designed and synthesized. Crystal structure and 1H–1H NOESY experiments demonstrate that the oligomers adopt stable helical conformation, which are induced by C5–H···X–C (X = F, Cl) intramolecular hydrogen bonding between triazole protons and halogen atoms. The stabilities of the folded conformations are confirmed by DFT calculations, which show that each C5–H···F–C planar interaction lowers the energy
                                    设计合成了基于4-
氟苯甲酸异丁酯和4-
氯苯甲酸异丁酯的芳基三唑低聚物。晶体结构和1 H– 1 H NOESY实验表明,低聚物具有稳定的螺旋构象,这是由三唑质子和卤素原子之间的C 5 –H··X–C(X = F,Cl)分子内氢键诱导的。折叠构象的稳定性通过DFT计算得到了证实,DFT计算表明,每一个C 5 –H···F–C平面相互作用都会使能量平均降低〜3 kcal mol –1,而当降低时,能量降低〜1 kcal mol –1。 C 5形成–H···Cl–C桥。氢键网络在竞争性氢键介质(如
DMSO)中被破坏,生成未折叠的低聚物。