Anthracene ionic hydrogenation

It was found that the Et3SiH and boron trifluoride monohydrate (a strong acid compatible with Et3SiH) ionic hydrogenation system produces partially hydrogenated anthracene [Eq. (11.77)] and naphthacene in excellent yield under mild conditions 240... 

The ionic pair of [Co(AMMEsar)] + cation with an anthracene carboxylate anion (A-Co(III)) was used as both a photosensitizer and an ETA in the photodecomposition of water to produce hydrogen [387]. The photoreduction of encapsulated cobalt(III) ion to cobalt(II) ion occurs on excitation of anthracene chromophore (v< 25 000 cm-i). The A-Co(III) complex shows almost no fluorescence (0<2x 10 ), whereas the A-Co(II) complex produces specific violet fluorescence (Fig. 66). The cobalt(II) complex is formed in the presence of EDTA on light irradiation of the A-Co(III) solution (v> 25 641 cm i). The visible band at 21 276 cm- disappeared, and violet fluorescence was observed. The quantum yield of cobalt(II) complex formation was... 

Among the homomolecular PAH compounds, anthracene has long been the "hydrogen-atom for theoretical calculations. It now appears that there are distinct differences not only in the quantitative response of various members of the PAH family to light, but there may be qualitative differences as well. As one proceeds from naphthalene to pentacene for example, the optical absorption spectrum shows a significant increase in the contribution of states that have ionic character (1). This increase in... 

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