Issue 43, 2021

Structures and catalytic oxidative coupling reaction of four Co-MOFs modified with R-isophthalic acid (R[double bond, length as m-dash]H, OH and COOH) and trigonal ligands

Abstract

In this paper, we present four Co-MOFs using R-substituted isophthalic acid (R-H2BDC, R = H, OH and COOH) along with trigonal n-TBT (n = 3 or 4) as organic ligands. These Co-MOFs are formulated as {[Co(1,3-BDC)(4-TBT)2/3]·(H2O)(DMF)1.5}n (Co-MOF-1), {[Co(HO-BDC)(4-TBT)]·(EtOH)2(DMF)2}n (Co-MOF-2), {[Co(HO-BDC)(4-TBT)2/3]·(H2O)3(MeOH)3(DMA)}n (Co-MOF-3) and {[Co3(BTC)2(3-TBT)2(H2O)2]·(H2O)2(EtOH)5(DMA)1.5}n (Co-MOF-4), where H2BDC = isophthalic acid, OH–H2BDC = 5-hydroxyisophthalic acid and H3BTC = 1,3,5-tricarboxybenzene, 4-TBT = 1,3,5- tris(4-pyridyl)benzene and 3-TBT = 1,3,5-tris(3-pyridyl)benzene. Co-MOF-1, 2 and 3 are constructed from the dimeric Co2(COO)2 unit and exhibit 3D frameworks. In Co-MOF-4, the dimeric Co2(COO)2 unit and single nuclear CoII center are connected by BTC3− and 3-TBT ligands into a 3D network. The catalytic experiments revealed that four Co-MOFs can catalyze the oxidative coupling reaction of benzyl alcohols and aniline to imines with good to excellent conversions under solvent-free conditions and an air atmosphere. Co-MOF-4 exhibited the best catalytic performance and the catalyst could be reused for at least five cycles without losing its structural integrity and catalytic activity.

Graphical abstract: Structures and catalytic oxidative coupling reaction of four Co-MOFs modified with R-isophthalic acid (R [[double bond, length as m-dash]] H, OH and COOH) and trigonal ligands

Supplementary files

Article information

Article type
Paper
Submitted
10 सितम्बर 2021
Accepted
22 सितम्बर 2021
First published
22 सितम्बर 2021

CrystEngComm, 2021,23, 7590-7601

Structures and catalytic oxidative coupling reaction of four Co-MOFs modified with R-isophthalic acid (R[double bond, length as m-dash]H, OH and COOH) and trigonal ligands

Q. Liu, L. Zhang, Y. Bao, N. Zhang, J. Zhang, Y. Xing, W. Deng and Z. Liu, CrystEngComm, 2021, 23, 7590 DOI: 10.1039/D1CE01221E

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