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Issue 9, 2017
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Rigid versus semi-rigid bis(imidazole) ligands in the assembly of two Co(II) coordination polymers: structural variability, electrochemical properties and photocatalytic behavior

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Abstract

The hydrothermal reactions of 1,2,4,5-cyclohexanetetracarboxylic acid (H4L) with CoCl2·2H2O and rigid or semi-rigid bis(imidazole) ligands were able to generate two Co(II) coordination polymers (CPs), {[Co5(L)2(1,4-bimb)(μ3-OH)2(H2O)8]·2H2O}n (1), {[Co(L)0.5(1,4-bib)]·H2O}n (2) (1,4-bimb = 1,4-bis(imidazol-1-ylmethyl)benzene, 1,4-bib = 1,4-bis(1H-imidazol-1-yl)benzene). CPs 1 and 2 were structurally characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction and single crystal X-ray diffraction. CP 1 features a 3D 3,3,4,4,5-connected framework with an unprecedented {42·8·102·12}{43·6·86}2{43}2{46}2{62·8}2 topology, which represents the first example of CPs with such a topology. CP 2 possesses a three-fold interpenetration 3D framework with mog topology. The distinct structures of the two CPs may result from diverse coordination modes of the (L)4− ligands and different structural characteristics of rigid or semi-rigid N-donor ligands. The thermal stabilities, photoluminescence properties and electrochemical behavior in the solid state for CPs 1 and 2 have been investigated. The photophysical studies indicated that CPs 1 and 2 are potential semiconductive materials. Moreover, both CPs 1 and 2 show high photocatalytic efficiency for the degradation of methylene blue (MB) under UV light irradiation and exhibit good stability and recyclability. A possible photocatalytic mechanism is speculated by introducing t-butyl alcohol (TBA) as a widely used ˙OH scavenger.

Graphical abstract: Rigid versus semi-rigid bis(imidazole) ligands in the assembly of two Co(ii) coordination polymers: structural variability, electrochemical properties and photocatalytic behavior

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Publication details

The article was received on 07 Dec 2016, accepted on 31 Jan 2017 and first published on 31 Jan 2017


Article type: Paper
DOI: 10.1039/C6DT04626F
Citation: Dalton Trans., 2017,46, 2892-2903
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    Rigid versus semi-rigid bis(imidazole) ligands in the assembly of two Co(II) coordination polymers: structural variability, electrochemical properties and photocatalytic behavior

    J. Cui, S. Hou, K. Van Hecke and G. Cui, Dalton Trans., 2017, 46, 2892
    DOI: 10.1039/C6DT04626F

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