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Type: Journal article
Title: Utilising hinged ligands in MOF synthesis: a covalent linking strategy for forming 3D MOFs
Author: Coghlan, C.
Sumby, C.
Doonan, C.
Citation: CrystEngComm, 2014; 16(28):6364-6371
Publisher: Royal Society of Chemistry
Issue Date: 2014
ISSN: 1466-8033
Statement of
Campbell J. Coghlan, Christopher J. Sumby and Christian J. Doonan
Abstract: Here we show that connecting two equivalents of a bis-pyrazolymethane ‘hinged’ link by a carbon–carbon bond characteristically ‘extends’ the 2D layered metal–organic frameworks (MOFs) typically formed with such compounds into 3D MOF materials. 1,1,2,2-Tetrakis[4-(4-carboxyphenyl)-1H-pyrazol-1-yl]ethane (L) was prepared in three steps and upon reaction with late transition metals, namely copper(II), cadmium(II) and zinc(II), gave 3D MOFs [Cu2(L)(H2O)2] 1.4DMF and [M2L]·xDMF (M = Zn, x = 1; M = Cd, x = 1.75). The 3D MOFs display gating behaviour in their adsorption isotherms, consistent with 3rd generation flexible structures. Furthermore, the 3D MOFs showed appreciable affinity for CO2 at 293 K however, due to the larger pore sizes, molecular sieving of CO2/N2 was not observed. Reaction of L with cobalt(II) gave a 3D hydrogen-bonded network incorporating 1D coordination polymer chains that is topologically equivalent to the Zn and Cd MOFs. The strategy outlined here demonstrates a novel route for designing more chemically and thermally robust 3D MOFs from 2D layered materials.
Description: First published online 04 Mar 2014
Rights: This journal is © The Royal Society of Chemistry 2014
DOI: 10.1039/C4CE00181H
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