1-Naphthylmethyl methacrylate

Fluorescence quenching of PS 17,161,190,191), P2VN 157,192 194-> poly(l-naphthyl methacrylate) 149,199, poly(2-naphthylmethyl methacrylate 1SS>, P(S-co-MMA)161), and P(2VN-co-S)194) in solution has been examined. In all cases except one for PS 161, plots of IDi0/Id versus [Q] showed upward curvature similar to Eq. (7). Excimer fluorescence was quenched more rapidly than monomer fluorescence with increasing [Q]. In addition, the observed quenching of the fluorescence ratio and of the monomer fluorescence was roughly linear in [Q]. 

The quenching properties of poly(l-(2-naphthyl)ethyl methacrylate) provide an interesting comparison with those of poly(2-naphthylmethyl methacrylate), because... 

P>MA Particles. PIB-stabilized PbWA particles were prepared containing naphthalene [N] groups covalently attached to the fTWA chains. This was effected quite simply by adding l naphthylmethyl methacrylate to the NWA polymerization step of the particle synthesis. From reactivity ratios, one knows that the N groups are randomly distributed along the P>MA chains. The particles were purified by repeated centrifugation, replacement of the supernatant serum with fresh solvent (isooctane) and redispersion. A fluorescence spectrum of the dispersion was typical of that of a 1-alkyl-naphthalene. Chemical analysis indicated a particle composition IB/NWA/N of 13/100/10. 

In later work it was shown that water-soluble antennas could be made by copolymerizing aa oinatic monomers such as vinyl naphthalene and naphthylmethyl methacrylate with polyelectrolytes such as acrylic acid [3,4]. The high efficiency of these antennas in dilute aqueous base was attributed to the hypercoiling of the poly-(acrylic acid) chain to give a pseudo micellar stincture such as that illustrated schematically in Figure 2. We believe that such structures are formed spontaneously in solution due to the hydro-phobic interactions of the large aromatic ccmiponents stabilized by the interaction of water with the hydrophillic carboxyl anions. 

Figure 13. Semi-logarithmic plot of phosphorescence intensity versus time after exposure of polystyrene-naphthylmethyl methacrylate to oxygen [10]. Film thickness (cmxlO ) and temperature, respectively O 8.0, -50.0 C A 8.0, -62.0°C 17,...

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