作者:Joseph M. Griffin、John H. Atherton、Michael I. Page
DOI:10.1021/acs.joc.5b00830
日期:2015.7.17
Perfluorinated long chain alkyl amides aggregate in liquid ammonia with increasing concentration which reflects micelle-type formation based on changes in 19F NMR chemical shifts. The critical micelle concentrations (cmc) decrease with increasing chain length and give Kleven parameters A = 0.18 and B = 0.19. The micelles catalyze the ammonolysis of esters in liquid ammonia. The corresponding perfluorinated long
全氟化长链烷基酰胺在液氨中聚集,浓度增加,这反映了基于19 F NMR化学位移的变化而形成的胶束类型。临界胶束浓度(cmc)随着链长的增加而降低,并给出Kleven参数A = 0.18和B = 0.19。胶束催化液氨中酯的氨解。相应的全氟化长链烷基羧酸盐在液氨中形成离子对,但平衡解离常数表明除静电力外,链之间的相互作用也很有利。这些全氟化的羧酸盐在水溶液中形成胶束,并且它们的cmc产生Kleven B值= 0.52,而类似的烷基羧酸盐为0.30。讨论了CH 2和CF 2单元在水和液氨中的疏水性差异,以及与液氨中生命形式的可能相关性。