Effects of Alkyl Chain Length on Molecular Interactions. I. Solid Complex Formation in the Pyrene–<i>N</i>-Alkyl-2,4,6-trinitroaniline Systems
作者:Atsushi Togashi、Yoshio Matsunaga
DOI:10.1246/bcsj.57.1058
日期:1984.4
Phase diagrams were prepared for the fifteen binary systems consisting of pyrene as an electron donor and N-alkyl-2,4,6-trinitroanilines as electron acceptors. The thermal stability of the orange 1:1 complex between pyrene and the unsubstituted 2,4,6-trinitroaniline (mp 236 °C) is drastically decreased by N-alkylation; e.g., the N-pentyl-2,4,6-trinitroaniline complex melts at 97 °C. The systems with the N-hexyl and N-heptyl derivatives give two peritectics each, while most of the higher homologues produce a single peritectic or a eutectic. Unstable red solids were formed on rapid cooling of the molten pyrene–N-hexyl-2,4,6-trinitroaniline mixtures. This red complex becomes relatively more stable with increase of the alkyl chain length, possibly because of the enhanced tendency for chain alignment. In the systems with the N-pentadecyl and N-heptadecyl derivatives, the stable existence of the red 1:1 complex could be demonstrated.
以芘为电子供体、N-烷基-2,4,6-三硝基苯胺为电子受体的 15 个二元体系的相图已经绘制完成。芘与未取代的 2,4,6-三硝基苯胺之间的橙色 1:1 复合物(熔点 236 ℃)的热稳定性因 N-烷基化而急剧下降;例如,N-戊基-2,4,6-三硝基苯胺复合物在 97 ℃熔化。含有 N-己基和 N-庚基衍生物的体系会产生两种共晶,而大多数高级同系物只会产生一种共晶或共晶。在快速冷却熔融芘-N-己基-2,4,6-三硝基苯胺混合物时,会形成不稳定的红色固体。随着烷基链长度的增加,这种红色复合物变得相对更稳定,这可能是因为链排列的趋势增强了。在含有 N-十五烷基和 N-十七烷基衍生物的体系中,可以证明红色 1:1 复合物的稳定存在。