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Issue 35, 2018
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Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures of verdazyl radicals

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Abstract

In this study, we address the question of the origin of ferromagnetic or antiferromagnetic interactions in alkynyl-substituted 1,5-diphenyl-6-oxo verdazyl radicals. While a TMS-alkynyl derivative (3) shows antiferromagnetic ordering at low temperatures, the corresponding deprotected alkynyl verdazyl (4) shows ferromagnetic interactions. For both compounds, magnetic Heisenberg chains are characteristic, which were studied systematically by means of X-ray crystallography and quantum chemical calculations. Ferromagnetic interactions are rarely found in such radicals. Therefore, uncovering such structure–property relationships is of crucial importance in order to understand and design promising ferromagnetic networks. Using this knowledge, we were able to design and crystallize diyne derivatives showing comparable solid state characteristics and therefore antiferro- and ferromagnetic Heisenberg chain structures. We show that the understanding of such property–structure relationships is adequate for the design of organic–magnetic materials with defined cooperative effects within the class of verdazyl radicals.

Graphical abstract: Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures of verdazyl radicals

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Publication details

The article was received on 25 May 2018, accepted on 17 Aug 2018 and first published on 28 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP03332C
Citation: Phys. Chem. Chem. Phys., 2018,20, 22902-22908
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    Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures of verdazyl radicals

    S. Eusterwiemann, C. Doerenkamp, T. Dresselhaus, O. Janka, C. G. Daniliuc, R. Pöttgen, A. Studer, H. Eckert and J. Neugebauer, Phys. Chem. Chem. Phys., 2018, 20, 22902
    DOI: 10.1039/C8CP03332C

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