Issue 46, 2014

The influence of 1-alkyl-3-methyl imidazolium ionic liquids on a series of cobalt-1,4-benzenedicarboxylate metal–organic frameworks

Abstract

To investigate the influence of ionic liquids on the structures and properties of the complexes, ionothermal synthesis of 1,4-benzenedicarboxylate acid (H2BDC) reacting with Co(NO3)2 with four different 1-alkyl-3-methylimidazolium bromides produced three layered metal–organic frameworks with the chemical formula [RMI]2[Co3(BDC)3Br2], (R = ethyl for 1; n-propyl for 2, and n-butyl for 3; MI = imidazolium) and a 3D architecture [AMI]2[Co3(BDC)4] (4) (A = amyl). Compounds 1–3 have the same (3,6) skeleton with [RMI]+ cations located in the interlayer space. Compound 4 grows into a 3D architecture based on BDC2− ligands linking similar 2D grids as those in 1–3. The [RMI]+ templates exert their influence on the diagonal sizes of the quadrilateral grids, the interlamellar spacing, and the solvent-accessible cavities through steric hindrance. By comparison of 1–3, the [RMI]+ templates also have an effect on the properties. As the alkyl chains in [RMI]+ increase, the decomposing temperatures increase, emission peaks around 400 nm blue shift, and the cavities of 1–3 decrease. 1–3 exhibit ferromagnetism with similar magnetic parameters, while 4 reveals antiferromagnetism.

Graphical abstract: The influence of 1-alkyl-3-methyl imidazolium ionic liquids on a series of cobalt-1,4-benzenedicarboxylate metal–organic frameworks

Supplementary files

Article information

Article type
Paper
Submitted
21 Aug 2014
Accepted
04 Oct 2014
First published
06 Oct 2014

CrystEngComm, 2014,16, 10649-10657

Author version available

The influence of 1-alkyl-3-methyl imidazolium ionic liquids on a series of cobalt-1,4-benzenedicarboxylate metal–organic frameworks

L. Xu, B. Liu, S. Liu, H. Jiao, B. de Castro and L. Cunha-Silva, CrystEngComm, 2014, 16, 10649 DOI: 10.1039/C4CE01722F

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