Optically active fullerene derivatives

Determination of the absolute configurations of these optically active fullerene derivatives was possible by comparison of their experimental and calculated circular dichroism (CD) spectra [96]. Tether controlled bis-cyclopropanation reactions have been extensively used to synthesize extended fimctional architectures such as dyads. 

The e bis-adducts 45 (Scheme 7-8) and ent-AS (not shown) provide examples for optically active fullerene derivatives in which the chirality originates only from the optically active tether, and the intensities of their CD bands (Ae values < 30 cm mmol" ) are smaller than those of ( C)-2 and i A)-2 (Scheme 7-11) with inherently chiral functionalization patterns [25]. 

A review9 with more than 37 references includes an examination of symmetry groups and chirality conditions for C60 and C70 bonded to one or two metals in rf and/or rf fashion. Palladium and platinum rf complexes of C6o and C70 are described (novel synthesis, NMR spectra, electrochemistry) as well as first optically active organometallic fullerene derivatives. 

Figure 59 Optical microscopy images for the blends of four different fullerene derivatives with P3HT. Obvious improvement of the active layer morphology with increase in the solubility of the fullerene derivatives can be observed. (Reproduced from Ref. 180. Wiley-VCH, 2009.)...

Persson N-K, Schubert M, Inganas O (2004) Optical modelling of a layered photovoltaic device with a polyfluorene derivative/fullerene as the active layer. Sol Energy Mater Sol Cells 83 169... 

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