Retinal Schiff bases with aromatic and aliphatic amino acids — the extremely different nature of the intramolecular hydrogen bond between the two types of compounds
作者:Bogumił Brzezinski、Jerzy Olejnik、Georg Zundel
DOI:10.1016/0022-2860(92)85017-b
日期:1992.7
all-trans retinal with aliphatic aminocarboxylic acids, as well as four with aromatic aminocarboxylic acids. Osmometric, FT-IR, UV and 1 H NMR measurements were performed. The intramolecular hydrogen bonds formed in the aliphaticcompounds always have the proton localized at the N-atom of the Schiff base, i.e. the structure O − ⋯H + N exists; conversely, with the aromaticcompounds the proton is always
摘要 我们研究了全反式视黄醛的四种席夫碱与脂肪族氨基羧酸以及四种与芳香族氨基羧酸的分子内氢键。进行了渗透压、FT-IR、UV 和 1 H NMR 测量。脂肪族化合物中形成的分子内氢键总是有质子定位在席夫碱的N原子上,即存在O-⋯H+N结构;相反,对于芳香族化合物,质子总是位于羧酸基团,即结构 OH⋯N 是唯一存在的。这一结果的解释是,芳香族化合物比脂肪族化合物具有更高的电子离域程度,因此席夫碱的 N 原子对前者更带正电。