<sup>19</sup>F NMR Characterization of the Encapsulation of Emerging Perfluoroethercarboxylic Acids by Cyclodextrins
作者:Mary Jo Weiss-Errico、Ion Ghiviriga、Kevin E. O’Shea
DOI:10.1021/acs.jpcb.7b05901
日期:2017.9.7
recently been detected in the environment. Cyclodextrins (CDs) have been proposed as agents for the remediation of problematic pollutants, including legacy PFASs. The current study uses 19F NMR spectroscopy to measure the complexation of mono-, di-, and triether PFECAs by CDs for eventual environmental applications. Eight PFECAs were characterized by 19F and 13C NMR. The change in chemical shift of individual
传统的全氟烷基物质(PFAS)是已知的环境污染物,会对健康产生严重的不利影响。全氟醚羧酸(PFECAs)是新兴的PFAS,现在已取代了传统的PFAS,最近在环境中发现了这种新的PFAS。环糊精(CDs)已被提议作为补救有问题的污染物(包括传统的PFAS)的试剂。当前的研究使用19 F NMR光谱来测量CD的单醚,二醚和三醚PFECA的络合,最终用于环境应用。八个PFECA的特征是19 F和131 H NMR。当CD以各种化学计量比络合时,各个氟的化学位移变化可用于确定主体与客体的缔合常数。所有研究的PFECA都被β-CD最强地封装,其缔合常数为10 2 –10 5 M –1,具体取决于链长和醚官能度的数量。19楼– 1对两个支链单醚PFPrOPrA(“ GenX”)和PFDMMOBA的β-CD配合物进行了H杂核Overhauser效应光谱(HOESY)NMR实验,以阐明该配合物的结构细节,