Biphasic photochemistry: time-resolved spectra of adsorbed hydrocarbons

Hara, Kiyoaki; Mayo, P. De; Ware, William R.; Weedon, Alan C.; Wong, G.S.K.; Wu, K.

doi:10.1016/0009-2614(80)80023-6

Cited by 57 publications

(20 citation statements)

References 16 publications

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“…54 The observed molar absorption coefficients and oscillator strengths show that the first excited state is very weak (the molar absorption coefficients of naphthalene for the S 0 →S 1 transition in the crystalline 50 and gas 47 phases are on the order of 100-200 M -1 cm -1 ; the total oscillator strengths are f = 0.00196 (octane) 50 and f = 0.002 (gas phase). 47 Naphthalene is known to form excimers at high concentrations in nonpolar solvents, 55 solid solutions in silicate glass, 56 and in the adsorbed state on silica 57 or inside cyclodextrins, 58 in contrast to aqueous solutions where only monomer emission is observed. 58 The mutual orientation of naphthalene molecules in crystals does not allow for intermolecular electronic interactions; thus, no excimers are observed in pure naphthalene crystals at atmospheric pressure.…”

Section: Introductionmentioning

confidence: 97%

“…60,61 The observed maxima of naphthalene excimers range from 375 to 420 nm. 57,58 The fluorescence emission spectrum of naphthalene in ice showed monomer emission around 320 nm and emission with maxima at 387, 408 and 434 nm, which were assigned to excimeric emission of naphthalene. 9 In a subsequent study, numerous bands assigned to the excimeric emission of naphthalene were observed along with strong scattering.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic Properties of Naphthalene on the Surface of Ice Grains Revisited: A Combined Experimental–Computational Approach

Krausko¹,

Malongwe²,

Bičanová³

et al. 2015

J. Phys. Chem. A

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An experimental-computational method is used to investigate the spectroscopic behavior of naphthalene on the surface of ice grains. UV-vis diffuse reflectance and fluorescence spectroscopies of naphthalene combined with DFT and ADC(2) calculations provide evidence for the occurrence of excited-state associates. The measured and calculated bathochromic shifts of the S0 → S1 electronic transitions related to naphthalene dimers or naphthalene-ice interactions do not exceed 3 nm. The bands observed in the emission spectrum of frozen naphthalene solutions are assigned to excited dimers of different mutual orientations, naphthalene phosphorescence, and fluorescence of anthracene present as a trace impurity and populated by the energy transfer from excited naphthalene. Photochemical reactivity in/on ice and snow is dependent on the absorption properties and speciation of the compounds present in these media. Hence, within this study, we exploit frozen solutions of naphthalene to demonstrate both the absence of considerable bathochromic shift and a strong tendency to aggregate.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Spectroscopic Properties of Naphthalene on the Surface of Ice Grains Revisited: A Combined Experimental–Computational Approach

Krausko¹,

Malongwe²,

Bičanová³

et al. 2015

J. Phys. Chem. A

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“…9,10 Narrow quasi-line spectra are obtained in Shpolskii matrices (frozen alkanes), 9,10 while the spectra obtained on pure silica gel or in silica glass matrices exhibit inhomogeneous broadening. 9,[11][12][13] The relative intensities of individual emission peaks of pyrene and, therefore, the overall emission bandshape also depend on the environment. [14][15][16][17][18][19] This dependence made it possible to use pyrene as an environment polarity probe.…”

Section: Introductionmentioning

confidence: 99%

Ab initio simulation of pyrene spectra in water matrices

Freidzon,

Valiev,

Berezhnoy

2014

RSC Adv.

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“…1(a)), an increase in the S 1 ← S 0 ( 1 L b ) transition band around 372 nm is observed. Some authors believe this absorption is due to ground state dimers (also known as bimolecular ground state associations, BGSAs) 25, 26 and others argue that it is due to the presence of pyrene microcrystals.…”

Section: Resultsmentioning

confidence: 99%

Pyrene—p-tert-butylcalixarenes inclusion complexes formation: a surface photochemistry study

Branco

Ferreira

Rego

et al. 2006

Photochem Photobiol Sci

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Diffuse reflectance and luminescence techniques were used to study the photophysics and photochemistry of pyrene within p-tert-butylcalix [n]arenes with n = 4, 6, and 8, and to study their ability to form inclusion complexes in heterogeneous media. Evidences for inclusion complex formation were found for the three hosts under study. [8]arene. This feature is particularly relevant for calix [6]arene, suggesting a very favourable situation for the hydrogen atom abstraction to occur. The analysis of the degradation products revealed the presence of hydroxypyrene as a major photodegradation product for the three hosts. Dihydro-hydroxypyrene was also formed in the case of calix[6]arene and calix [8]arene. The formation of the calixarene's phenoxyl radical and subsequent hydrogen abstraction is consistent with the formation of dihydro-dihydroxypyrene.

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Biphasic photochemistry: time-resolved spectra of adsorbed hydrocarbons

Cited by 57 publications

References 16 publications

Spectroscopic Properties of Naphthalene on the Surface of Ice Grains Revisited: A Combined Experimental–Computational Approach

Spectroscopic Properties of Naphthalene on the Surface of Ice Grains Revisited: A Combined Experimental–Computational Approach

Ab initio simulation of pyrene spectra in water matrices

Pyrene—p-tert-butylcalixarenes inclusion complexes formation: a surface photochemistry study

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