Preferential deprotonation and conformational stability of dicarboxylic acids: A packing effect
作者:Nilotpal Barooah、W. Marjit Singh、Jubaraj B. Baruah
DOI:10.1016/j.molstruc.2007.05.008
日期:2008.3
that the solid state structure of 1,10-phenanthrolinium salt of 2 has deprotonation at the aromatic end, whereas in 8-hydroxy-quinolinium salt of 2 is formed by deprotonation of carboxylic acid group on the aliphatic side. The dicarboxylic acid 2 forms 1:2 co-crystals with quinoline. From crystallographic study it is shown that the weak interactions become prominent in stabilising the observed conformers
摘要 (6-carboxymethyl-1,3,5,7-tetraoxo-3,5,6,7-tetrahydro-1 H-pyrrolo[3,4-f]isoindol-2-yl 的一系列盐的晶体结构)-乙酸(1)和2-羧甲基-1,3-二氧-2,3-二氢-1H-异吲哚-5-羧酸(2)与不同多核含氮杂环化合物,即喹啉、1,10测定-菲咯啉和8-羟基喹啉。在 1 与喹啉鎓和 1,10-菲啉鎓阳离子的盐的情况下,观察到羧酸根阴离子和羧酸基团之间的顺式配置;而在 1 的 8-羟基喹啉盐的情况下,它是反处置。还发现2的1,10-菲啉盐的固态结构在芳香端发生去质子化,而在 8-羟基喹啉盐中 2 是通过脂肪族侧的羧酸基团的去质子化形成的。二元羧酸 2 与喹啉形成 1:2 共晶。晶体学研究表明,弱相互作用在稳定观察到的构象异构体和稳定特定的去质子物质方面变得突出。