Jet spectroscopy of anthracene-alkane complexes

Babbitt, R. Jefferson; Topp, Michael R.

doi:10.1016/0009-2614(87)85139-4

Cited by 15 publications

(3 citation statements)

References 28 publications

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“…It is reasonable to assume that a sort of complexes is formed in NaY in the presence of various amounts of coadsorbed solvents. The fluorescence spectra showed the gradual red shift, which is reminiscent of the phenomenon in the clusters of aromatic hydrocarbons with various numbers of solvent molecules such as n-hexane in supersonic jet, 23 with increasing amount of the solvents except water. Note that the T 1 -T n absorption spectra (Figure 1) as well as the fluorescence spectra in NaY with coadsorbed n-hexane is appreciably red-shifted compared to those observed in n-hexane solution at room temperature.…”

Section: Resultsmentioning

confidence: 91%

Hypermobility of Aromatic Guest Species in Zeolite as Observed from Anthracene Triplet Self-Quenching within NaY in the Presence of Critical Amounts of Coadsorbed Solvents

1999

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The decay kinetics was investigated of triplet-state anthracene adsorbed into the cavities of a faujasite zeolite, NaY, both in the absence and in the presence of various quantities of water and other coadsorbed inert solvent molecules. It was found that at a sufficiently low loading level of anthracene the decay rate is dependent on the amount of water, methanol, and pyridine but is scarcely affected by n-hexane. When the decay rates are plotted versus the amount of solvents introduced, convex curves were obtained with a peak at ca. 0.1 cm 3 ‚g -1 , which is approximately a quarter of the total pore volume of NaY (0.378 cm 3 ‚g -1 ). The enhanced triplet decay rate was found to be ascribable to a self-quenching event, i.e., the triplet quenching by ground-state anthracene. Thus a picture was given that anthracene molecules are highly mobile when the zeolite cavities are loaded with the coadsorbed solvents in quantities sufficient to shield the cationic sites at which anthracene is supposed to be adsorbed. The kinetic analysis of the triplet quenching process revealed that the inter-cage mobility in the presence of 0.1 cm 3 ‚g -1 of water is more than 100 times higher than that in the presence of 0.3 cm 3 ‚g -1 of water. The high mobility of the guest species is presumably caused by the liberation of adsorption interaction of anthracene with the zeolite walls by the action of small quantities of the solvent molecules with strong affinity toward the zeolite frameworks. By contrast, large quantities of the coadsorbed solvents are expected to interfere with the movement of anthracene in the cage networks because they are crowded enough to fill the interconnecting windows between cages as well as a large portion of the cage volume. The dramatic effect of coadsorbed water and other solvents on the diffusional motion of anthracene within the zeolite supercage networks depending on the quantity adsorbed is described. † This paper is dedicated to Professor Kerry Thomas on the occasion of his 65th birthday.

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Section: Resultsmentioning

confidence: 91%

Hypermobility of Aromatic Guest Species in Zeolite as Observed from Anthracene Triplet Self-Quenching within NaY in the Presence of Critical Amounts of Coadsorbed Solvents

1999

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“…Fluctuations of the solvent cage lead to a broadening of about 100 cm 21 FWHM. Next, the solute -solvent Lennard-Jones potential well depths are increased in Figure 4(b) by 7%, this value being a typical order of magnitude of the ratio of solvation absorption spectral shifts to enthalpies of sublimation in non-polar systems [23,24]. Increasing only the depth of the Lennard-Jones wells induces a solvation red shift of < 620 cm 21 in both the absorption and the emission.…”

Section: Molecular Simulation 47mentioning

confidence: 97%

DL_POLY_2 adaptations for solvation studies

Cazade¹,

Bordat²,

Baraille³

et al. 2011

Molecular Simulation

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“…Supersonic jet spectroscopy has also been explored for detection of capillary gas chromatography effluents (111). The supersonic jet spectroscopy of anthracene in the presence of n-alkanes has been studied (112). A reduced description of molecular line shapes in the fluorescence of polyatomic molecules has been achieved by using a Green function correlation approach (113).…”

Section: Low-temperature Luminescencementioning

confidence: 99%