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Issue 32, 2014
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Assembly and photocatalysis of two novel 3D Anderson-type polyoxometalate-based metal–organic frameworks constructed from isomeric bis(pyridylformyl)piperazine ligands

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Abstract

Two novel Anderson-type polyoxometalates (POMs)-based metal–organic frameworks (MOFs), namely, H{Cu22-OH)2L1[CrMo6(OH)6O18]}·4H2O (1), {Cu2L2[CrMoVI5MoV(OH)6O18](H2O)4}·4H2O (2) (L1 = N,N′-bis(3-pyridinecarboxamide)-piperazine, L2 = N,N′-bis(4-pyridinecarboxamide)-piperazine), are hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). In complex 1, the hexadentate [CrMo6(OH)6O18]3− polyoxoanion bridges the CuII ions to generate a 2D Cu–POM inorganic layer, which is further extended by the μ2-bridging L1 ligands (via ligation of pyridyl nitrogen atoms) to form a 3D MOF with a 4,6-connected {44·610·8}{44·62} topology. Complex 2 is also a 3D POM-based MOF exhibiting a {42·84} topology, which is constructed from the quadridentate [CrMoVI5MoV(OH)6O18]4− polyoxoanions and μ4-bridging L2 ligands (via ligation of pyridyl nitrogen and carbonyl oxygen atoms). The different coordination modes of POM polyanions and the isomeric bis(pyridylformyl)piperazine ligands play key roles in the construction of the title complexes. In addition, the photocatalytic activities of the title complexes on the degradation of methylene blue (MB) under UV, visible light and sunlight irradiation have been investigated in detail.

Graphical abstract: Assembly and photocatalysis of two novel 3D Anderson-type polyoxometalate-based metal–organic frameworks constructed from isomeric bis(pyridylformyl)piperazine ligands

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Publication details

The article was received on 25 Apr 2014, accepted on 06 Jun 2014 and first published on 06 Jun 2014


Article type: Paper
DOI: 10.1039/C4DT01211A
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2014,43, 12272-12278
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    Assembly and photocatalysis of two novel 3D Anderson-type polyoxometalate-based metal–organic frameworks constructed from isomeric bis(pyridylformyl)piperazine ligands

    X. Wang, Z. Chang, H. Lin, A. Tian, G. Liu and J. Zhang, Dalton Trans., 2014, 43, 12272
    DOI: 10.1039/C4DT01211A

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