Short‐chain model studies on emission properties of poly(9‐vinylphenanthrene‐co‐p‐N,N‐dimethylaminostyrene): Exciplex quenching and subsequent formation of another fluorescent exciplex

Abstract

SynopsisThe emission properties of l-(4dimethylaminophenyl)-3-(9-phenanthryl)propane, Ph(CHJ3 DMA, and 1,3di49-phenanthryl)propane, Ph(CH2)3Ph, were studied in comparison with those of poly(9-vinylphenanthreneco-p"-dimethylaminostyrene).Ph(CHJ,DMA showed an intense intramolecular exciplex fluorescence in dioxane. Ph(CH2)3Ph did not exhibit a clear intramolecular excimer fluorescence. The quenching of the intramolecular exciplex by several electron acceptors was studied. As a result moderate electron acceptors, such as cyanobenzene, methyl benzoate, and acrylonitrile, selectively quenched the intramolecular exciplex, and in the case of cyanobenzene the subsequent formation of another fluorescent exciplex was observed. The results were discussed in terms of the reduction potentials of electron accepting quenchers.

Vinyl monomers bearing chromophore moieties and their polymers. VIII. synthesis and fluorescence behavior of a vinyloxy monomer having an electron-accepting chromophore moiety,p-((vinyloxy)methyl)benzonitrile, and its polymers

“…16 Our result is essentially the same. The ratio of isotactic to syndiotactic diads of P(VOMBN) is 61 : 39 as determined by 13 C-NMR from the ␤-methylene carbon resonance (␦: 40.2 ppm) according to the method described in the literature. 15 The high content of isotactic diads would favor the interaction of cyanophenyl groups as shown above.…”

Chemistry of excited complexes in copolymers containing phenanthrene and N,N-dimethylaniline moieties. Effects of chemical structure on the intramolecular exciplex formation, its emission properties, and electron transfer to dicyanobenzene

“…The emission properties and the oxidation potential of the exciplex were studied in comparison with those of a biochromophoric model compound, 1-[4-(dimethylamino) phenyl]-3-(9phenanthryl)propane. 3,4 In the present paper, we report on the emission properties of vinyl copolymers in which phenanthrene and/or IV^V-dimethylaniline chromophores were separated from the main chains by an intervening carboxymethylene group (COOCH2). The results are discussed in relation to the relative geometry of the chromophores.…”