Photostable Fluorophenyl-Substituted Cyclometalated Platinum(II) Emitters for Monitoring of Molecular Oxygen in Real Time
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The effects of fluorophenyl substituents on the photoluminescence, redox properties, and oxygen sensing behaviors of the cyclometalated Pt(II) complexes are reported. The Pt(II) complexes with fluorophenyl substituents at the para position on the phenyl ring of 2-phenylpyridine (ppy) exhibit higher oxygen sensitivities than those at the meta position. Photodegradation tests demonstrate that the introduction of fluorophenyl substituents can strongly improve the photostability of cyclometalated Pt(II) complexes. Fast response and recovery times of oxygen sensing films are obtained in 3.0 s on going from 0% O2 to 100% O2 and in 4.0 s on going from 100% O2 to 0% O2 (95% recovery of the luminescence), respectively. The oxygen sensing films show excellent operational stability in 4000 s saturation O2/N2 cycles, which meets the requirement of monitoring molecular oxygen in real time.Keywords:
Photodegradation
Saturation (graph theory)
Oxygen sensor
Physical aspects of the photodegradation of polymers. Photochemical aspects of degradation of polymers. Photodegradation and photo-oxidative degradation of homochain polymers. Photodegradation and photo-oxidative degradation of heterochain polymers. Role of metal compounds in the photodegradation of polymers. Degradation of polymers initiated by radicals formed from photolysis of different compounds. Degradation of polymers by oxygen reactive species formed from photoreactions of oxygen. Photodegradable polymers. Photodegradation of polymers in extreme conditions. Experimental methods in polymer degradation. References. Index.
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The photodegradation of pesticides was investigated on adsorbed phases: silica, kaolin, bentonite and on a standard soil. Kinetic results show that the photodegradation of phenmedipham is dependant on the nature of the support. On silica and bentonite the degradation is immediate while the photodegradation is slow on kaolin and standard soil. Also, the nature of the photodegradation depends on the reactional mechanism on the support.
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Photodegradation of Polycyclic Aromatic Hydrocarbons (PAHs) is a main environmental behavior and plays an important role in the fate of PAHs in environment.In order to understand the photodegradation law of Polycyclic Aromatic Hydrocarbons(PAHs)in soil, aeolian sand in blow-sand region of Northern Shaanxi was chosen as typical soil and phenanthrene (Phe) as typical pollutant of PAHs.Photodegradation law of Phe on soil surface was simulated.In addition, effects of initial Phe concentration, light intensity, time and pH on photodegradation of Phe in aeolian sand was assessed.Results show that the photodegradation of Phe followed pseudo first-order kinetics.Photodegradation rate constant of Phe increased with the increasing of irradiation intensity which the order was as followed: 125W>100W>75W>50W.Irradiation intensity enhances photodegradation of PAHs on soil surfaces.Photodegradation half-life of Phe ranged from 2.474 hours to 3.095 hours under different irradiation intensity.Degradation rate increases as pH increase and photodegradation is more rapid in alkaline medium.Photodegradation rate is the lowest as initial concentration is the largest.
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Polycyclic aromatic hydrocarbons (PAHs) are a group of major contaminants that are ubiquitous in the environment due to their toxicity, mutagenicity and carcinogenicity. This paper studied the soil borne PAHs photodegradation under UV irradiation with phenanthrene(Phe) as target contaminants. The effects of temperature,humic acids(HA)and the intensity of UV irradiation on the Phe photodegradation were investigated. The dynamics of photodegradation of Phe were studied under different conditions. The results show that the rate of Phe photodegradation increases when the temperature rises from 20 ℃ to 30 ℃. The HA played a sensitivizing role during the Phe photodegradation. When the HA concentration was 5 mg·kg-1, HA could efficiently sensitivize the Phe photodegradation. The rate of photodegradation decreases with the decreasing UV irradiation intensity, correlated positively. The half-life increases with the decreasing UV irradiation intensity, correlated negatively.
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The photodegradation of pesticides was investigated on adsorbed phases: silica, kaolin, bentonite and on a standard soil. Kinetic results show that the photodegradation of phenmedipham is dependant on the nature of the support. On silica and bentonite the degradation is immediate while the photodegradation is slow on kaolin and standard soil. Also, the nature of the photodegradation depends on the reactional mechanism on the support.
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Al-backed PVF film shows more photodegradation than does the non-metalized PVF film. The effect of several metal substrates (Al, Cu, Ag, and Au) on the photodegradation of polyacrylonitrile (PAN) has been examined. Under oxidative conditions, the order of PAN photodegradation in M/PAN films is shown to be Cu/PAN » PAN » Al/PAN > Au/PAN > Ag/PAN. Formation of carbonyl group during the photodegradation is predominant in the cases of Al and Au. Under nonoxidative conditions there is no evidence of carbonyl group formation, but the photodegradation of Cu/PAN is still substantial. Under oxidative conditions the Cu/PAN film begins to char after approximately one hour, compared with four and a half hours under nonoxidative conditions. The photodegradation mechanism in the range of 250 ≤ λ ≤ 400 nm suggests the formation of M(CN) x species, but no such species are detected spectroscopically at the energy employed. A catalytic effect of metal films on the photodegradation of PAN is obvious.
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Abstract Enhancement of the photodegradation of bisphenol A (BPA) by β‐cyclodextrin (β‐CD) was investigated under a 30 W UV disinfection lamp (λ max = 254 nm). The photodegradation rate of BPA in aqueous solutions with β‐CD was faster than that in aqueous solutions without β‐CD; for example, after 50 min of UV irradiation, β‐CD had increased the photodegradation efficiency by about 46.5% for 10 mg dm −3 BPA. The photodegradation of 2.5–20 mg dm −3 BPA in aqueous solutions was found to follow pseudo‐first‐order kinetics. The first‐order rate constant showed a 12‐fold increase in the presence of β‐CD. Factors such as β‐CD concentration, pH, BPA initial concentration and organic solvent influencing the photodegradation of BPA were studied and are described in detail. Variations in the pH and electrical conductivity of solutions were observed during the photodegradation process. The enhancement of photodegradation of BPA results mainly from the lower bond energy between some atoms in the BPA molecule after inclusion interaction with β‐CD. Copyright © 2006 Society of Chemical Industry
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