Subpicosecond measurements of polar solvation dynamics: Coumarin 153 revisited

Journal Article · Thu Nov 30 04:00:00 EST 1995 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100048a004· OSTI ID:171459

Horng, M L; Gardecki, J A; Papazyan, A; Maroncelli, M ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States)

Time-resolved emission measurements of the solute coumarin 153 (C153) are used to probe the time dependence of solvation in 24 common solvents at room temperature. Significant improvements in experimental time resolution ({approx}100 fs instrument response) as well as corresponding improvements in analysis methods provide confidence that all of the spectral evolution (including both the inertial and the diffusive parts of the response) are observed in these measurements. Extensive data concerning the steady-state solvatochromism of C153, coupled to an examination of the effects of vibrational relaxation, further demonstrate that the spectral dynamics being observed accurately monitor the dynamics of nonspecific solvation. Comparisons to theoretical predictions show that models based on the dielectric response of the pure solvent provide a semiquantitative understanding of the dynamics observed. 156 refs., 26 figs., 5 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171459
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 48 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
COUMARIN
DYNAMICS
EMISSION SPECTRA
MATHEMATICAL MODELS
OPTICAL PROPERTIES
POLAR COMPOUNDS
SOLVATION
SOLVENTS
VIBRATIONAL STATES