 (c)2005 Elsevier Ltd.保留所有权利。

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