A new ferrimagnet based on a radical-substituted radical cation salt.
A new ferrimagnet based on a radical-substituted radical cation salt.
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DOI：
10.1021/ja808093z
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发表时间：
2009-03
影响因子：
15
通讯作者：
Yuki Masuda;Masato Kuratsu;Shuichi Suzuki;M. Kozaki;D. Shiomi;Kazunobu Sato;T. Takui;Y. Hosokoshi;X. Lan;Y. Miyazaki;A. Inaba;K. Okada
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文献类型：
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作者：
Yuki Masuda;Masato Kuratsu;Shuichi Suzuki;M. Kozaki;D. Shiomi;Kazunobu Sato;T. Takui;Y. Hosokoshi;X. Lan;Y. Miyazaki;A. Inaba;K. Okada
自由基取代的自由基阳离子是基于分子的磁体的有吸引力的自旋构建块。引入额外的自旋作为抗衡阴离子提供了独特的三自旋系统，其中自由基取代基和自由基阳离子的自旋之间的磁性相互作用（J（内部））以及自由基阳离子和阴离子的自旋之间的磁性相互作用（J（内部））在确定系统的磁性中起决定性作用。我们报告的第一个演示的亚铁磁体利用大J（内）系统，硝酰基氮氧取代的二氢吩嗪自由基阳离子（NNDPP（*+））与四溴高铁酸盐（FeBr（4）（-））作为抗衡阴离子组合。在直流和交流磁化率和热容测量的基础上，NNDPP（*+）xFeBr（4）（-）的磁性质被阐明为三维长程有序亚铁磁体，T（c）= 6.7K。
Radical-substituted radical cations are attractive spin building blocks of molecule-based magnets. The introduction of an additional spin as a counteranion provides a unique three-spin system wherein the magnetic interactions between the spins of the radical substituent and the radical cation (J(intra)) and those between the spins of the radical cation and the anion (J(inter)) play decisive roles in determining the magnetic properties of the system. We report the first demonstration of a ferrimagnet by utilizing a large-J(intra) system, nitronyl nitroxide-substituted dihydrophenazine radical cation (NNDPP(*+)) in combination with tetrabromoferrate (FeBr(4)(-)) as the counteranion. On the basis of measurements of dc and ac magnetic susceptibilities and heat capacity, the magnetic properties of NNDPP(*+) x FeBr(4)(-) are elucidated to be those of a three-dimensional long-range-ordered ferrimagnet with T(c) = 6.7 K.