Abstract
The one-pot synthesis of the Cu(II) complex with hard to access symmetric bis-azoligand is carried out by the reaction of 4,5-dimethyl-1,2-phenylenediamine (Dmpda) with the [Cu2(Piv)4(HPiv)2] complex (Piv is the pivalate anion) in the presence of atmospheric oxygen. The amine form of the ligand takes place and the bis-diiminosemiquinone biradical redox form of the ligand does not take place in the [CuLazo] complex as unambiguously shown by the data of X-ray structure analysis (CIF files CCDC nos. 1877582 (I · DMF) and 1877583 (II), ESR spectroscopy, SQUID magnetometry, and electrochemical and quantum chemical studies. The coordination polymer [Cu2(Piv)4(Dmpda)]n in which the Dmpda molecules perform the bridging function is formed in the same reaction mixture under reduced air pressure.
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ACKNOWLEDGMENTS
The X-ray structure analysis, elemental analysis, and ESR spectroscopy of the obtained compounds and the magnetochemical measurements for compound II were performed at the User Facilities Center of IGIC RAS within the State Assignment on Fundamental Research to the Kurnakov Institute of General and Inorganic Chemistry (Russian Academy of Sciences).
This work was supported by the Russian Science Foundation, project no. 14-23-00176.
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Dedicated to the 90th birthday of Academician I.I. Moiseev
Translated by E. Yablonskaya
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Nikolaevskii, S.A., Kiskin, M.A., Starikov, A.G. et al. Atmospheric Oxygen Influence on the Chemical Transformations of 4,5-Dimethyl-1,2-Phenylenediamine in the Reactions with Copper(II) Pivalate. Russ J Coord Chem 45, 273–287 (2019). https://doi.org/10.1134/S1070328419040067
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DOI: https://doi.org/10.1134/S1070328419040067