Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (10): 819-824.DOI: 10.6023/A16070349 Previous Articles     Next Articles



胡聪, 李丽, 杨娜, 张紫恒, 谢生明, 袁黎明   

  1. 云南师范大学化学化工学院 昆明 650500
  • 投稿日期:2016-07-16 发布日期:2016-09-18
  • 通讯作者: 谢生明,;Tel.:0871-65941088;Fax:0871-65941088;袁黎明,;Tel.:0871-65941088;Fax:0871-65941088;
  • 基金资助:


Chiral Metal-Organic Framework [Cu(S-mal)(bpy)]n Used for Separation of Racemates in High Performance Liquid Chromatography

Hu Cong, Li Li, Yang Na, Zhang Ziheng, Xie Shengming, Yuan Liming   

  1. Faculty of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500
  • Received:2016-07-16 Published:2016-09-18
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21275126, 21365024) and the Yunnan Province's Basic Research Project (No. 2013FB035).

Chiral metal-organic framework materials, as a new type of porous materials, have attracted much attention in the field of chiral separation. In this paper, a homochiral MOF [Cu(S-mal)(bpy)]n with 3D chiral networks was synthesized by the reaction of ligands (S-malic acid and 4,4'-bipyridine) with copper acetate via a solvothermal method. A packed chiral column for high performance liquid chromatography was fabricated using [Cu(S-mal)(bpy)]n as stationary phase. Before the packing, the MOF crystals was crushed in ethanol applying soft pressure and then the MOF with suitable particle size (5~10 m) was obtained via solvent suspension. A 4.2 g mass of prepared MOF was suspended in a mixture of hexane and isopropanol. In order to control the packing quality, the suspension of MOF was packed into a stainless steel empty column (25 cm long×4.6 mm i.d.) under 40 MPa using hexane/isopropanol (9:1, V/V) as the slurry solvent according to a conventional high pressure slurry packing procedure. To investigate the chiral recognition ability of this stationary phase, a series of racemic compounds were separated on the chiral MOF column using different ratio of n-hexane/isopropanol as mobile phase. The results showed that the chiral column exhibited good resolving ability towards 17 racemates, including alcohols, ketones, flavonoids, phenols and amines. For instance, the resolution value of 1-(1-naphthyl)ethanol could reach 4.5. Compared with three kinds of homochiral MOFs columns previously reported by our group, this column showed better chiral recognition ability and higher resolution toward racemates, and has a good complementary for chiral separation. The [Cu(S-mal)(bpy)]n possesses cavities with average dimensions (5 Å×5 Å×6 Å), which were interconnected by narrow windows with diameter ≤3 Å. Therefore, the chiral recognition mostly depends on the surface of the MOF crystal in which the steric fit between the chiral networks and conformation of the solute molecule is the main interactive force. Besides, many other interactions such as the hydro-gen-bondings, dispersion forces, dipole-dipole interaction, and π-π interactions which come from the solutes, chiral stationary phase and the mobile phase may also play some role. The reproducibility and stability of the chiral column were evaluated. The results showed that the chiral column showed good reproducibility and stability for enantioseparation.

Key words: metal-organic framework, high performance liquid chromatography, S-malic acid, chiral separation