On the causes of potential inversion in 1,2,4,5-tetrakis(amino)benzenes

Christopher J. Adams, Rosenildo C. Da Costa, Ruth Edge, Dennis H. Evans, Matthew F. Hood

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Abstract

(Graph Presented) Three 3,6-difluoro-1,2,4,5-tetrakis(amino)benzene compounds, bearing dimethylamino (1), piperidin-1-yl (3), or morpholin-1-yl (5) substituents, have been synthesized and subsequently defluorinated to give the corresponding 1,2,4,5-tetrakis(amino)benzene compounds 2, 4, and 6; the crystal structures of compounds 1, 4, and 6 have been obtained. Cyclic voltammetry shows that all six compounds will lose two electrons to form dications, and the use of suitable oxidizing agents has allowed isolation and crystallographic characterization of the dications 22+ and 62+ (as [PF 6]2 salts) and 42+ (as a [I5][I 3] salt). The separation ΔE between the loss of the first electron and the second varies between compounds, from 0.23Vin 1 to 0.01Vin 6. Eletrochemical studies involving the use of the noncoordinating electrolyte [Bu4N][B{C6H3(CF3)2} 4] show that it is possible to increase this separation, stabilizing the intermediate monocationic phase, and this has allowed the isolation and crystallographic characterization of the radical salts 2[B{C6H 3(CF3)2}4] and 4[B{C 6H3(CF3)2}4], the first radical cations of this family to be isolated. DFT studies of the ion pairing between oxidized forms of 1 and 2 and anions imply that the location of the ion pairing is different in the two species.

Original languageEnglish
Pages (from-to)1168-1178
Number of pages11
JournalJournal of Organic Chemistry
Volume75
Issue number4
DOIs
Publication statusPublished - 19 Feb 2010

Research Beacons, Institutes and Platforms

  • Dalton Nuclear Institute

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