Singlet oxygen generation using PDMS occluded dyes

Laar, F.M.P.R. van; Holsteyns, Frank; Vankelecom, Ivo F.J.; Smeets, Stefan; Dehaen, Wim; Jacobs, Pierre

doi:10.1016/s1010-6030(01)00532-9

Cited by 37 publications

(33 citation statements)

References 21 publications

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“…These problems can be overcome by the application of a new generation of sensitizers, more resistant to autodegradation, in immobilized state [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Singlet molecular oxygen application for 2-chlorophenol removal

Gryglik

Miller

Ledakowicz

2007

Journal of Hazardous Materials

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“…These problems can be overcome by the application of a new generation of sensitizers, more resistant to autodegradation, in immobilized state [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Singlet molecular oxygen application for 2-chlorophenol removal

Gryglik

Miller

Ledakowicz

2007

Journal of Hazardous Materials

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“…Unlike their more common tetrapyrrolic congeners, the porphyrins and phthalocyanins, they offer a much higher potential for creating structural diversity. With the inherent synthetic ease of including diverse peripheral substituents, they are seen as promising materials having potential applications in diverse areas such as chemical sensors [10][11][12][13], biomedical diagnosis [14] and therapeutic reagents [15][16][17][18][19][20][21][22][23], optical data storage [24,25], non-linear optics [26][27][28] and liquid crystals. Metallo-tetraazaporphyrins are also useful in electrographic recording [29], making magnetic toner ink [30], in molecular photovoltaics [31,32] and in making optical light switches [33].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of new octakis(benzylthio)tetraazaporphyrin complexes with bivalent transition metal ions and an investigation of their spectral, redox and catalytic properties

Prasad

Kumar

2004

Transition Metal Chemistry

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Transition metals in the þ2 oxidation state form complexes with octakis(benzylthio)tetraazaporphyrin [M{TAP(SBn) 8 }] (M ¼ Mn 2þ , Co 2þ , Ni 2þ , Cu 2þ , Zn 2þ and 2H þ ; Bn ¼ ACH 2 Ph; TAP ¼ tetraazaporphyrin) and were prepared via demetallation of the template-synthesized complex [Mg{TAP(SBn) 8 }] in ClCH 2 COOH, followed by insertion of the metal ions in a PhCl-DMF mixture. All compounds were characterized by u.v-vis, 1 H-n.m.r., e.s.r. and mass spectra, microanalyses and magnetic susceptibility data. PM3 geometry optimization showed near coplanar arrangement of five phenyl rings vis-a`-vis the TAP ring plane, while the remaining three phenyl rings lie bent over it. The Mn 2þ , Co 2þ and Cu 2þ complexes exhibited reversible one electron oxidation waves, that were observed at E 1/2 À0.33, À0.29 and 0.58 V versus Ag/AgCl respectively. They all exhibited an irreversible reduction wave at E p À1.1 V versus Ag/AgCl followed by appearance of an irreversible oxidation wave at E p 1.1-1.2 V versus Ag/AgCl. This has been interpreted in terms of reductive dissociation, leading to removal of the benzyl substituents, and subsequent oxidation of thiolate products. The Mn 2þ , Co 2þ and Cu 2þ complexes exhibited metal ion-based e.s.r. signals. The [Co{TAP(SBn) 8 }] complex in a homogeneous DMF solution was found to catalyze electroreduction/oxidation of nitrite ions. In the presence of a 1/5 molar quantity of the complex [Co{TAP(SBn) 8 }], the nitrite reduction peak was observed to be shifted by 0.1 V towards the positive potential side and the peak current rose by a factor of 1.33. Similarly a sharp rise in the anodic current, corresponding to oxidation of nitrite ions, was observed in the presence of the complex.

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“…28 In addition, polymer with dyes covalently bound find potential application in molecular designing of photochemical sensors, 29 as well as in photodynamic therapy to sensitize singlet oxygen generation. 30 In the present work, the photophysical properties of the dyes 9-aminoacridine and Nile blue bound to poly (methacrylic acid) are described. The effect of the viscosity in photophysical properties of these dyes is discussed in terms of changes in conformational properties of the polymer in solution.…”

Section: Introductionmentioning

confidence: 99%

Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution

Oliveira¹,

Gehlen²

2003

J. Braz. Chem. Soc.

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Soluções de poli(ácido metacrílico) atático, PAMA com peso molecular na faixa de (1,6 a 3,4) x 10 5 g mol -1 , e com corantes fluorescentes 9-aminoacridina ou azul do nilo ligados à cadeia, foram estudados por medidas fotofísicas em função da viscosidade e polaridade do solvente. O comportamento dos segmentos da cadeia do PAMA nas vizinhanças da sonda fluorescente foi descrito pela mudança na rotação difusional dos corantes. O etilenoglicol expande a cadeia polimérica quando comparada com a forma mais compactada do corante-PAMA em 50% água/etilenoglicol. A variação do tempo de relaxação rotacional do corante ligado ao PAMA indica uma expansão progressiva da cadeia polimérica para uma forma aberta em etilenoglicol.Solutions of atactic poly(methacrylic acid), PMAA, with molecular weights in the range of (1.6 to 3.4) x 10 5 g mol -1 , and labeled with the fluorescent dyes 9-aminoacridine or Nile blue were studied by photophysical measurements as a function of solvent viscosity and polarity. The conformational behavior of the PMAA chain segments around the fluorescent probe was reported by the change in the rotational diffusion of the dyes. Ethylene glycol swells the polymer chain compared with the more contracted conformation of PMAA in 50% water/ethylene glycol. The change in the rotational relaxation time of the dye bound to PMAA with the decrease of water content in the solvent mixture indicates a progressive expansion of polymer chain to a more open coil form in solution.Keywords: dyes, polyelectrolytes, PMAA, rotational diffusion, solvent friction IntroductionPhotophysical studies of polymers in solution have been extensively reported in recent years. 1,2 Time resolved fluorescence spectroscopy (TRFS) was found to be particularly useful in the study of several types of polymers in solution, and in the presence of additives. 3-10 Time resolved anisotropy decay of a fluorescent probe attached to a polymer chain reflects the rotational relaxation of the probe, and the local dynamics of the polymer segments in solution. 2 The dependence of the segmental dynamics as a function solvent viscosity was studied by TRFS using anthracene attached to 1,2 polybutadiene. 11,12 The polymer local dynamics as well as the structural properties and relaxation processes of polymer and blends were studied by steady state and dynamic fluorescence using anthranyl and pyrenyl groups. [13][14][15] Fluorescence studies of polymethacrylic acid (PMAA) and polyacrylic acid (PAA) containing aromatic fluorescent probes such as naphthalene, anthracene and pyrene have been carried out by many authors to elucidate the properties of those polyelectrolytes in different solvents, pH, and surfactant addition. [16][17][18][19][20] Fluorescence anisotropy reflects the microviscosity and the solubilization dynamics of the probe molecule in solutions of polyelectrolytes. Reports in the literature using polarization and anisotropy of rhodamine 6 G in ethylene glycol demonstrate that the depolarization properties of the probe have relations with the solv...

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Singlet oxygen generation using PDMS occluded dyes

Cited by 37 publications

References 21 publications

Singlet molecular oxygen application for 2-chlorophenol removal

Singlet molecular oxygen application for 2-chlorophenol removal

Synthesis of new octakis(benzylthio)tetraazaporphyrin complexes with bivalent transition metal ions and an investigation of their spectral, redox and catalytic properties

Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution

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