Conformational preferences in 2-nitrophenylthiolates: interplay between intra- and intermolecular forces; structures of (<i>E</i>)-1-(4-methyl-2-nitrobenzenethiolato)-2-phenylethene, <i>S</i>-(2-nitrophenyl)benzenecarbothiolate and 1-(2-nitrophenylthio)-2,5-pyrrolidinedione
作者:John N. Low、Emily J. Storey、Mary McCarron、James L. Wardell、George Ferguson、Christopher Glidewell
DOI:10.1107/s0108768199009702
日期:2000.2.1
The conformations of these molecules have been investigated by SCF calculations and two energy minima have been identified for each: the molecules of (1) and (3) adopt conformations in their crystals which are close to those at the overall energy minima calculated for isolated molecules, while molecules of (2) adopt a conformation in the crystal close to that calculated for the local energy minimum
在(E)-1-(4-甲基-2-硝基苯硫醇基)-2-苯基乙烯(C15H13NO2S(1)(斜方体Pbca))中,硝基基团与相邻的芳基环几乎共面,但硝基-硝基之间的二面角芳基和苯乙烯基片段约为121度。分子通过成环的成对的CH ... O氢键连接。在S-(2-硝基苯基)苯硫代碳酸盐C13H9NO3S(2)(单斜晶P2(1)/ a)中,硝基旋转33.0(2)度,脱离相邻的芳基环平面,硫代苯甲酸酯基团很强扭转远离二取代的芳基环的平面。(2)的分子通过C-H ... O氢键连接成链,每条链通过芳香pi ... pi堆积相互作用连接到两个相邻的链上。在1-(2-硝基苯硫基)-2,5-吡咯烷二酮中 C10H8N2O4S(3)(单斜晶系P2(1)/ a),硝基再次与相邻的芳基环几乎共面,但吡咯烷二酮单元几乎与O2NC6H4SN平面正交。结构中存在三种类型的CH ... O氢键,它们将分子连接成二维网络。这