Molecular dynamics of polystyrene model molecules: Solvent effects on intramolecular excimer formation in 2,4-diphenylpentanes

✍ Scribed by Liliane Bokobza; B. Jasse; L. Monnerie

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 392 KB
• Volume: 16
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(80)90039-7

✦ Synopsis

intramolecular excimer formation in 2,4-diphenylpentanes has been examined in a homologous series of alkanes, in ethanol and in mixtures of ethanol, ethylene glycol and glycerol. The ratio of the emission intensities of dimer and monomer (ID/I.) is not affected in low viscosity solvents but, above 4 cP, viscosity effects are discernible and a relationship of the form Io/I,4 = A~-' is obeyed. In methylene chloride, only the dl molecule exhibits a decrease of the efficiency of excimer sampling. The temperature dependence of Io/I. in isooctane and methylene chloride has been interpreted in terms of the activation energy of the excimer sampling.