Non-conjugated bichromophoric systems. Part 4. Synthesis and photochemical study of bis-9-anthryls with a four-membered chain; influence of the replacement of methylene links by oxygen atoms or dimethylsilyl groups on the formation of intramolecular excimers and photocyclomers
whereas the second, due to steric strain, leads to PSiC with a very low yield (φR 8 × 10–4;kRDca. 105 s–1). It was observed that the introduction of an oxygen atom instead of a CH2 group enhances the cycloaddition efficiency but the second oxygen did not show any further improvement. The presence of the bulky SiMe2 groups helped the excimer state to be reached (rate of formation at room temperature kDMca
Conformational effects in the fluorescence and photochemistry of [2.n](9,10)anthracenophanes (n = 4, 5)
作者:Albert Dunand、James Ferguson、Miroslav Puza、Glen B. Robertson
DOI:10.1021/ja00530a036
日期:1980.5
Charge transfer complex formation between p-chloranil and 1,n-di(9-anthryl)alkanes
作者:Mustafa Arslan、John Masnovi
DOI:10.1016/j.saa.2005.07.073
日期:2006.6
Dimer model compounds of polyvinylanthracenes (1,n-di(9-anthryl)alkanes, when n = 1-5) were synthesized to model the effects of distance and orientation between anthracene groups in polymeric systems. Charge transfer (CT) complexes of anthracene, 9-methylanthracene and 1,n-di(9-anthryl)alkanes with p-chloranil (p-CHL) have been investigated spectrophotometrically in dichloromethane. The colored products are measured spectrophotometrically at different wavelength depending on the electronic transition between donors and acceptor. The formation constants of the CT complexes were determined by the Benesi-Hildebrand equation. The thermodynamic parameters were calculated by Van't Hoff equation. Stochiometries of the complexes formed between donors and acceptor were defined by the Job's method of the continuous variation and found in 1:1 complexation with donor and acceptor at the maximum absorption bands. (c) 2005 Elsevier B.V. All rights reserved.
Evidence for an Oxygen Anthracene Sandwich Complex
作者:Matthias Klaper、Torsten Linker
DOI:10.1002/anie.201304768
日期:2013.11.4
Oxygen sticks in between acenes: The rate of the photooxygenation of bis(anthryl)alkanes with singlet oxygen shows a maximum for a defined chain length (n=4). In combination with calculations, a bathochromic shift of the UV/Vis absorption for only one endoperoxide and a CT absorption band, this gives considerable evidence for an oxygenanthracenesandwichcomplex.