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Assembly of Co(II)/Cd(II) Coordination Polymers through a Mixed-Ligand Strategy: Structure; CO2 Chemical Fixation; and Oxidation of Sulfides
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DOI：10.1021/acs.cgd.5c01052.png)
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Abstract
En 中文
Four Co(II) coordination polymers (CPs) ({[Co4(L)4(2,6-PYDC)4(H2O)4]·H2O }n (1), {[Co2(L)2(1,4-BDC)(1,4-HBDC)Cl]·2H2O}n (2), [Co(L)(ntpa)H2O]n (3), [Co(L)(1,3,5-HTBC)]n (4)), two Cd(II) CPs ([Cd(L)(1,2,4-HTBC)]n (5), and [Cd(L)(1,4-NDC)]n (6)) (L = 4’-(4-(1H-1,2,4-triazol-1-yl)phenyl)-4,2’:6“,4”’-terpyridine; 2,6-H2PYDC: pyridine-2,6-dicarboxylic acid; 1,4-H2BDC: terephthalic acid; H2ntpa: 2-nitroterephthalic acid; 1,3,5-H3TBC: trimesic acid; 1,2,4-TBC: 1,2,4-benzenetricarboxylic acid; 1,4-H2NDC: 1,4-naphthalenedicarboxylic acid) were hydrothermally constructed by a mixed ligand strategy, showing one one-dimensional (1D) (1), two two-dimensional (2D) (2 and 4), and three three-dimensional (3D) (3, 5, and 6) structures. The crystal structures and catalytic activities of CPs 1–6 were studied in detail. Catalytic performance research indicated that CP 3 could efficiently catalyze the cyclization reaction of epoxides with CO2 in efficient yields. Moreover, the metal center of CP 5 interacts with the oxidant to generate active peroxo species, achieving efficient selective oxidation of sulfides. Importantly, CP 3 and CP 5 exhibited excellent reusability and retained structural stability and high catalytic activity after five cycles. Therefore, CP 3 and CP 5 have potential as efficient and stable heterogeneous catalysts.
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