In the present work we report the enantioselective recognition of water soluble stimuli-responsive polymers bearing phenylalanine moieties via host-guest interaction with β-cyclodextrin and randomly-methylated-β-cyclodextrin (RAMEB-CD). We synthesised N-acryloyl-D/L-phenylalanine monomers (2D, 2L) which were then copolymerised under free radical conditions with N-isopropylacrylamide (NIPAAm). The resulting copolymers 3D and 3L exhibit a lower critical solution temperature (LCST) of 25 °C. As a further benefit, the presence of a free carboxylic group in the copolymer system gives a high sensitivity to the pH value in respect to the LCST value. The enantioselective recognition of the side groups of copolymers 3D and 3L and their solubility behaviour were investigated by dynamic light scattering and 2D NMR spectroscopy, respectively.
在这项研究中,我们报告了
水溶性刺激响应
聚合物通过与β-
环糊精和随机
甲基化β-
环糊精(R
AMEB-CD)的宿主-客体相互作用实现对
苯丙
氨酸基团的对映选择性识别。我们合成了N-
丙烯酰-D/
L-苯丙氨酸单体(2D,2L),然后在自由基条件下与N-
异丙基丙烯酰胺(NIP
AAm)共聚合。所得的共聚物3D和3L表现出25°C的较低临界溶解温度(LC
ST)。作为进一步的好处,共聚物体系中的自由羧基的存在使其对pH值对LC
ST值的敏感性很高。通过动态光散射和二维核磁共振光谱技术分别研究了共聚物3D和3L的侧基的对映选择性识别和它们的溶解行为。