Molecular structures and hydrogen bonding in the crystalline hydrates of two flexible double betaines with different quarternary ammonio groups in the adipic acid skeleton
作者:De-Dong Wu、Thomas C.W. Mak
DOI:10.1016/s0166-1280(05)80011-9
日期:1995.12
Crystalline dihydrates of two flexible double betaines −O2CCH(R)CH2CH2CH(R)CO2− (1, R = Me3N+, 2, R = C5H5N+) have been characterized by single-crystal X-ray analysis. Both compounds crystallize in the monoclinic space group P21/c with a = 7.463(4), b = 10.312(6), c = 9.978(5) Å, β = 90.18(5)°, Z = 2 for 1·2H2O and a = 9.063(2), b = 7.665(1), c = 11.962(1) Å, β = 94.89(1)°, Z = 2 for 2·2H2O. Both betaine
两个柔性双甜菜碱的结晶二水合物- Ö 2 CCH(R)CH 2 CH 2 CH(R)CO 2 - (1,R =我3 Ñ +,2,R = C 5 H ^ 5 Ñ +)的特点是单晶X射线分析。两种化合物均在单斜空间群P 2 1 / c中结晶,其中a = 7.463(4),b = 10.312(6),c = 9.978(5)Å,β = 90.18(5)°,Z = 21 ·2H 2 O,且a = 9.063(2),b = 7.665(1),c = 11.962(1)Å,β = 94.89(1)°,对于2 ·2H 2 O ,Z = 2。两个甜菜碱分子均占据1′位,但是在羧酸酯基团和铵基团的取向方面有所不同。在每个晶体结构中,从水分子到相邻羧酸酯基团的供体氢键的形成产生了一个无限的二维网络,该网络由相同的26元环的堆积组成。