<b>Intramolecular Energy Transfer in a Naphthalene-Anthracene System</b>

Schnepp, O.; Levy, Moshe

doi:10.1021/ja00861a009

Cited by 93 publications

(29 citation statements)

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“…Thus, the cross section for H excitation by a through-space nonradiative energy transfer to form fast H is predicted to be large since it is a resonant process. Efficient energy transfer can occur by through-space mechanisms that are common such as dipole-dipole interactions as described by Förster's theory [45][46][47][48][49]. The hydrino transition energy transferred to form hot hydrogen that undergoes collisional excitation can also be resonant since the energy transfer is q × 13.6 eV.…”

Section: +mentioning

confidence: 99%

Evidence of catalytic production of hot hydrogen in RF generated hydrogen/argon plasmas

Phillips

Chen

Akhtar

et al. 2007

International Journal of Hydrogen Energy

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This is the third in a series of papers by our team on apparently anomalous Balmer series line broadening in hydrogen containing RF generated, low pressure (< 600 mTorr) plasmas. In this paper the selective broadening of the atomic hydrogen lines in pure H 2 and Ar/H 2 mixtures in a large 'GEC' cell (36 cm length × 14 cm ID) was mapped as a function of position, H 2 /Ar ratio, time, power, and pressure. Several observations regarding the selective line broadening were particularly notable as they are unanticipated on the basis of earlier models. First, the anomalous broadening of the Balmer lines was found to exist throughout the plasma, and not just in the region between the electrodes. Second, the broadening was consistently a complex function of the operating parameters particularly gas composition (highest in pure H 2 ), position, power, time and pressure. Clearly not anticipated by earlier models were the findings that under some conditions the highest concentration of 'hot' (>10 eV) hydrogen was found at the entry end, and not in the high field region between the electrodes and that in other conditions, the hottest H was at the (exit) pump (also grounded electrode) end. Third, excitation and electron temperatures were less than one eV in all regions of the plasma not directly adjacent (>1mm) to the electrodes, a Corresponding author: phone 505-665-2682; fax 505-665-5548 jphillips@LanL.gov 2 providing additional evidence that the energy for broadening, contrary to standard models, is not obtained from the field. Fourth, in contrast to our earlier studies of hydrogen/helium and water plasmas, we found that in some conditions 98% of the atomic hydrogen was in the 'hot' state throughout the GEC-type cell. Virtually every operating parameter studied impacted the character of the hot H atom population, and clearly second and third order effects exist, indicating a need for experimental design. Some non-field mechanisms for generating hot hydrogen atoms, specifically those suggested by Mills' CQM model, are outlined.3

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Section: +mentioning

confidence: 99%

Evidence of catalytic production of hot hydrogen in RF generated hydrogen/argon plasmas

Phillips

Chen

Akhtar

et al. 2007

International Journal of Hydrogen Energy

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“…Ethyl 2-acetyl-2-[2-(1-naphthyl)ethyl]-4-oxo-4-phenylbutanoate (16).-Ethyl 2-acetyl-4-(1-naphthyl)butanoate (7 g, 24 mmol) in dimethylformamide (100 cm 3 ) was added slowly to a suspension of sodium hydride (1.2 g, 30 mmol) in dimethylformamide (30 cm 3 ) under an atmosphere of nitrogen, and the mixture stirred for 20 min. Phenacyl bromide (4.9 g, 25 mmol) in dimethylformamide (120 cm 3 ) was added dropwise, and the mixture was stirred at 70 ЊC for 4 h, cooled and poured into water.…”

Section: Synthesismentioning

confidence: 99%

Photochemistry of substituted cyclic enones. Part 11.1 Synthesis and photophysics of 5-arylalkyl-3-phenylcyclopentenones

Kelly¹,

Doyle²,

Guha³

et al. 1998

J. Chem. Soc., Perkin Trans. 2

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The photophysical properties of 3-phenyl-5-[2-(1-naphthyl)ethyl]cyclopent-2-enone and 5-[2-(1-naphthyl)methyl]-3-phenylcyclopent-2-enone have been compared with those of their constituent alkylated chromophores 1-ethylnaphthalene, 3-phenyl-5-(2-phenylethyl)cyclopent-2-enone and 3-phenyl-5-benzylcyclopent-2-enone by means of UV absorption spectroscopy, steady state and time resolved low temperature emission spectroscopy and laser flash photolysis. In mixed solvent low temperature glasses such as ethanol-isopentane-diethyl ether (2 : 5 : 5, v/v) (EPA) phosphorescence decay of all the enones shows multiexponential behaviour consistent with different lifetimes at different solvent sites. The naphthalene derivatives also show a longer lived emission consistent with slow processes involving a naphthalene localised triplet excited state. By contrast in fluid solution flash photolysis experiments reveal that there is rapid equilibration between the enone-and naphthalene-localised states.

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“…Our experimental results show that n,n* absorption in MPA leads to photodecomposition in the chloroethane part of the molecule. In view of the fact that intramolecular energy transfer is known to occur much more efficiently than intermolecular energy transfer (2,3,13) it is possible that MPA photodissociation occurs via intramolecular sensitization. While our data do not permit any conclusions about the mechanism of the reaction, the knowledge that photodecomposition of DDT (14)(15)(16), carried out at exciting wavelengths ranging from 28&250 nm, proceeds via a free radical mechanism, (C-Cl bond cleavage occurs from both the ethane and the aromatic parts of the molecule with the latter being favored at shorter wavelengths) suggests that MPA photolysis occurs via a mechanism similar to the photolysis of DDT at high wavelengths.…”

Section: (3) the Preparation Of Photolysis Productsmentioning

confidence: 99%

The Photodecomposition of an Analogue of DDT

Liu¹,

Silk²,

Unger³

1972

Can. J. Chem.

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The photodecomposition of 1,1,1-trichloro-2,2-bis(5′-chloro-2′-methoxyphenyl)ethane (MPA) has been carried out both in solution and solid phase with exciting light > 300 nm. The major products of the solid phase photolyses are HCl and 1,1-dichloro-2,2-bis(5′-chloro-2′-methoxyphenyl)ethylene (MPE), 5,5′-chloro-2,2′-methoxybenzophenone (MPO), 1,1-dichloro-2,2-bis(5′-chloro-2′-methoxyphenyl)ethane (MPD), and 1-chloro-2,2-bis(5′-chloro-2′-methoxyphenyl)ethane (MPC). In liquid phase and in the presence of O2 the photodecomposition yields many products, the major ones, in addition to HCl, being MPE, MPD, MPC, and MPO. In the absence of O2 in liquid phase only HCl, MPD, MPC, and MPE were observed. In the O2 free photolysis MPD and MPC are produced in larger quantity than MPE. A preliminary investigation has shown that MPE irradiated at λ > 300 nm also photodecomposes. A check carried out by the Canada Department of Agriculture indicates that MPA is a pesticide although it may not be as effective as DDT.

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Intramolecular Energy Transfer in a Naphthalene-Anthracene System

Cited by 93 publications

References 0 publications

Evidence of catalytic production of hot hydrogen in RF generated hydrogen/argon plasmas

Evidence of catalytic production of hot hydrogen in RF generated hydrogen/argon plasmas

Photochemistry of substituted cyclic enones. Part 11.1 Synthesis and photophysics of 5-arylalkyl-3-phenylcyclopentenones

The Photodecomposition of an Analogue of DDT

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