ESR study of paramagnetic derivatives of sterically hindered di-<Emphasis Type="Italic">o</Emphasis>-quinone with the tetrathiafulvalene bridge |
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| Authors: | V A Kuropatov S V Klementieva A I Poddel’sky V K Cherkasov G A Abakumov |
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| Institution: | (1) Department of Physics, Chemistry and Biology, IFM, Linkoping University, The Emeritus Academy, Linkoping University, SE-581 83 Linkoping, Sweden;(2) Graduate School of Engineering, Hiroshima University, 4-26-8 Takamigaoka, Takaya, Higashi-Hiroshima 739-2115, Japan;(3) Graduate School of Engineering, Nagoya Institute of Technology, 44-66 Midorigaoka, Midori-Machi, Owari-Asahi 488-0822, Japan; |
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| Abstract: | The paramagnetic derivatives of 4,4′,7,7′-tetra-tert-butyl-2,2′-bis-1,3-benzodithiol-5,5′,6,6′-tetraone (1), viz., radical anion salts of the alkali metals (Li, Na, K) and cobaltocenium cations, chelated mono-o-semiquinone complexes with different metal fragments (Tl, TlMe2, SnPh3, Mn(CO)4, Mn(PPh3)(CO)3), a number of copper(I) complexes with sterically hindered phosphines as well as binuclear heterometallic derivatives of
triphenylantimony(V) o-semiquinone-catecholate with the analogous paramagnetic centers, were studied by ESR spectroscopy. The reaction of di-o-quinone 1 with sodium amalgam resulted in the formation of all reduced forms including quinone-semiquinone, disemiquinone, semiquinone-catecholate,
and dicatecholate. A radical cation with the unpaired electron localized on the tetrathiafulvalene (TTF) fragment, which resulted
from the oxidation of di-o-quinone 1, was detected by ESR spectroscopy. |
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