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Issue 32, 2014
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Interacting networks of purely organic spin–1/2 dimers

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Abstract

In the present study we report the synthesis of some novel nitronyl nitroxide biradical systems 1–4c with various π-bridges between the radical centres. UV-Vis, IR, EPR and X-ray diffraction studies, along with MS and NMR data where appropriate, are described. Magnetic measurements revealed that the biradicals 1c, 3c and 4c exhibit a moderately strong antiferromagnetic intra-molecular exchange, whereas nitroxide 2c shows a significantly higher exchange coupling, which can only be explained by the presence of strong inter-molecular interactions. From DFT calculations performed on the basis of the X-ray crystal structure of compound 4c, a theoretical value of the intra-dimer coupling constant Jintra = −8.6 K is obtained. Direct proof also for inter-molecular arrangement with Jinter ∼ −2 K was provided by the low temperature AC studies of biradical 4c. According to the magnetic characterization, the nitronyl biradical 4c is a promising candidate for a purely organic-based low-dimensional quantum magnet.

Graphical abstract: Interacting networks of purely organic spin–1/2 dimers

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The article was received on 27 Feb 2014, accepted on 25 Jun 2014 and first published on 26 Jun 2014


Article type: Paper
DOI: 10.1039/C4TC00399C
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Citation: J. Mater. Chem. C, 2014,2, 6618-6629
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    Interacting networks of purely organic spin–1/2 dimers

    Y. B. Borozdina, E. Mostovich, V. Enkelmann, B. Wolf, P. T. Cong, U. Tutsch, M. Lang and M. Baumgarten, J. Mater. Chem. C, 2014, 2, 6618
    DOI: 10.1039/C4TC00399C

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