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Novel Mn(II)-Based Metal–Organic Frameworks Isolated in Ionic Liquids

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posted on 06.03.2013, 00:00 authored by Ling Xu, Young-Uk Kwon, Baltazar de Castro, Luís Cunha-Silva
An unprecedented series of Mn2+-based metal–organic framework (MOF) materials prepared and isolated in ionic liquids (ILs) is reported. Ionothermal reactions of Mn­(OAc)2 with H3btc (benzene-1,3,5-tricarboxylic acid) in two groups of [rmi]­X (rmi = 1-alkyl-3-methylimidazolium; r = ethyl or propyl, X = Cl, Br, or I) ILs produced three slightly different 3D MOFs formulated as [rmi]­[Mn­(btc)] [r = ethyl (1), propyl (2), and (3)], whose architectures can be envisaged as (3,6)-connected pyr topological nets. Compounds 13 are the preferred products when the metal center is half filled d-shelled Mn with the cations of ILs being [emi]+ or [pmi]+. The comparison of the ionothermal synthesized M-btc systems suggests a significant combinatorial influence of metal-direction and ILs’ cationic template, contrasting with subtle effect of ILs’ halides on the MOF structures.

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