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Spin-dimer networks: engineering tools to adjust the magnetic interactions in biradicals
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-08-15 00:00:00 , DOI: 10.1039/c7tc03357e Yulia B. Borozdina 1, 2, 3, 4, 5 , Evgeny A. Mostovich 1, 2, 3, 6, 7 , Pham Thanh Cong 3, 8, 9, 10 , Lars Postulka 3, 8, 9, 10 , Bernd Wolf 3, 8, 9, 10 , Michael Lang 3, 8, 9, 10 , Martin Baumgarten 1, 2, 3
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-08-15 00:00:00 , DOI: 10.1039/c7tc03357e Yulia B. Borozdina 1, 2, 3, 4, 5 , Evgeny A. Mostovich 1, 2, 3, 6, 7 , Pham Thanh Cong 3, 8, 9, 10 , Lars Postulka 3, 8, 9, 10 , Bernd Wolf 3, 8, 9, 10 , Michael Lang 3, 8, 9, 10 , Martin Baumgarten 1, 2, 3
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Magneto-structural correlations in stable organic biradicals have been studied on the example of weakly exchange coupled models with nitronyl nitroxide and imino nitroxide spin-carrying entities. Here, heteroatom substituted 2,2′-diaza- and 3,3′-diaza-tolane bridged biradicals were compared with the hydrocarbon analogue, while a biphenyl model with its 2,2′-bipyridine counterpart. For a 3,3′-diazatolane bridge the torsional angle between the nitronyl nitroxides and the pyridyl rings increased heavily (∼52–54°) leading to a smaller theoretical intra-dimer exchange coupling value. However, a very large antiferromagnetic coupling was obtained experimentally. This could be appropriately explained by the presence of dominating inter-dimer exchange between the molecules. For the bis(imino nitroxide) with tolane bridge a field induced ordered state between 1.8 to 4.3 T in AC-susceptibility measurements was observed. In terms of a Bose Einstein condensate (BEC) of triplons this phenomenon could be described as a magnetic field induced ordered phase with 3D character.
中文翻译：
自旋二聚体网络：调节双自由基中磁性相互作用的工程工具
在具有氮氧酰亚硝酸盐和亚氨基亚硝酸盐自旋携带实体的弱交换耦合模型的实例上，研究了稳定有机双自由基中的磁-结构相关性。在此，将杂原子取代的2,2'-二氮杂-和3,3'-二氮杂-戊二烯桥联的双自由基与烃类似物进行了比较，而联苯模型则具有2,2'-联吡啶对应物。对于3,3'-二氮杂戊二烯桥，硝酰基氮氧化物和吡啶基环之间的扭转角大大增加（〜52–54°），从而导致较小的理论二聚体内部交换偶联值。然而，通过实验获得了非常大的反铁磁耦合。这可以通过分子之间存在主要的二聚体间交换来适当地解释。对于带有甲苯桥的双（亚氨基亚硝基氮氧化物），在交流磁化率测量中观察到场诱导的有序态在1.8至4.3 T之间。就三重玻色的爱因斯坦凝聚物（BEC）而言，这种现象可以描述为磁场感应的具有3D特征的有序相。
更新日期：2017-09-14
中文翻译：
自旋二聚体网络：调节双自由基中磁性相互作用的工程工具
在具有氮氧酰亚硝酸盐和亚氨基亚硝酸盐自旋携带实体的弱交换耦合模型的实例上，研究了稳定有机双自由基中的磁-结构相关性。在此，将杂原子取代的2,2'-二氮杂-和3,3'-二氮杂-戊二烯桥联的双自由基与烃类似物进行了比较，而联苯模型则具有2,2'-联吡啶对应物。对于3,3'-二氮杂戊二烯桥，硝酰基氮氧化物和吡啶基环之间的扭转角大大增加（〜52–54°），从而导致较小的理论二聚体内部交换偶联值。然而，通过实验获得了非常大的反铁磁耦合。这可以通过分子之间存在主要的二聚体间交换来适当地解释。对于带有甲苯桥的双（亚氨基亚硝基氮氧化物），在交流磁化率测量中观察到场诱导的有序态在1.8至4.3 T之间。就三重玻色的爱因斯坦凝聚物（BEC）而言，这种现象可以描述为磁场感应的具有3D特征的有序相。
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