The synthesis of a novel nonlinear optical (NLO) chromophore with threefold symmetry − 2,5,8-tris(diethylamino)-1,3,4,6,7,9,9b-heptaazaphenalene (4) − is reported. Compound 4 was synthesized from 2,5,8-trichloro-1,3,4,6,7,9,9b-heptaazaphenalene (3) through a nucleophilic aromatic substitution, its structural assignment was confirmed by X-ray investigations, and its second-order polarisability (β) was determined by hyper Rayleigh scattering (HRS). Compound 4 shows a very high absorbance coefficient in the UV and a remarkably large β value despite its short-wavelength absorption. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

中文翻译：

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供体取代的七氮杂菲作为具有多重电荷转移跃迁的非线性光学活性分子

报道了具有三重对称性的新型非线性光学 (NLO) 发色团 - 2,5,8-三(二乙氨基)-1,3,4,6,7,9,9b-七氮杂苯 (4) - 的合成。化合物 4 由 2,5,8-三氯-1,3,4,6,7,9,9b-七氮杂菲那烯 (3) 通过亲核芳香取代合成，其结构分配由 X 射线研究证实，其二阶极化率 (β) 由超瑞利散射 (HRS) 确定。化合物 4 在 UV 中显示出非常高的吸收系数和非常大的 β 值，尽管它的吸收波长很短。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)