离子液体作为毛细管气相色谱固定相的选择性和热稳定性是近年人们关注的课题.本文合成了 1-烯基-3-苄基咪唑-二(三氟甲基磺酰)亚胺盐(VBIm-NTf_2)离子液体并经毛细管柱内聚合制得了聚合离子液体PVBIm-NTf_2色谱柱.与VBIm-NTf_2色谱柱相比,PVBIm-NTf_2色谱柱具有良好的色谱选择性和热稳定性.PVBIm-NTf_2色谱柱对Grob试剂、醇混合物、酯混合物和苯系物等都表现了很好的分离能力,并且色谱峰峰形窄且对称.该聚合色谱柱在250 ℃下老化6 h后仍具有良好的分离能力和选择性.本文还测定了PVBIm-NTf_2的Abraham溶剂化参数,解析了该固定相与溶质间的相互作用,相关研究国内尚未见报道.研究表明,对常规离子液体进行柱内聚合是改善常规离子液体气相色谱固定相的热稳定性和选择性的有效途径.
The selectivity and thermal stability of ionic liquids as the stationary phases for capil-lary gas chromatography (CGC) have attracted much attention of researchers in recent years. In this study, 1-vinyl-3-benzyl imidazolium-bis(trifluoromethane-sulphonyl)imidate (VBIm-NTf_2) was synthesized and polymerized (PVBIm-NTf_2) in a CGC column. In comparison with VBIm-NTf_2, PVBIm-NTf_2 exhibits much better thermal stability and chromatographic selectivity, and achieves satisfactory resolution for Grob test mixture, alcohols mixture, esters mixture and ar-omatics mixture with narrow and symmetric peak shapes. The satisfactory resolution and selec-tivity of the polymerized column still remain after conditioned at 250 ℃ for 6 h. Additionally, the Abraham solvation parameters of PVBIm-NTf_2 were determined and the interactions between the stationary phase and solutes were elucidated. The present work demonstrates that the polymerization is an effective way to improve the selectivity and thermal stability of common ionic liquids as CGC stationary phases.
参考文献
| [1] | Anderson J L,Armstrong D W.Anal Chem,2003,75:4 851 |
| [2] | Anderson J L,Armstrong D W.Anal Chem,2005,77:6 453 |
| [3] | Qi M L,Armstrong D W.Anal Bioanal Chem,2007,388:889 |
| [4] | Yao C,Anderson J L.J Chromatogr A,2009,1 216:1 658 |
| [5] | Payagala T,Zhang Y,Wanigasekara E,et al.Anal Chem,2009,81:160 |
| [6] | Qiu H D,Hu Y Y,Liu X,et al.Chinese Journal of Chromatography (邱洪灯,胡云雁,刘霞,等.色谱),2007,25:293 |
| [7] | Zou Q L,Chen Z Q,Zheng J J,et al.Chemical Journal of Chinese Universities (邹巧莉,陈志强,郑京京,等.高等学校化学学报),2007,28:1 260 |
| [8] | Abraham M H.Chem Soc Rev,1993,22:73 |
| [9] | Abraham M H,Whiting G S.J Chromatogr,1992,594:229 |
| [10] | Abraham M H.J Chromatogr,1993,644:95 |
| [11] | Vitha M,Carr P W.J Chromatogr A,2006,1 126:143 |
| [12] | Poole C F,Poole S K.J Chromatogr A,2008,1 184:254 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%