A Hydrocarbon Hexaradical with Three Localized 1,3-Cyclopentanediyl Triplet Diradicals Linked by 1,3,5-Trimethylenebenzene as Ferromagnetic Coupler: Synthesis of the Azoalkane Precursor, Photochemical Generation of the Polyradical, and EPR Characterization of Its Septet-Spin Ground State
作者:Waldemar Adam、Martin Baumgarten、Wiebke Maas
DOI:10.1021/ja0003369
日期:2000.7.1
is composed of three localized 1,3-cyclopentanediyl triplet diradicals as spin carriers, connected to the cross-conjugated ferromagnetic coupler 1,3,5-trimethylenebenzene. On nitrogen extrusion during the UV photolysis of the trisazoalkane 3 in the toluene matrix at 77 K, the characteristic triplet, quintet, and septet EPR signals for the corresponding diradical D-3, tetraradical T-3, and hexaradical
未知的三唑烷 3 被制备并光脱氮成新型七重六价 H-3,它由三个局部的 1,3-环戊二基三重双自由基作为自旋载体组成,连接到交叉共轭铁磁耦合剂 1,3,5-三亚甲基苯。在 77 K 下甲苯基质中的三唑烷烃 3 的 UV 光解过程中的氮气挤出,观察到相应双基 D-3、四基 T-3 和六基 H-3 的特征三重峰、五重峰和七重峰 EPR 信号,在 77 K 下持续数月。 六自由基的 EPR 信号的计算机模拟给出了零场参数 D = 0.00907 cm-1 和 E = 0.000187 cm-1,这与相关的多自由基非常吻合。