Structure modulation from unstable to stable MOFs by regulating secondary N-donor ligands. Issue 39 (19th September 2018)

• Record Type: Journal Article
• Authors: Zhang, Da-Shuai; Zhang, Yong-Zheng; Gao, Jun; Liu, Hui-Ling; Hu, Hui; Geng, Long-Long; Zhang, Xiuling; Li, Yun-Wu
• Is Part Of: Dalton transactions. Volume 47:Issue 39(2018)
• Page Start: 14025
• Page End: 14032
• Publication Date: 2018-09-19
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt02858c
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Four new Cd/Zn(ii ) MOFs have been synthesized and structurally modulated from unstable to stable by regulating secondary N-donor ligands. Furthermore, YZ-10 shows excellent CO2 selective uptake over CH4 and N2 and uncommon H2 selective uptake over N2 at 77 K. Abstract : Four new Zn(ii )/Cd(ii )-based metal–organic frameworks (MOFs), namely {[Cd(tmdb)(bib)0.5 ]·solvents} n (YZ-7, YZ stands for the initials of the author Yong-Zheng Zhang), {[Cd(tmdb)(bmib)0.5 ]·solvents} n (YZ-8 ), {[Zn2 (tmdb)2 (bmib)]·solvents} n (YZ-9 ) and {[Zn2 (tmdb)2 (bmip)2 ]·solvents} n (YZ-10 ) have been solvothermally synthesized by using a semi-rigid ligand, 4, 4′-( H -1, 2, 4-triazol-1-yl)methylene-dibenzoic acid (H2 tmdb), and a series of secondary bis-imidazole ligands (bib = 1, 4-bis(1 H -imidazol-1-yl)benzene, bmib = 1, 4-bis(2-methyl-1 H -imidazol-1-yl)benzene, and bmip = 1, 3-bis(2-methyl-1 H -imidazol-1-yl)propane). By tuning the flexibility of the auxiliary ligands, these MOFs could be modulated from unstable (YZ-7–YZ-9 ) to stable (YZ-10 ) frameworks. Therefore, the gas adsorption properties ofYZ-10 are further studied. Interestingly, it shows excellent CO2 selective uptake over CH4 and N2 . At 298 K, both selectivities of CO2 /CH4 and CO2 /N2 show increasing trends and significantly reach 133.2 and 19.9 at 1 atm, respectively. Also, YZ-10 shows uncommon H2 selective uptake over N2 at 77 K. Moreover, the luminescence properties ofYZ-8–YZ-10 were studied in the solid state at room temperature.