Structure of <i>N</i>,4-dinitroaniline and its complex with sulfolane at 85 K; on the proton donor–acceptor affinity of the primary nitramine (HNNO<sub>2</sub>) group
作者:J. Zaleski、Z. Daszkiewicz、J. B. Kyzioł
DOI:10.1107/s0108768101016548
日期:2002.2.1
4-dinitroaniline in comparison to that of its complex with sulfolane. The deviations of the internal angles of the aromatic ring from 120 degrees do not exceed 3 degrees. The presence of the nitro group increases the C-C-C valence angle of ca 2.0-2.6 degrees, whereas an analogous effect associated with the nitramino group is much smaller (ca 0.3-1.3 degrees), pointing to its weak electron-withdrawing
与典型的仲硝胺相比,标题化合物的NNO 2基团相对于芳环的扭曲明显更少。酰胺氮是三角杂交的。硝基氨基几乎是平面的。CCNN扭转角在大约13度到42度之间变化,而沿着NN键的扭转小得多,大约在1度到15度之间。这些扭转角由晶体堆积控制,与纯N,4-二硝基苯胺的晶体相比,与由环丁砜形成的络合物相比,扭转角要大得多。芳环的内角与120度的偏差不超过3度。硝基的存在会增加CCC价角约2.0-2.6度,而与硝胺基团相关的类似作用要小得多(约0.3-1.3度),指出其弱的吸电子性能。硝基氨基基团没有显示与整个环上的电子要求取代基共轭的趋势。它仅作为氢键供体参与氢键。尽管硝胺重排是由酸催化的,但它不能作为质子受体。