Laser flash photolysis of a 4,4'-methylene bis(phenyl isocyanate) (MDI) based polyurethane and model carbamates

Hoyle, Charles E.; No, Y. G.; Malone, Ken; Thames, Shelby F.; Creed, David

doi:10.1021/ma00187a013

Cited by 14 publications

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“…It can be assumed that in the case of the 2-aminobenzoic acid anion, photoionization occurs from the S 1 state of ABA − to form the hydrated electron and 2-carboxyanilinyl radical (ABA • ). It is worth noting that anilinyl-type radicals have an absorption maximum at 400−420 nm. , The linear dependence of Δ A 405 on Δ A 720 (Figure ) allows one from the known absorption coefficient of the hydrated electron to determine a similar parameter for the ABA • radical (ε 405 = 2.6 × 10 3 M −1 cm −1 ).…”

Section: Resultsmentioning

confidence: 99%

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Photophysics and Photochemistry of 2-Aminobenzoic Acid Anion in Aqueous Solution

2009

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Nanosecond laser flash photolysis and absorption and fluorescence spectroscopy were used to study photochemical processes of 2-aminobenzoic acid anion (ABA(-)) in aqueous solutions. Excitation of this species gives rise to the ABA(-) triplet state to the ABA* radical and to the hydrated electron (e(aq)(-)). The last two species result from two-photon processes. In a neutral medium, the main decay channels of ABA(-) triplet state, the ABA* radical, and e(aq)(-) are T-T annihilation, recombination, and capture by the ABA(-) anion, respectively.

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Section: Resultsmentioning

confidence: 99%

“…It is worth noting that anilinyl-type radicals have an absorption maximum at 400-420 nm. 24,25 The linear dependence of ∆A 405 on ∆A 720 (Figure 5) allows one from the known absorption coefficient of the hydrated electron to determine a similar parameter for the ABA • radical (ε 405 ) 2.6 × 10 3 M -1 cm -1 ).…”

Section: Resultsmentioning

confidence: 99%

Photophysics and Photochemistry of 2-Aminobenzoic Acid Anion in Aqueous Solution

2009

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“…4) The N-C(=O) bond of O-alkyl N-arylcarbamate is cleaved through S 1 95) and the corresponding anilino radical has been detected by LFP, 96) but mostly by irradiation at <290 nm. When the phenyl ring is substituted with an electrondonating group, the N-phenyl bond is favorably cleaved, 97) as reported for diethofencarb.…”

Section: )mentioning

confidence: 99%

Direct photolysis mechanism of pesticides in water

Katagi

2018

Journal of Pesticide Science

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Photodegradation is one of the most important abiotic transformations for pesticides in the aquatic environment, and the high energy of sunlight causes characteristic reactions such as bond scission, cyclization, and rearrangement, which are scarcely observed in hydrolysis and microbial degradation. This review deals with direct photolysis via excitation of a pesticide by absorbing natural or artificial sunlight in order to know its basic photochemistry, and indirect photolysis meaning either sensitization by dissolved organic matters or oxidation by reactive oxygen species is basically excluded. Several experimental approaches including spectroscopic techniques together with theoretical calculations are first discussed from the viewpoint of the reaction mechanisms in direct photolysis. Then, the typical photoreactions of pesticides are summarized by chemical classes and/or functional groups and discussed as far as possible in relation to their mechanisms.

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Polyurethane Building Blocks

Sonnenschein

2014

Polyurethanes

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Laser flash photolysis of a 4,4'-methylene bis(phenyl isocyanate) (MDI) based polyurethane and model carbamates

Cited by 14 publications

References 1 publication

Photophysics and Photochemistry of 2-Aminobenzoic Acid Anion in Aqueous Solution

Photophysics and Photochemistry of 2-Aminobenzoic Acid Anion in Aqueous Solution

Direct photolysis mechanism of pesticides in water

Polyurethane Building Blocks

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