Time resolved fluorescent analysis for sealed heating of dimethyl-?-cyclodextrin and naphthalene system

Yamamoto, Keiji; Nakao, Takuma; Yonemochi, Etsuo; Oguchi, Tamio

doi:10.1007/bf01041550

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Formation of the latter was further evidenced by the appearance of a new emission band which was assigned to a naphthalene excimer . A later study on complexes of naphthalene with dimethyl-β-CD prepared by sealed heating confirmed these results …”

Section: Introductionmentioning

confidence: 69%

“…2 A later study on complexes of naphthalene with dimethyl-β-CD prepared by sealed heating confirmed these results. 3 A large number of studies of CD complexation were carried out using substituted naphthalenes as guest molecules. From the photophysical point of view, we may single out here Hamai's extension of his previous work on naphthalene, 2 showing that formation of 2:2 β-CD complexes with concomitant excimer emission is a common phenomenon among naphthalenes substituted with alkyl, 4 halogen, 5 or cyano 6 groups.…”

Section: Introductionmentioning

confidence: 99%

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Solvent Influences on the Photophysics of Naphthalene: Fluorescence and Triplet State Properties in Aqueous Solutions and in Cyclodextrin Complexes

et al. 2000

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The photophysical properties of naphthalene were studied in aqueous solution (H2O and D2O), in some organic solvents (ethanol, hexane, and acetonitrile), and in complexes with the cyclodextrins (CDs) α-CD and β-CD, by means of absorption, steady-state and time-resolved fluorescence, circular dichroism, and triplet−triplet absorption spectroscopies. The structures of the CD inclusion complexes were computed using a dynamic Monte Carlo method. The main difference of the photophysics in the pure aqueous with respect to the organic media consists in a reduction of the fluorescence lifetime, τF, by a factor of about 2.5. Consideration of the triplet properties in aqueous and organic media led to the conclusion that this effect is most probably due to a corresponding increase of the intersystem crossing rate, induced by H2O or D2O. Inclusion of naphthalene in the CD hosts has the effect, at high CD concentration (>0.01 M), of increasing τF with respect to the aqueous medium, the value in α-CD being near to that in the organic media and the value in β-CD intermediate. The spectral and kinetic data are consistent with the predominant formation of 1:2 host:guest complexes with α-CD, and of 1:1 complexes with β-CD, although 2:2 complexes with β-CD are also formed and are identified by their excimer like fluorescence. Several experimental results, including the values of τF, and the temperature dependences of fluorescence and triplet−triplet absorption spectra on one hand and of triplet quenching and triplet−triplet annihilation kinetics on the other, point to a considerable structural flexibility of the 1:2 complex with α-CD.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Solvent Influences on the Photophysics of Naphthalene: Fluorescence and Triplet State Properties in Aqueous Solutions and in Cyclodextrin Complexes

et al. 2000

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“…Preformed excimer-like configurations that are not dimers have been reported for naphthalene and substituted naphthalenes in other environments. [32][33][34][35] To char- acterize this preformed excimer-like configurations in the Mg-Al LDH-CMCD(naphthalene), the temperature variation of the steady-state emission spectra was recorded. Temperature Dependence.…”

Section: Resultsmentioning

confidence: 99%

Aromatic Molecules in Restricted Geometries: Photophysics of Naphthalene Included in a Cyclodextrin Functionalized Layered Solid

Mohanambe

Vasudevan

2005

J. Phys. Chem. B

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The galleries of an Mg-Al layered double hydroxide have been functionalized by intercalation of carboxymethyl beta-cyclodextrin cavities. The anchored cavities form a random array of identical-sized hydrophobic nanopockets arranged in a bilayer fashion in the interlamellar space of the layered solid. Naphthalene molecules have been included within these cavities by partitioning from a polar solvent. The fluorescence from the included naphthalene shows an unusual behavior--the excimer to monomer emission intensity decreases with increasing concentration of included naphthalene. This is shown to be a consequence of the absence of translational mobility of the naphthalene--cyclodextrin adduct in the functionalized solid. Two types of included naphthalene have been identified: a preformed excimer-like species characterized by the absence of rise time in decay measurements and a monomeric species that is incapable of excimer formation due to the absence of suitably located included naphthalenes in its proximity. The concentration of each species and the enthalpy for excimer formation have been determined from the temperature variation of fluorescence intensities.

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Kinetic Determinations and Some Kinetic Aspects of Analytical Chemistry

Crouch¹,

Cullen²,

Scheeline³

et al. 1998

Anal. Chem.

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Time resolved fluorescent analysis for sealed heating of dimethyl-?-cyclodextrin and naphthalene system

Cited by 4 publications

References 4 publications

Solvent Influences on the Photophysics of Naphthalene: Fluorescence and Triplet State Properties in Aqueous Solutions and in Cyclodextrin Complexes

Solvent Influences on the Photophysics of Naphthalene: Fluorescence and Triplet State Properties in Aqueous Solutions and in Cyclodextrin Complexes

Aromatic Molecules in Restricted Geometries: Photophysics of Naphthalene Included in a Cyclodextrin Functionalized Layered Solid

Kinetic Determinations and Some Kinetic Aspects of Analytical Chemistry

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