- Interacting networks of purely organic spin-1/2 dimers
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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. This journal is the Partner Organisations 2014.
- Borozdina, Yulia B.,Mostovich, Evgeny,Enkelmann, Volker,Wolf, Bernd,Cong, Pham T.,Tutsch, Ulrich,Lang, Michael,Baumgarten, Martin
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- Cross-coupling of aryl iodides with paramagnetic terminal acetylenes derived from 4,4,5,5-tetramethyl-2-imidazoline-2-oxyl 3-oxide
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2-(Arylylethynylphenyl)-4,4,5,5-tetramethyl-2-imidazoline-1-oxyl 3-oxides 12 and 13 were synthesized by cross-coupling of aryl iodides with 1-alkynes containing the 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl 3-oxide fragment. A procedure was developed for the preparation of 3-and 4-ethynyibenzaldehydes with the use of 2-methylbut-3-yn-2-ol.
- Klyatskaya, S. V.,Tretyakov, E. V.,Vasilevsky, S. F.
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p. 128 - 134
(2007/10/03)
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