A flexible metal–organic framework with adaptive pores for high column-capacity gas chromatographic separation. Issue 11 (7th September 2018)

• Record Type: Journal Article
• Authors: He, Chun-Ting; Ye, Zi-Ming; Xu, Yan-Tong; Xie, Yi; Lian, Xin-Lu; Zhang, Jie-Peng; Chen, Xiao-Ming
• Is Part Of: Inorganic chemistry frontiers. Volume 5:Issue 11(2018)
• Page Start: 2777
• Page End: 2783
• Publication Date: 2018-09-07
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8qi00684a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : A new zinc pyrazolyl-carboxylate framework with multi-mode and adaptive flexibility has been synthesized for efficient gas chromatographic separations. Abstract : Solvothermal reaction of Zn(NO3 )2 and a bifunctional ligand 4-(3, 5-dimethyl-1 H -pyrazol-4-yl)benzoic acid (H2 mpba) using benzene as template gave a two-fold interpenetrated porous framework [Zn2 (Hmpba)2 (mpba)]·2C6 H6 (1 ·C6 H6 or MCF-54), which displayed single-crystal to single-crystal (SCSC) structural transformations upon activation and adsorption of methanol, toluene and cyclohexane. Single-crystal structural analysis and computational simulations demonstrated that compound1 possesses adaptive pores toward various shapes or arrangements of guests. Using silicone rubber as binder, microcrystalline powders of1 were coated on the inner surface of a capillary column for gas chromatography, which displayed high separation performances and/or abnormal separation sequences for similar benzene homologues. By virtue of the large loading amount of adsorbent, the column shows extra-large column-capacity, being almost 300 times larger than that of common commercial capillary columns, leading to good selectivities and resolutions even in the presence of large amount of interferents.