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Volumn 107, Issue 31, 2003, Pages 7838-7853

The photophysics and dynamics of diphenylbutadiene in alkane and perfluoroalkane solvents

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; ALCOHOLS; FRICTION; ORGANIC SOLVENTS;

EID: 0041561045     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp0300703     Document Type: Article
Times cited : (28)

References (109)
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    • u state in DPB and DPH are known to shift in a similar manner with solvent polarizability
    • u state in DPB and DPH are known to shift in a similar manner with solvent polarizability.
  • 49
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    • note
    • If one measures frequencies in absorption and emission as v- and v., the frequencies of the 1/2 intensity points on the low- and high-frequency edges of the spectra, the differences between the absorption and emission shifts with solvent are much smaller, with the emission shifts generally being slightly larger than those in absorption.
  • 54
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    • note
    • -1, approximately independent of temperature (-50 to +50 °C). Unfortunately, these measurements were based on assuming the quantum yield of the alkane mixture at 25 °C to be the same as the quantum yield of DPB in cyclohexane reported by Birks and Dyson. Given the much larger viscosity of cyclohexane compared to the alkane mixture, this value is expected to substantially overestimate the radiative rate.
  • 60
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    • For a detailed discussion on the friction on rotational motion of DPB see ref 8
    • For a detailed discussion on the friction on rotational motion of DPB see ref 8.
  • 61
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    • note
    • The shape factor for stick boundary conditions was determined by numerically integrating the expressions in ref 62 and that for slip boundary conditions by interpolating the tabulated data in ref 63.
  • 64
    • 0042397542 scopus 로고    scopus 로고
    • note
    • It is interesting to note that Hochstrasser and co-workers had measured rotation times of the related solute "stiff-6 DPB" in the n-alkane series n = 6-16, and their times nearly coincide with the rotation times of DPB in n-alkanes shown in Figure 5.
  • 70
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    • note
    • 2 represent the two inertial moments that rotate the solute axis being observed.
  • 74
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    • note
    • 1.10.
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    • note
    • v.
  • 76
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    • note
    • 3) after dividing the latter by Ξ = 0.74, the packing fraction of close packed spheres.
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    • note
    • -1.
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    • note
    • p with p = 1.5, provides a convenient representation of rotation data for a wide range of solutes and nonpolar solvents.
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    • note
    • nr. No significant improvement to the fits of n-alkane data was found using this extra parameter.
  • 84
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    • note
    • -1 = 0.743 + 1.706n for the perfluoro-n-aIkanes. (Based on fits to data from ref 102 in the case of the alkanes and refs 2, 103, and 104 in the case of the perfluoroalkanes.)
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    • Theory of activated rate processes
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    • We also examined use of a quadratic function but the added flexibility did not provide substantially better results
    • We also examined use of a quadratic function but the added flexibility did not provide substantially better results.
  • 91
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    • note
    • Excluded from this fitting are the room-temperature n-butane data from ref 14 which appear to be anomalous relative to the other data in that work.
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    • note
    • fit is the fitted value of this point.
  • 94
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    • note
    • D were obtained from the parametrizations in ref 101.
  • 95
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    • note
    • The values of rotational friction calculated by Anderton and Kauffman in ref 19 are approximately 2-fold smaller than the ones calculated here because of a missing factor of two in the effective moment of inertia used by those authors.
  • 96
    • 0042397539 scopus 로고    scopus 로고
    • note
    • obs < 50 ps, the resolution of the instrument used in ref 19). We also note that in the case of methanol, the data in ref 17 are 20% smaller than those from ref 19 and are therefore in much closer agreement with the predictions of the fit.
  • 99
    • 0042397535 scopus 로고    scopus 로고
    • note
    • 3 and find no significant difference in the quality of the fits compared to those using eq 19.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.