A power conversion efficiency of 0.37%, under white light of 80 mW cm-2 intensity, was obtained when a fullerene-azothiophene dyad was used as the active layer of a photovoltaic cell.

A dianiline derivative of a symmetric donor-acceptor-donor diketopyrrolopyrrole-based dye is employed for the two-sided covalent functionalization of liquid exfoliated few layers graphene flakes, through a direct arylation reaction. The resulting nanohybrid features the properties of a polymeric species, being solution-processed into homogeneous thin films, featuring a pronounced red-shift of the main absorption band with respect to the model dye unit and energy levels comparable to those of common diketopyrrolopyrrole-based polymers. A good electrical conductivity and the absence of radical signals generated after intense white light illumination, as probed through electron paramagnetic resonance, suggest a possible future application of this composite material in the field of photoprotective, antistatic layers with tunable colors.

The protonation site of some alkyl- (MeNHNH2 and Me2NNH2) and aryl- (ArNHNH2, Ar = Ph, 4-OMeC6H4, 4-NO2C6H4) hydrazines has been investigated in water, methanol, and dimethyl sulfoxide as solvents by measuring the change in the relaxation rate of 14N, 15N, and 13C between the neutral and protonated forms. The relative stability of the two protonated forms was also investigated theoretically by means of semiempirical and ab initio calculations. The preferred protonation site of 1,1-dimethylhydrazine is the alkylated nitrogen, whereas methylhydrazine may also undergo protonation at the unsubstituted nitrogen. Phenylhydrazine and 4-nitrophenylhydrazine are protonated at the primary amine nitrogen, whereas 4-methoxyphenylhydrazine undergoes protonation at both nitrogens.

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