In order to pursue the possibility of charge-transfer organic ferromagnets, magnetic properties of the monocationic ClO4- and BF4-salts of a triaminobenzene derivative, 1,3,5-tris[bis(p-methoxyphenyl)amino]benzene (TBMAB), were characterized by means of ESR and a Faraday-type magnetic balance. MNDO-PM3 calculations predicted 1,3,5-tris(diphenylamino)benzene (TDAB) dication and trication to be ground-state triplet and quartet, respectively. Thus these triaminobenzenes fulfill the necessary precondition for the appearance of intermolecular ferromagnetic coupling based on so-called McConnell’s second model. Negative Weiss constants (−1 to 0 K) and low spin concentrations (7—8 %) were observed for TBMAB–ClO4 and TBMAB–BF4, although, according to this rule, intermolecular ferromagnetic coupling is expected to occur for these systems.
为了探索电荷转移
有机铁磁体的可能性,我们通过 ESR 和法拉第式磁天平对三
氨基苯衍
生物 1,3,5-三[双(对
甲氧基苯基)
氨基]苯 (T
BMAB) 的单配位
ClO4 盐和
BF4 盐的磁性能进行了表征。根据 MNDO-PM3 计算,1,3,5-三(二苯基
氨基)苯(T
DAB)的二阳离子和三阳离子分别为基态三重和四重。因此,根据所谓的麦康奈尔第二模型,这些三
氨基苯符合出现分子间
铁磁耦合的必要前提条件。在 T
BMAB- 和 T
BMAB- 中观察到了负韦斯常数(-1 至 0 K)和低自旋浓度(7-8 %),尽管根据这一规则,分子间
铁磁耦合有望在这些体系中出现。