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Issue 15, 2012
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The multifunctional roles of the ionic liquid [Bmim][BF4] in the creation of cadmium metal–organic frameworks

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Abstract

This work addresses the application of ionic liquid [Bmim][BF4] with multiple functions, including as a solvent, structure-directing agent, fluoride source and catalyst promoter, for the creation of F-center Cd3F metal–organic frameworks (MOFs) via an in situ ionothermal oxidation and hydrolysis process. We thus report the syntheses, structures and characterizations of three novel three-dimensional MOFs based on the Cd3F cluster, namely, [Cd3F(ina)4(4-pic)3]·BF4 (1), [Cd3F(ina)3(4,4′-bpy)2(4-pic)2]·2BF4·(4,4′-bpy)·2H2O (2) and [Cd3F(ina)3(4,4′-bpy)3]·2BF4·(4,4′-bpy)·2H2O (3) (ina = isonicotinate, 4,4′-bpy = 4,4′-bipyridine, 4-pic = 4-methylpyridine), in which the ina ligand was produced in situ from ligand precursors, such as 4-pic and 4,4′-bpy. Compounds 1, 2 and 3 present cationic frameworks, in which the BF4 anions and the guest molecules, including the non-coordinating 4,4′-bpy and the lattice water, fill in the holes and/or channels. A thermal analysis shows that 1–3 are stable up to 200 °C. A study on the luminescence property indicates that 1–3 exhibit strong emission bands in the blue region. The current study opens an avenue for the use of ionic liquids in the formation of crystalline materials.

Graphical abstract: The multifunctional roles of the ionic liquid [Bmim][BF4] in the creation of cadmium metal–organic frameworks

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Publication details

The article was received on 07 Feb 2012, accepted on 04 Apr 2012 and first published on 04 Apr 2012


Article type: Paper
DOI: 10.1039/C2CE25169H
CrystEngComm, 2012,14, 4894-4901

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    The multifunctional roles of the ionic liquid [Bmim][BF4] in the creation of cadmium metal–organic frameworks

    Z. Xie, M. Feng, B. Tan and X. Huang, CrystEngComm, 2012, 14, 4894
    DOI: 10.1039/C2CE25169H

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