Galadzhun, I orcid.org/0000-0003-3828-7097, Kulmaczewski, R orcid.org/0000-0002-3855-4530, Cespedes, O orcid.org/0000-0002-5249-9523 et al. (1 more author) (2021) Iron/2,6-di(pyrazol-1-yl)pyridine derivatives with a discotic pattern of alkyl and alkynyl substituents. European Journal of Inorganic Chemistry, 2021 (29). pp. 2999-3007. ISSN 1434-1948
Abstract
2,6-Di(4-iodopyrazol-1-yl)pyridine is converted to 2,6-di(4-{alkyn-1-yl}pyrazol-1-yl)pyridine ( L 1 R; R’ = C n H 2 n ‒3 , n = 12, 14, 16) derivatives by Sonogashira reactions. Hydrogenation of these intermediates yields the corresponding 2,6-di(4-alkylpyrazol-1-yl)pyridine ( L 2 R; R = C n H 2 n +1 ) derivatives. Homoleptic Fe[BF 4 ] 2 complexes of all these ligands were prepared, bearing four long chain substituents in a discotic-type array. Crystallographic data from two L 1 R ligands imply the alkynyl substituents do not undergo intermolecular interdigitation in the solid state, which could explain the lower crystallinity and ill-defined spin-crossover in their iron complexes. Solid [Fe( L 2 R) 2 ][BF 4 ] 2 ( n = 12 and 14) exhibit an irreversible, abrupt low→high-spin event near 350 K, which is not associated with solvent loss and may involve disordering of their alkyl chain conformations. No mesophase behavior was observed from any of these compounds.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Iron; N ligands; spin-crossover; magnetic properties; metallomesogens |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Inorganic Chemistry (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/K012568/1 EPSRC (Engineering and Physical Sciences Research Council) EP/K00512X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Jun 2021 11:51 |
Last Modified: | 08 Jan 2025 15:20 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/ejic.202100435 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:175101 |