[5]Trovacenyl Boronic Acid, (η<sup>7</sup>-C<sub>7</sub>H<sub>7</sub>)V[η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>B(OH)<sub>2</sub>],\nand Its Anhydride Tri([5]trovacenyl)boroxine,\n1,3,5-[(η<sup>7</sup>-C<sub>7</sub>H<sub>7</sub>)V(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)]<sub>3</sub>B<sub>3</sub>O<sub>3 </sub><sup>†</sup><sup>,1</sup>
Christoph Elschenbroich (2664967)Matthias Wolf (230361)Jürgen Pebler (2692561)Klaus Harms (115968)
Abstract
The paramagnetic boronic acid (η<sup>7</sup>-C<sub>7</sub>H<sub>7</sub>)V[η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>B(OH)<sub>2</sub>] (<b>3</b><sup>•</sup>) has been prepared and\ncharacterized structurally, emphasis being placed on hydrogen bonding motives present in\nthe crystal. EPR spectroscopy reveals that association of <b>3</b><sup>•</sup> is absent in fluid solution. Tri([5]trovacenyl)boroxine, <b>4</b><sup>•••</sup>, the cyclic anhydride of <b>3</b><sup>•</sup>, engages in antiferromagnetic exchange;\nmagnetic susceptometry provides the value <i>J</i>(<b>4</b><sup>•••</sup>) = −1.04 cm<sup>-1</sup>. Accordingly, the EPR\nspectrum of <b>4</b><sup>•••</sup> in fluid solution points to 22 <sup>51</sup>V hyperfine components separated by one-third of the coupling constant of mononuclear trovacene derivatives. Redox splittings δ<i>E</i><sub>1/2</sub>\nbetween consecutive oxidation steps of <b>4</b><sup>•••</sup> are not resolved, i.e., δ<i>E</i><sub>1/2</sub> ≤ 60 mV.
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