The presence of localised CâXâ¯Ï [or CâXâ¯Ï(CC)] interactions are shown to be pivotal in the crystal structures of (5-methyl-1-(4-X-arylamino)-1H-1,2,3-triazol-4-yl)methanol derivatives, X = H (1), F (2) and Cl (3). In the absence of halide (1), molecules aggregate into supramolecular chains via alternating ten-membered â¯HOC2N}2 and 14-membered â¯HN2C3O}2 synthons. Molecules assemble into a three-dimensional architecture via edge-to-face CâHâ¯Ï(arene) interactions occurring between the phenyl rings. In the presence of halide (i.e. F (2) and Cl (3) in the 4-position of the phenyl ring), two-dimensional arrays are formed by interconnected ten-membered â¯HOC2N}2 (as seen in 1) and 24-membered â¯HOâ¯NC2OHâ¯N4H}2 hydrogen bonded synthons. The latter arrangement allows for the close approach of halide to the 1,2,3-triazole ring and the formation of CâXâ¯Ï interactions which appear to be particularly significant in the case of Cl (3), as evidenced by systematic changes (i.e. elongation) in the geometric parameters within the five-membered ring. In this series of structures, the presence of CâXâ¯Ï interactions is shown to moderate the supramolecular aggregation based on conventional hydrogen bonding.
在(5-甲基-1-(4-X-芳基
氨基)-
1H-1,2,3-三唑-4-基)
甲醇衍
生物的晶体结构中,X = H (1)、F (2) 和 Cl (3),CâXâ¯Ï(或 CâXâ¯Ï(CC))相互作用的存在至关重要。在无卤化物(1)的情况下,分子通过交替的十元â¯HOC2N}2和十四元â¯HN2C3O}2合成单元聚集成超分子链。分子通过苯环之间的边缘对边缘CâHâ¯Ï(
芳烃)相互作用组装成三维结构。在有卤化物(即苯环4位上的F (2)和Cl (3))的情况下,二维阵列由相互连接的十元â¯HOC2N}2(如1所示)和二十四元â¯HOâ¯NC2OHâ¯N4H}2氢键合成单元形成。后一种排列使卤化物能够接近
1,2,3-三唑环并形成CâXâ¯Ï相互作用,在Cl (3)的情况下,这种相互作用显得尤为重要,五元环内几何参数的系统变化(即伸长)证明了这一点。在这一系列