A study of three isomeric compounds containing a phenolic moiety attached to the nitrogen-rich triazolo–triazole bicycle is presented. In the three isomers, the phenolic OH group is in the ortho, meta and para positions. The crystal structure analysis of the meta isomer (C10H9N5O) shows that the 2H-tautomer is present in the crystal and that the molecule adopts a substantially planar geometry. However, the conformation found in the crystal is different compared to the monoprotonated cation of the same compound previously investigated in several salts. The packing of the meta isomer is driven by the formation of strong hydrogen bonds and shows the formation of infinite planar ribbons, parallel to a, formed around 21 crystallographic axes. The three isomers were tested against some cancer cell lines and also against normal cell lines. The ortho isomer shows a weak antiproliferative activity, the meta isomer shows significant antiproliferative activity against some cancer lines and no activity against healthy cell lines, and the para isomer is active against all the tested cell lines.
本文介绍了对三种异构体化合物的研究,这三种异构体含有一个连接到富氮三唑并三唑自行车上的酚基。在这三种异构体中,酚羟基分别位于正位、偏位和对位。对元异构体(C10H9N5O)的晶体结构分析表明,晶体中存在 2H-同分异构体,分子基本呈平面几何形状。不过,晶体中的构象与之前研究过的几种盐类中同一化合物的单质子阳离子不同。元异构体的堆积是由强氢键的形成所驱动的,并显示出围绕 21 条晶体学轴线形成了平行于 a 的无限平面带状结构。对这三种异构体进行了针对一些癌细胞系和正常细胞系的测试。正异构体显示出微弱的抗增殖活性,元异构体对一些癌症细胞株显示出显著的抗增殖活性,而对健康细胞株没有活性,对位异构体对所有测试的细胞株都有活性。