Rendement quantique de la photolyse du nitrométhane

Jarosiewicz, M.; Szychlinski, J.; Piszczek, L.

doi:10.1016/0047-2670(85)85006-1

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…The water collected from the roof covered with galvanized sheet is distinguished by a significantly higher zinc content (3164,55 µg Zn/l) than in the other samples (below 1000 µg Zn/l). This dependence on roofing was also indicated by other researchers [16,24]. For rainwater harvested directly from precipitation, the highest concentrations of heavy metals were recorded in the spring.…”

Section: Heavy Metals In Rainwatersupporting

confidence: 82%

“…Lee et al showed that the average pH reaches higher values in the spring and summer, while Leong et al stated that the reaction is reduced in the summer and winter months. The reason for this phenomenon is the increased content of nitrogen and sulfur compounds that get into the atmosphere as a result of the combustion of liquid and fossil fuels [15,16,17].…”

Section: The Quality Of Rainwatermentioning

confidence: 99%

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An assessment of the quality and use of rainwater as the basis for sustainable water management in suburban areas

2018

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A common economic use of rainwater is the basis for strategies that will allow the water sector to adapt to progressive climate change. Rainwater is a basic part of water resources that ensures the renewal of the surface and groundwater, therefore they should be protected against pollution and be managed and used in places of rainfall. This is particularly true for heavily urbanized, agricultural and industrial areas. Stormwater collection and storage systems have been introduced in many countries [1]. The water obtained in this way is a valuable source of fresh water, thanks to which it is possible to reduce the demand for tap water by almost 60% or use it during periods of drought [1,2]. The idea of the sustainable management of water resources and the increasing ecological consciousness of society have allowed installations for the collection and use of rainwater in residential houses and public buildings to become an increasingly popular phenomenon [3,4]. The research and assessment of rainwater quality is a guarantee of safety for its users. The article presents the results of research on the physical and chemical quality of rainwater collected directly from precipitation. Samples for research were collected in a suburban area during March-November 2015. The pH, turbidity, permanganate index, OWO, nitrogen compounds, phosphates, oxygen content, acidity, basicity, conductivity, hardness, and heavy metals content were determined. The obtained results were the basis for indicating the possibility of using rainwater for various economic purposes.

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Section: Heavy Metals In Rainwatersupporting

confidence: 82%

Section: The Quality Of Rainwatermentioning

confidence: 99%

An assessment of the quality and use of rainwater as the basis for sustainable water management in suburban areas

2018

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“…In fact, photodissociation of gas-phase nitromethane causes primarily the omolythic cleavage of the C-N bond, through excitation of either the πfπ* or the σfπ* transition. 44 The C-N bond breaking was identified as the main primary process also in the nitromethane photodissociation in the liquid phase 45 and in the Ar matrix at 14 K, 46 as well as in higher nitroalkanes. 47 Our finding of the possible methanol formation at high pressure, occurring only in the photoassisted reaction, strongly suggests that the C-N bond photodissociation also occurs in the bulk crystalline phase of nitromethane.…”

Section: Y(t)mentioning

confidence: 99%

Nitromethane Decomposition under High Static Pressure

Citroni¹,

Bini²,

Pagliai³

et al. 2010

J. Phys. Chem. B

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The room-temperature pressure-induced reaction of nitromethane has been studied by means of infrared spectroscopy in conjunction with ab initio molecular dynamics simulations. The evolution of the IR spectrum during the reaction has been monitored at 32.2 and 35.5 GPa performing the measurements in a diamond anvil cell. The simulations allowed the characterization of the onset of the high-pressure reaction, showing that its mechanism has a complex bimolecular character and involves the formation of the aci-ion of nitromethane. The growth of a three-dimensional disordered polymer has been evidenced both in the experiments and in the simulations. On decompression of the sample, after the reaction, a continuous evolution of the product is observed with a decomposition into smaller molecules. This behavior has been confirmed by the simulations and represents an important novelty in the scene of the known high-pressure reactions of molecular systems. The major reaction product on decompression is N-methylformamide, the smallest molecule containing the peptide bond. The high-pressure reaction of crystalline nitromethane under irradiation at 458 nm was also experimentally studied. The reaction threshold pressure is significantly lowered by the electronic excitation through two-photon absorption, and methanol, not detected in the purely pressure-induced reaction, is formed. The presence of ammonium carbonate is also observed.

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“…In order to avoid the surface effects of the reactor and secondary reactions at high temperature, gas phase photodissociation has been used to understand the primary processes and dissociation products. In the UV photolysis (320-280 nm) of gaseous nitromethane, dissociation into CH 3 and NO 2 radicals is the most efficient [φ = 0⋅6] *For correspondence primary process 6 . Isomerisation of CH 3 NO 2 to CH 3 ONO and subsequent decay of the latter to CH 3 O and NO was observed in molecular beam study 7 in the TEA CO 2 laser excitation of CH 3 NO 2 .…”

Section: Ch 3 No 2 → Ch 3 + No 2 mentioning

confidence: 99%

“…Dissociation of nitro compounds continues to be a topic of current research due to their important role in explosive materials and atmospheric chemistry [1][2][3][4][5] . Nitromethane (CH 3 NO 2 ), the first member of this series is the most studied molecule in this class [6][7][8][9][10] . It has been shown to undergo dissociation into following primary channels on excitation.…”

Section: Introductionmentioning

confidence: 99%

TEA CO2 laser-induced reaction of CH3NO2 with CF2HCl: A mechanistic study

2001

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Dissociation of nitromethane has been observed when a mixture of CF 2 HCl and CH 3 NO 2 is irradiated using pulsed TEA CO 2 laser at 9R (24) line (1081 cm-1), which is strongly absorbed by CF 2 HCl but not by CH 3 NO 2. Under low laser fluence conditions, only nitromethane dissociates, whereas at high fluence CF 2 HCl also undergoes dissociation, showing that dissociation occurs via the vibrational energy transfer processes from the TEA CO 2 laser-excited CF 2 HCl to CH 3 NO 2. Time-resolved infrared fluorescence from vibrationally excited CF 2 HCl and CH 3 NO 2 molecules as well as UV absorption of CF 2 radicals are carried out to elucidate the dynamics of excitation/dissociation and the chemical reactions of the dissociation products.

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Rendement quantique de la photolyse du nitrométhane

Cited by 4 publications

References 13 publications

An assessment of the quality and use of rainwater as the basis for sustainable water management in suburban areas

An assessment of the quality and use of rainwater as the basis for sustainable water management in suburban areas

Nitromethane Decomposition under High Static Pressure

TEA CO2 laser-induced reaction of CH3NO2 with CF2HCl: A mechanistic study

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