Jump to main content
Jump to site search

Issue 10, 2019
Previous Article Next Article

Co(II)-cluster-based metal–organic frameworks as efficient heterogeneous catalysts for selective oxidation of arylalkanes

Author affiliations

Abstract

To explore metal–organic frameworks (MOFs) based on Co-clusters as heterogeneous catalysts to selectively catalyze the reaction of C–H bond oxidation of aromatic alkanes to their corresponding ketones, three MOFs {[Co5(pmbcd)23-OH)2(H2O)4(DMF)2]·4DMF}n (MOF 1), {[Co2(pmbcd)(bpea)2]·2H2O·2DMF}n (MOF 2), and {[Co2(pmbcd)(dpp)2]·3H2O·2DMF}n (MOF 3) (H4pmbcd = 9,9′-(1,4-phenylenebis(methylene))bis(9H-carbazole-3,6-dicarboxylic acid), bpea = 1,2-bis(4-pyridyl)ethane, dpp = 1,3-di(4-pyridyl)propane) were successfully synthesized and structurally characterized. MOF 1 was constructed from a pentanuclear Co(II) cluster and exhibited a porous framework with channels of 8 × 10 Å2 along the b axis. MOF 2 was constructed from [Co2(CO2)4] units and presented a porous three-dimensional (3D) framework with channels of 11 × 13 Å2 along the b axis and of 10 × 12 Å2 along the c axis. MOF 3 was a flat two-dimensional (2D) layer based on binuclear Co(II) units when dpp as an auxiliary ligand was introduced. The Co5-cluster-based MOF 1 exhibited excellent catalytic activity for the direct C–H bond activation of arylalkanes to ketones in H2O under room temperature because of its high density of Lewis acidic sites within the frameworks and suitable channel size to access the catalytic sites. It also presented the spatial confinement effect and catalyzed the reaction with high regioselectivity, forming mono-ketones as the sole products. Easy product separation, simple reaction procedures, and recyclability of these catalysts make the catalytic system attractive. Our work highlights the superiority of the MOF-based materials as heterogeneous catalysts.

Graphical abstract: Co(ii)-cluster-based metal–organic frameworks as efficient heterogeneous catalysts for selective oxidation of arylalkanes

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Dec 2018, accepted on 01 Feb 2019 and first published on 05 Feb 2019


Article type: Paper
DOI: 10.1039/C8CE02151A
Citation: CrystEngComm, 2019,21, 1666-1673

  •   Request permissions

    Co(II)-cluster-based metal–organic frameworks as efficient heterogeneous catalysts for selective oxidation of arylalkanes

    Y. Fan, X. Li, K. Gao, Y. Liu, X. Meng, J. Wu and H. Hou, CrystEngComm, 2019, 21, 1666
    DOI: 10.1039/C8CE02151A

Search articles by author

Spotlight

Advertisements