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Cover Picture: Novel Core‐Expanded Rylenebis(Dicarboximide) Dyes Bearing Pentacene Units: Facile Synthesis and Photophysical Properties (Chem. Eur. J. 23/2007)
Author(s) -
Avlasevich Yuri,
Müller Sibylle,
Erk Peter,
Müllen Klaus
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200790084
Subject(s) - hypsochromic shift , chromophore , chemistry , perylene , molecule , fluorescence , photochemistry , combinatorial chemistry , organic chemistry , physics , quantum mechanics
Like two monkeys attacking a pineapple “bay”‐positions of dibromorylene dyes are attacked by dehydrobenzene molecules (formed from trimethylsilylbenzene triflate with CsF). Pd 0 ‐catalyzed benzannulation affords novel core‐expanded rylenebis(dicarboximides) bearing pentacene units in the aromatic core. Synthesized new chromophores are characterized by a significant hypsochromic shift of absorption (40–60 nm relative to parent dyes), excellent photostabilities, and high fluorescence quantum yields. The details of the study are presented in the Full Paper by K. Müllen et al. on page 6555 ff.