Synthesis, structure and characterisation of two 2,4-diamino-6-R-1,3,5-triazine derivatives (R=3-cyanophenyl and 4-cyanophenyl)
作者:Jan Janczak、Ryszard Kubiak
DOI:10.1016/j.molstruc.2005.04.028
日期:2005.9
are not planar, but due to small rotations about the C–C bond the cyanophenyl and the 1,3,5-triazine rings are inclined by 3.4(1) and 17.3(1)° in 1 and 2, respectively. Meanwhile, the geometries of isolated molecules 1 and 2, both are planar, when optimised theoretically. Thus in the crystal the rotation of one ring in relation to other results from the intermolecular interactions like hydrogen bonds
摘要 两种三嗪衍生物,2,4-二氨基-6-(3'-氰基苯基)-1,3,5-三嗪 (1) 和 2,4-二氨基-6-(4'-氰基苯基)-1,3,通过将氰基胍加入到 1,3- 和 1,4- 二氰基苯中,已获得结晶形式的 5-三嗪 (2)。在这两种情况下,将氰基胍加成到二氰基苯异构体的 CN 基团并形成三嗪环需要两个氢从氰基胍的一个胺基迁移到其氰基。在 1,3,5-三嗪闭环反应的最后一步,二氰基苯的 CN 基团有助于氢从一个胺基团迁移到氰基胍的氰基基团。在这两种情况下(1,3-二氰基苯和 1,4-二氰基苯),氰基胍分子的加成仅在二氰基苯的两个 CN 基团之一并入三嗪环时发生。两种三嗪衍生物均在 P21/c (1) 和 C2/c (2) 空间群的单斜晶系中结晶。在晶体中,分子不是平面的,但由于围绕 C-C 键的小旋转,氰基苯基和 1,3,5-三嗪环在 1 和 2 中倾斜 3.4(1) 和 17.3(