The Proof of a Triplet Ground State in the N,N′-Di-t-butyl-m-phenylenebinitroxide Biradical
The Proof of a Triplet Ground State in the N,N′-Di-t-butyl-m-phenylenebinitroxide Biradical
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N,N′-二叔丁基间亚苯基二硝基氧双自由基三重态基态的证明
DOI：
10.1246/bcsj.48.2381
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发表时间：
1975
影响因子：
4
通讯作者：
K. Ishizu
中科院分区：
文献类型：
--
作者：
K. Mukai;H. Nagai;K. Ishizu
在60 ~ 300 K温度范围内测量了N，N′-二叔丁基间苯二氮氧化物双自由基的磁化率。磁化率遵循居里-韦斯定律，顺磁居里常数为0.90±0.04 K·-emu/mol，韦斯常数为−19±2 K。这种磁化率表明双自由基的基态是三重态，并且在低于300 K的温度范围内，分子内纯三重态近似2 J>>kT是可靠的。负的韦斯常数是由于三重态之间的负交换相互作用J′<0。
The magnetic susceptibility of the N,N′-di-t-butyl-m-phenylenebinitroxide biradical has been measured in the temperature range from 60 to 300 K. The susceptibility follows the Curie-Weiss law, with a paramagnetic Curie constant of 0.90±0.04 K·-emu/mol and a Weiss constant of −19±2 K. This susceptibility suggests that the ground state of the biradical is a triplet and that an intramolecular pure triplet approximation, 2J>>kT, is reliable in the temperature region below 300 K. The negative Weiss constant is due to the negative exchange interaction, J′<0, between the triplets.