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.
Read more about this topic: Charge-transfer Complex
Famous quotes containing the word examples:
“It is hardly to be believed how spiritual reflections when mixed with a little physics can hold people’s attention and give them a livelier idea of God than do the often ill-applied examples of his wrath.”
—G.C. (Georg Christoph)
“There are many examples of women that have excelled in learning, and even in war, but this is no reason we should bring ‘em all up to Latin and Greek or else military discipline, instead of needle-work and housewifry.”
—Bernard Mandeville (1670–1733)