Luminescence of anionically polymerized poly(2-isopropenylnaphthalene)

✍ Scribed by D.A. Holden; J. Kovářová; J.E. Guillet; D. Engel; Th. Rhein; R.C. Schulz

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 370 KB
• Volume: 19
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(83)90074-5

✦ Synopsis

In fluid solution poly(2-isopropenylnaphthalene) (PIPN) forms excimers more readily than any other known polymer. Its fluorescence spectrum in 2-methyl-THF solution at 77 K consists nevertheless of emission from isolated "monomeric" naphthalene chromophores. The delayed luminescence of these glasses is very different from that observed for other naphthalene-containing polymers and consists of normal monomer phosphorescence and two delayed fluorescent species with maxima at 340 and 400 nm. On the basis of the large molecular weight dependence of the relative intensities of these two bands, they are assigned to emission from a weakly interacting chromophore pair and a chain-end excimer, respectively. The pronounced differences between the photophysics of PIPN and poly(2-vinylnaphthalene) are attributed to a raising of the energy of the ground-state conformation in PIPN by severe steric crowding.