Other Examples
Hexaphenylbenzenes like H (fig. 3) lend themselves extremely well to forming charge-transfer complexes. Cyclic voltammetry for H displays 4 well separated maxima corresponding to H+ right up to H4+ with the first ionization at E1/2 of only 0.51 eV. oxidation of these arenes by for instance dodecamethylcarboranyl (B) to the blue crystal solid H+B- complex is therefore easy.
The phenyl groups are all positioned in an angle of around 45° with respect to the central aromatic ring and the positive charge in the radical cation is therefore through space delocalised through the 6 benzene rings in the shape of a toroid. The complex has 5 absorption bands in the near infrared region which can be assigned to specific electronic transitions with the aid of deconvolution and the Mulliken-Hush theory.
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