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Issue 34, 2017
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Structural diversity and catalytic properties of five Co2(COO)4 cluster-based coordination polymers modified with R-isophthalic acid (R = H, NO2, CH3, OH and tBu)

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Abstract

The self-assembly of 5-substituted isophthalic acid (R-H2BDC, R = H, –NO2, –CH3, –OH and –tBu), CoII ions and 2,4,6-tris(4-pyridyl)-1,3,5-triazine (TPT) under solvothermal conditions yielded five Co-based coordination polymers (CPs): {[Co(BDC)(TPT)]·0.5(H2O)}n (CP1), {[Co(NO2-BDC)(TPT)]·H2O}n (CP2), {[Co(CH3-BDC)(TPT)]·0.5H2O}n (CP3), {[Co(HO-BDC)(TPT)]·0.5H2O}n (CP4), and {[Co(tBu-BDC)(TPT)2/3]·(CH3CH2OH)(H2O)}n (CP5) (H2BDC = isophthalic acid, NO2-BDC = 5-nitroisophthalic acid, CH3-BDC = 5-methylisophthalic acid, OH-BDC = 5-hydroxyisophthalic acid and tBu-BDC = 5-tert-butylisophthalic acid). All compounds comprise Co2(COO)4 binuclear units, which are connected via a combination of R-H2BDC and TPT ligands. In CP1, the binuclear Co2(COO)4 units are bridged into 1D chains extending along the [1 1 0] and [−1 1 0] directions, which are further interlinked by TPT ligands into a 3D network with CdS net topology. CP2, CP3 and CP4 are iso-structural and all exhibit 3D frameworks with pcu (α-Po) topology. In CP5, the Co2(COO)4 units are firstly linked into a 3D NbO net viatBu-BDC ligands, which are further accommodated by size-matching trigonal TPT ligands into a novel (3,8)-connected 3D net. Catalytic measurements show that CP2 and CP3 are good catalysts for the Knoevenagel condensation reaction of benzaldehyde with ethyl cyanoacetate, exhibiting conversions of 91.3% and 96.6% in 120 min, respectively, compared with the other present compounds. In addition, CP2 and CP5 exhibit highly efficient catalytic properties for the selective epoxidation of styrene.

Graphical abstract: Structural diversity and catalytic properties of five Co2(COO)4 cluster-based coordination polymers modified with R-isophthalic acid (R = H, NO2, CH3, OH and tBu)

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Publication details

The article was received on 13 Jun 2017, accepted on 20 Jul 2017 and first published on 20 Jul 2017


Article type: Paper
DOI: 10.1039/C7CE01100H
Citation: CrystEngComm, 2017,19, 5038-5047
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    Structural diversity and catalytic properties of five Co2(COO)4 cluster-based coordination polymers modified with R-isophthalic acid (R = H, NO2, CH3, OH and tBu)

    J. Zhang, J. Shi, P. Cui, Z. Yao and W. Deng, CrystEngComm, 2017, 19, 5038
    DOI: 10.1039/C7CE01100H

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