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The impact of N,N?-ditopic ligand length and geometry on the structures of zinc-based mixed-linker metal–organic frameworks

Burrows, Andrew D., Chan, Siobhan, Gee, William J., Mahon, Mary F., Richardson, Christopher, Sebestyen, Viorica M., Turski, Domenyk, Warren, Mark R. (2017) The impact of N,N?-ditopic ligand length and geometry on the structures of zinc-based mixed-linker metal–organic frameworks. CrystEngComm, 19 (37). pp. 5549-5557. ISSN 1466-8033. (doi:10.1039/c7ce01447c) (KAR id:63655)

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Abstract

Combining Zn(NO3)2·6H2O with a series of dicarboxylic acids in the presence of the N,N?-ditopic ligand di(4-pyridyl)-1H-pyrazole (Hdpp) results in a series of mixed-linker metal–organic frameworks (MOFs) that have been crystallographically characterised. The reaction with 1,4-benzenedicarboxylic acid (H2bdc) gives [Zn2(bdc)2(Hdpp)2]·2DMF 1, which shows Zn2(?-carboxylate)2(carboxylate)2 secondary building units (SBUs) linked by bdc ligands into sheets, and these are pillared by the Hdpp linkers into a doubly-interpenetrated three-dimensional network. The reaction with 1,4-naphthalene dicarboxylic acid (H2ndc-1,4) gives two products: [Zn2(1,4-ndc)2(Hdpp)]·4DMF 2a forms a three-dimensional network in which sheets, formed from Zn2(carboxylate)4 ‘paddle-wheel’ SBUs being linked by 1,4-ndc, are connected together by Hdpp pillars, whereas [Zn(1,4-ndc)(Hdpp)]·DMF 2b forms a fourfold interpenetrated structure based on diamondoid networks with single zinc centres as nodes. The reaction with 1,3-benzenedicarboxylic acid (H2mbdc) produces [Zn(mbdc)(Hdpp)]·DMF 3, which forms a two-dimensional network with (4,4) topology in which ZnO2N2 nodes are interlinked by mbdc and Hdpp linkers. The reaction with 5-methyl-1,3-benzenedicarboxylic acid (H2mbdc-Me) also forms a two-dimensional network structure, [Zn2(mbdc-Me)2(Hdpp)2]·DMF 4, albeit wherein dicarboxylates bridge between zinc-dicarboxylate tapes, themselves formed by interlinking of Zn2(?-carboxylate)2(carboxylate)2 SBUs similar to those in 1. Finally, the reaction with 2,6-naphthalene dicarboxylic acid (H2ndc-2,6) yields two crystalline species, both having the formula [Zn2(2,6-ndc)2(Hdpp)]·DMF 5a/5b and possessing infinite zinc-carboxylate chain motifs interlinked by both naphthalene rings and Hdpp linkers into a three-dimensional framework. In compounds 1, 2b, 3 and 4, the pyrazole NH groups are involved in hydrogen bonding that serves to link either interpenetrated networks or neighbouring sheets together. However, in 2a and 5a/5b the NH groups project into the pores of the framework enabling interactions with guest molecules.

Item Type: Article
DOI/Identification number: 10.1039/c7ce01447c
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: William Gee
Date Deposited: 28 Sep 2017 14:56 UTC
Last Modified: 29 May 2019 19:35 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/63655 (The current URI for this page, for reference purposes)
Gee, William J.: https://orcid.org/0000-0002-6520-6216
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