Charge transfer complex formation between p-chloranil and 1,n-di(9-anthryl)alkanes
摘要:
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.
Nineteen 1,3-bis(aryl)propane derivatives and six model compounds with a single chromophore were used to explore the chiral discrimination ability of cellulose derivatives, in particular cellulose triphenylcarbamate (CTC), in connection with the mode of interaction of these probe molecules with adsorbents. The interaction was evaluated by conformational analysis of the probe molecules and circular dichroism. Thc 1,3-bis(aryl)propanes with 9-anthryl moieties possessed a highly limited conformation owing to thc bulky substituent and hardly changed their shape on CTC as evidenced by CD spectra; thus, they may be regarded as ''rigid'' substrates. However, these ''rigid'' substrates were resolved quite effectively. On the other hand, those with 2-naphthyl moieties possessed a number of stable conformations and could change their shape in diastereomeric complexes on CTC; thus, they may be assumed as ''soft'' substrates, against which the chiral discrimination was inefficient. The present study revealed that the optical resolution may be interpreted at least partly in terms of the ''rigid'' and ''soft'' concept.
Time-resolved observation of excitation hopping between two anthryl moieties attached to both ends of alkanes: simulation based on conformational analysis
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.