We combined experimental and computational approaches to tune the thickness of the films in poly(N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT)-based organic solar cells to maximize the solar absorption by the active layer. High power-conversion efficiencies of 5.2% and 5.7% were obtained on PCDTBT-based solar cells when using [6,6]-phenyl C61-butyric acid methyl ester (PC60BM) and [6,6]-phenyl C71-butyric acid methyl ester (PC70BM) as the electron acceptor, respectively. The cells are designed to have an active area of 1.0 cm2, which is among the largest organic solar cells in the literature, while maintaining a low series resistance of 5 Ω cm2.

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As a chromophore closely related to dipyrromethene (DPM), the azadipyrromethene (ADPM) family has attracted much interest in the life sciences and optoelectronic fields. A high-yielding microwave-assisted synthesis is reported for new homoleptic complexes of cobalt(II), nickel(II), copper(II) and zinc(II) based on the tetrakis(p-methoxyphenyl)azadipyrromethene ligand 1b. These complexes are compared with other homoleptic complexes of the same metal(II) series based on the tetraphenylazadipyrromethene 1a and also with related BF2(+) chelates (Aza-BODIPYs 6a and 6b) for a better understanding of trends arising from substitution of the chelate and/or the electron-donating effect of the p-methoxy substituents. The electrochemical behavior of the new compounds 2b, 3b, and 5b in dichloromethane revealed two pseudoreversible reductions (2b, -1.09 and -1.25 V vs SCE; 3b, -1.05 and -1.29 V; 5b, -1.13 and -1.25 V) followed by a third irreversible process (2b, -1.78 V; 3b, -1.80 V; 5b, -1.77 V) along with two pseudoreversible oxidations (2b, 0.55 and 0.80 V; 3b, 0.56 and 0.80 V; 5b, 0.55 and 0.80 V) followed by two closely spaced irreversible processes (2b, 1.21 and 1.27 V; 3b, 1.21 and 1.28 V; 5b, 1.22 and 1.25 V). On its side, copper(II) homoleptic complex 4b revealed only one pseudoreversible reduction at -0.59 V followed by three irreversible processes at -0.95, -1.54, and -1.74 V, respectively. The oxidation behavior of this complex exhibited two pseudoreversible processes (0.55 and 0.82 V) and two irreversible processes (1.19 and 1.25 V). The redox processes are assigned and discussed in relation to their photophysical properties. X-ray structures for 1b and related copper(II) complex 2b are also discussed.

Abstract:The reported structure of aceanthrene green, a pigment prepared by potassium hydroxide fusion of 1.9-anthracenedicarboxylic imide, was found to be incorrect. The structure of the pigment is reassigned to 7,8,15,16-dibenzo[a j]perylenetetracarboxylic diimide on the basis of COSY, NOESY, and inversion-recovery 'H NMR experiments. N-Alkyl-or N-phenyl-l,9-anthracenedicarboxylic imides, aceanthryleno[l,2-blquinoxaline, and a benzimidazole derivative of 1,9-anthracenedicarboxylic anhydride were found to give the same dibenzo[a jlperylene structure when reacted in potassium hydroxide. The electronic spectra of these derivatives is reported and it is shown that, as predicted by Pariser-Parr-Pople calculations, they absorb in the near-infrared. Finally, a mechanistic outline for the fusion is proposed on the basis of AM1 and frontier molecular orbital calculations.Key words: photoconductor, near-infrared, aceanthrene green, alkalifusion, polycyclic aromatic hydrocarbon.RCsumC : On a trouvC que la structure proposCe anterieurement pour l'ackanthrbne vert, un pigment prCparC par fusion de l'imide de l'acide anthracbne-l,9-dicarboxylique avec de l'hydroxyde de potassium, est incorrecte. En se basant sur des expkriences COSY, NOESY et d'inversion-rCcupCration en RMN du 'H on lui a rCattribuC la structure du diimide de l'acide dibenzo[a jlpCrylbne-7,8,15,16-tCtracarboxylique. On a trouvC que par rCaction, par fusion avec de l'hydroxyde de potassium, les N-alkyl-ou N-phCnylimides de l'acide anthrackne-1,9-di-carboxylique, l'acCanthrylCno[l,2-b]quinoxaline et un dCrivC benzimidazole de l'anhydride de l'acide anthracbne-l,9-dicarboxylique conduisent tous B la m&me structure dibenzo[a jlpCrylkne. On rapporte les spectres Clectroniques de ces dCrivCs et il est montrC, tel que prCdit par des calculs de type Pariser-Parr-Pople, qu'ils absorbent dans le proche infrarouge. Enfin, en se basant sur des calculs d'orbitales molCculaires AM1 et frontibres, on propose un aperp du mCcanisme pour la fusion.Mots cles : photoconducteur, proche infrarouge, acCanthrbne vert, fusion alcaline, hydrocarbure polycyclique aromatique.[Traduit par la rCdaction]