Donor–acceptor–donor (D–A–D)-type molecules are considered as a promising class of NIR fluorescence materials. In this communication, 4,7-di(9H-carbazol-9-yl)-[1,2,5]oxadiazolo[3,4-d]pyridazine was obtained by dehydrogenation of 4,7-bis(1,2,3,4,4a,9a-hexahydro-9H-carbazol-9-yl)-[1,2,5]oxadiazolo[3,4-d]pyridazine with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone in toluene. The structure of the synthesized compound was established by elemental analysis; high-resolution mass spectrometry; ¹H, ¹³C NMR, IR, and UV spectroscopy; and mass spectrometry. The photophysical properties of the title compound were studied and compared with spectral data of the [1,2,5]thiadiazolo[3,4-d]pyridazine analogue.

中文翻译：

---

4,7-二(9H-咔唑-9-基)-[1,2,5]恶二唑并[3,4-d]哒嗪

供体-受体-供体（D-A-D）型分子被认为是一类有前途的近红外荧光材料。在本通讯中，4,7-二(9 H-咔唑-9-基)-[1,2,5]恶二唑并[3,4- d ]哒嗪是通过4,7-双(1,2 ,3,4,4a,9a-hexahydro-9 H -carbazol-9-yl)-[1,2,5]oxadiazolo[3,4- d ]哒嗪与 2,3-dichloro-5,6-dicyano-甲苯中的 1,4-苯醌。通过元素分析确定了合成化合物的结构；高分辨率质谱；¹ H、¹³ C NMR、IR 和 UV 光谱；和质谱。研究了标题化合物的光物理性质，并与[1,2,5]噻二唑并[3,4- d ]的光谱数据进行了比较]哒嗪类似物。