3‐dimethyl‐3,5‐dihydro‐4H‐imidazol‐4‐one (o‐ABDI) as the core chromophore with a seven‐membered‐ring N−H‐type intramolecular hydrogen bond have been synthesized and characterized. The acidity of the N−H proton and thus the hydrogen‐bond strength can be fine‐tuned by replacing one of the amino hydrogen atoms by a substituent R, the acidity increasing with increasing electron‐withdrawing strength of R, that
                                    一系列含有5-(2-
氨基亚苄基)-2,3-二甲基-3,5-二氢-4 H-
咪唑-4-酮(o - ABDI)作为核心生色团的化合物,带有七元环N -H型分子内氢键已经合成并表征。NH质子的酸度和氢键强度可以通过用取代基R取代一个
氨基氢原子来进行微调,酸度随R的吸电子强度的增加而增加,即顺序H