我们报告了合成后的修饰,用于制备新型手性荧光共价有机框架(COF),以选择性识别咪唑咪唑对映体。在这项研究中,首先通过2,5-二羟基对苯二甲醛(Dha)和1,3,5-三(4-氨基苯基)苯(Tab)之间的席夫碱反应合成了手性COF,然后使用(1S)-()-10-樟脑磺酰氯作为手性改性剂进行亲核取代。所得的规则球形手性COFDhaTab不仅具有较高的光学效率,强共价键结构,良好的结晶度,比表面积大,但在五种农药对映体(S/R-imazamox,乙酰甲胺磷,乙草胺,丙草胺和甲霜灵)。S-和R-imazamox的检出限分别为4.20μmol/L和3.03μmol/L,分别。同时,对映体的过量值(5.30%)表明,手性COFDhaTab对咪唑咪唑的对映体具有很强的吸附能力,对R-咪唑的亲和力更高。这种手性荧光COF为对映体的辨认开辟了一条新的门路。
We report a post-synthesis modification for the preparation of a novel chiral fluorescent covalent organic framework (COF) for selective recognization of
imazamox enantiomers. In this study, chiral COF was firstly synthesized via a Schiff-base reaction between 2,5-dihydroxyterephthalaldehyde (Dha) and 1,3,5-tris(4-aminophenyl)benzene (Tab) followed by a nucleophilic substitution using (1S)-(+)-10-camphorsulfonyl chloride as chiral modifier. The resulting regular spherical chiral COF Dha Tab not only presented the high optical efficiency, strong covalent bond structure, good crystallinity, large specific surface area but also showed the specific enantioselectivity and quick identification for
imazamox enantiomers among five pesticide enantiomers (S/R-
imazamox, acephate, acetochlor, propisochlor and metalaxyl). The detection limits for S- and R-
imazamox were 4.20 μmol/L and 3.03 μmol/L, respectively. Meanwhile, the enantiomeric excess value (5.30 %) manifested that the chiral COF Dha Tab had the strong adsorption ability to imazamox enantiomers and more higher affinity for R-
imazamox. This chiral fluorescent COF opened up a new way for the recognition of enantiomers.