Perylene derivatives

Phthalazinedione 83a reacts with perylene derivatives anomalously to provide polycyclic pyridazine derivatives (82S854). Dibenzoperylene 130 provided 67% of pyridazine 133, probably via Diels-Alder adduct 131,... 

Since the same dye molecules can serve as both donors and acceptors and the transfer efficiency depends on the spectral overlap between the emission spectrum of the donor and the absorption spectrum of the acceptor, this efficiency also depends on the Stokes shift [53]. Involvement of these effects depends strongly on the properties of the dye. Fluoresceins and rhodamines exhibit high homo-FRET efficiency and self-quenching pyrene and perylene derivatives, high homo-FRET but little self-quenching and luminescent metal complexes may not exhibit homo-FRET at all because of their very strong Stokes shifts. 

A nanocrystalline Sn02 solar cell sensitized by a perylene derivative produced 0.9% efficiency under AM 1.5 (7 = 3.26 mA/cm2 and = 0.45 V) [132]. A nanocrystalline Ti02 solar cell (1 cm2) sensitized by eosin Y, oneof the... 

Influence of solute-solvent interactions on the quenching dynamics of perylene derivatives in an electron donating solvent... 

Ferrere, S. Zaban, A. Gregg, B. A. Dye sensitization of nanocrystalline tin oxide by perylene derivative, J. Phys. Chem. 1997, B101, 4490. 

Novel properties can be obtained with the combination of exciton effects with dynamic molecular processes such as for the coupling of the perylene derivative 7 to form the bichromophore 8. 7 forms yellow fluorescent solutions [19] as is shown in Fig. 5. The coupling of two chromophores such as in 8 induces an appreciable increase of the absorptivity by exciton interaction both... 

The polyphenylene dendrimers were fbimd to effectively isolate large chromophores such as perylene derivatives, when two polyphenylene dendrons (first through third generation) are attached to a perylenediimide core (PDl) (Scheme 34) [95]. Although the alkoxy substituents in the bay area of the perylene twist the core out of planarity, the chromophore is only shghtly blue-shifted when incorporated into the dendrimers. Therefore, energy transfer from the polyphenylene dendrons is still accomphshed with high efficiency. 

The molecular materials obtained from Syntec GmbH Wolfen were prepurified by a two-step sublimation prior to the deposition. The organic materials and the metals were evaporated from Knudsen cells kept at 280 °C for PTCDA, 270 °C for DiMe-PTCDI, 930 °C for Ag, 830 °C for In, and at 375 °C for Mg, resulting in deposition rates of 0.3 nm/min for both perylene derivatives, 1.6 nm/min for Ag and 2 nm/min for In and Mg. During the growth of these films, the substrates were kept at room temperature. 

Figure 25.1 Selected organic molecules discussed in the course of this chapter. Special attention is drawn to tetracene and diindenoperylene both representing different classes of PAHs, viz. oligoacenes and perylene-derivatives, which are of great interest for organic electronic applications.

For investigations of the structural influence on the electronic behavioiu, crystals of the perylene-derivative diindenoperylene were prepared by physi-cal-vapoiu-transport in a temperatiue gradient under streaming FI2 carrier gas... 

This peak potential also fits the linear correlation established between pola-rographic oxidation half-wave potentials for substituted aromatic compounds and their ionization potentials [161]. It should be noted that the radical cation of 66 may be either a 7r-delocalized or S,S 2c, 3e o species. Compound 67 shows a reversible first oxidation potential in acetonitrile with E1/2=0.87 V vs SCE [162]. Perylene derivative 68 exhibits a first oxidation peak in nitrobenzene at 0.65 V vs Ag/AgCl [163]. Because of the good thermal stability and high electrical conductivity of the radical cation of 68 [164], functionalized analogues have also been prepared and studied [165]. Poly(alkylthio)pyracyclene has been studied [166]. 

Although the classical Wurtz-Fittig synthesis has been widely replaced by procedures using milder reaction conditions (see following chapters), alkali metals like potassium in dimethoxyethane (DME) have been used in the dimerization of 1,1 binaphthyls (e.g. 47, see Scheme 21) to perylene derivatives (e.g. 

Applications of pigments for coatings, printing and information storage are widespread, but the fabrication of thin films of pigments is difficult because of their insoluble nature. Dyes, on the other hand, are easier to manipulate. Research at the Xerox Corporation has shown that Lewis acid complexes can be utilized to solubilize and lay down thin films of certain pigments. For example, the photosensitive perylene derivative shown below forms an adduct with AICI3 ... 

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