Polycationic High-Spin States of One- and Two-Dimensional (Diarylamino)benzenes, Prototypical Model Units for Purely Organic Ferromagnetic Metals As Studied by Pulsed ESR/Electron Spin Transient Nutation Spectroscopy
Polycationic High-Spin States of One- and Two-Dimensional (Diarylamino)benzenes, Prototypical Model Units for Purely Organic Ferromagnetic Metals As Studied by Pulsed ESR/Electron Spin Transient Nutation Spectroscopy
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DOI：
10.1021/ja963372
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发表时间：
1997-07
影响因子：
15
通讯作者：
Kazunobu Sato;Masafumi Yano;Mutsuo Furuichi;D. Shiomi;T. Takui;K. Abe;K. Itoh;Akiji Higuchi;Katsuhiko Katsuma;Y. Shirota
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文献类型：
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作者：
Kazunobu Sato;Masafumi Yano;Mutsuo Furuichi;D. Shiomi;T. Takui;K. Abe;K. Itoh;Akiji Higuchi;Katsuhiko Katsuma;Y. Shirota
用连续波和脉冲ESR谱研究了1，3-二（二芳氨基）苯和1，3，5-三（二芳氨基）苯的聚阳离子高自旋态作为有机铁磁金属的原型模型单元.基于脉冲ESR谱的电子自旋瞬变章动（ESTIM）方法被应用于玻璃中双阳离子和三阳离子的高自旋态，明确地确定了基态分子的自旋多重性为三重态，其精细结构参数为|D| = 0.007 cm-1和四重峰，|D| = 0.004 cm-1，|E| = 0.0002 cm-1和g = 2.0023，并得出结论，高自旋基态起源于控制聚阳离子杂原子体系自旋排列的π-HOMO的拓扑赝简并性。它已被说明的分辨率增强固有的二维光谱的维度分解，磁场扫描二维Ehrman光谱是一个强大的和简便的方法…
Polycationic high-spin states of 1,3-bis(diarylamino)benzene and 1,3,5-tris(diarylamino)benzene as prototypical model units for organic ferromagnetic metals have been studied by cw and pulsed ESR spectroscopy. An electron spin transient nutation (ESTN) method as a novel technique based on pulsed ESR spectroscopy has been applied to the dicationic and tricationic high-spin states of them in glasses, unequivocally identifying the spin multiplicities of those molecules in the ground state to be triplet with the fine-structure parameters of |D| = 0.007 cm-1 and quartet with |D| = 0.004 cm-1, |E| = 0.0002 cm-1, and g = 2.0023, respectively, and concluding that the high-spin ground states originate from the topological pseudodegeneracy of the π-HOMOs which governs spin alignment in polycationic heteroatomic systems. It has been illustrated by the resolution enhancement inherent in the dimensional decomposition of 2D spectroscopy that magnetic-field-swept 2D ESTN spectroscopy is a powerful and facile method for ...