Photoinduced electron transfer from indolic compounds to 1-pyrenemethanol in polystyrene latex dispersions

Nakashima, Kenichi; Tanida, Senri; Miyamoto, Tsuyoshi; Hashimoto, Shuichi

doi:10.1016/s1010-6030(98)00331-1

Cited by 11 publications

(10 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A modified Stern-Volmer calculation (Fig. 6), 78 taking into account This journal is © The Royal Society of Chemistry and Owner Societies 2006 the presence of two fluorophore populations, shows that 80% of the Mes-BODIPY molecules can be quenched (close to ligand residues), only 20% of dye molecules are not accessible for quenching (far from cyclam moieties).…”

Section: Sensing Of Metal Ions: Sensitivity and Selectivity Of Fnlcyc...mentioning

confidence: 99%

Fluorescent nanoparticles as selective Cu(ii) sensors

Méallet‐Renault

Herault

Vachon

et al. 2006

Photochem Photobiol Sci

View full text Add to dashboard Cite

Latex nanoparticles functionalized with cyclam (1,4,8,11-tetraazacyclotetradecane), a copper chelator, have been doped with a fluorescent dye (BODIPY derivative: 4,4-difluoro-8-(2',4',6'-trimethyl)phenyl-2,6-diethyl-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene). The bulky, hydrophobic fluorophore dissolves within the nanoparticles' polymer core up to a concentration of about 88.4 micromol g(-1). At this concentration the fluorescence yield is about 0.80. Adding Cu2+ ions to the solution decreases the fluorescence because of the energy transfer between the dye and the violet copper cyclam complexes. The response is fast: 90% of the quenching occurs within 1 s. The Cu2+ detection threshold is of 1 nanomolar. No interferences were observed with zinc and nickel ions.

show abstract

Section: Sensing Of Metal Ions: Sensitivity and Selectivity Of Fnlcyc...mentioning

confidence: 99%

Fluorescent nanoparticles as selective Cu(ii) sensors

Méallet‐Renault

Herault

Vachon

et al. 2006

Photochem Photobiol Sci

View full text Add to dashboard Cite

show abstract

“…[13][14][15] Recently, we used latex particles as micro-substrates for photoreactions and found that the efficiencies of the reactions were dramatically enhanced. [16][17][18][19][20][21] It is well-known that the fluorescence of pyrene (Py), anthracene (An), and their derivatives is quenched by alkyl viologens through a photoinduced electron transfer (PET) mechanism. [21][22][23] However, the efficiency of PET was surprisingly different between An and its cationic derivative, 21 although both cationic and neutral probes were supposed to be adsorbed on the surface of the latex particles.…”

Section: Introductionmentioning

confidence: 99%

“…Latex particles have received increasing attention in latex coatings, , biomedical fields, − and drug delivery . They are also used as model systems in colloid research because of their well-defined physicochemical characteristics. − Recently, we used latex particles as micro-substrates for photoreactions and found that the efficiencies of the reactions were dramatically enhanced. − …”

Section: Introductionmentioning

confidence: 99%

Photoinduced Electron Transfer from Pyrenes to Alkyl Viologens on the Surface of Polystyrene Latex Particles: Effects of Polarities of the Donors and Charge Densities of the Particles

Gong

Nakashima

2001

J. Phys. Chem. B

Self Cite

View full text Add to dashboard Cite

Photoinduced electron transfers (PET) from pyrene (Py), 1-pyrenemethanol (PyM), and 1-Pyrenebutyltrimethylammonium bromide (PBTAB) to alkyl viologens, such as methyl viologen (MV2+) and Octyl viologen (OV2+), in polystyrene latex (PSL) aqueous dispersions have been studied by steady-state fluorescence, time-resolved fluorescence, and adsorption/desorption measurements. From steady state fluorescence measurements, it is found that the PET is remarkably enhanced on going from the aqueous homogeneous solution to the latex dispersion. The PET efficiency increases with increasing polarity of the electron donors in the PSL dispersions; PBTAB shows the highest efficiency and Py shows the lowest one. The low PET efficiency of Py in the PSL dispersion is attributed to penetration of Py, as revealed by the I 1/I 3 ratio in the vibronic fine structure of Py fluorescence spectrum. The PET efficiency of PBTAB in PSL dispersion increases with the increase in the charge density of the particle, but decreases with the increase in alkyl-chain length of the quencher. The alkyl viologen with longer alkyl-chain weakens the PET efficiency by desorbing the donors from the latex surface and/or preventing the donors from effective approach with higher steric hindrance effect.

show abstract

“…Furthermore, latex particles have many other advantageous features as described in previous papers. 1,2 We have investigated several photoreactions, such as electronic energy transfer 3,4 and electron transfer, 2,5 on the surface of polystyrene (PS) and poly(butyl methacrylate) latexes in aqueous dispersions, and demonstrated the usefulness of the latexes as micro-substrates for the photoreactions. Here, we report photoinduced electron transfer (PET) from pyrene (Py) to methylviologen (MV 2+ ) in PS latex dispersions.…”

mentioning

confidence: 99%

“…The existence of such compartments is also suggested in our experiments for the present system and also for another system. 2 The Stern-Volmer plot [Fig. 1(b)] shows a downward curve, indicating that the fluorescence of Py is partly protected from quenching by MV 2+ on the PS latex particles.…”

mentioning

confidence: 99%