Multichromophoric cyclodextrins. 2. Inhomogeneous spectral broadening and directed energy hopping

Journal Article · Thu Nov 04 04:00:00 EST 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100146a006· OSTI ID:5662619

Berberan-Santos, M N; Pouget, J; Valeur, B ^[1]; Canceill, J; Jullien, L; Lehn, J M ^[2]

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1. Conservatoire National des Arts et Metiers, Paris (France)
2. College de France, Paris (France)

A [beta]-cyclodextrin bearing seven 2-naphthoyloxy chromophores is a good model for the study of the effect of the excitation wavelength on energy hopping among chromophores in well-defined positions, as in photosynthetic antennae. Absorption spectra, emission spectra, and excitation polarization spectra were recorded in a propylene glycol-dioxane glass at 200 K. Comparison is made with a bis(naphthoate) bichromophoric molecule. The parallelism between the increase of emission spectrum displacement and fluorescence anisotropy observed for the red edge of most vibronic bands, and especially for the 0-0 one, is established for the first time. It can be interpreted in terms of inhomogeneous spectral broadening due to solvation heterogeneity. The decrease of energy transfer that is observed upon red-edge excitation is evidence that energy hopping is not chaotic but directed toward lower-energy chromophores. 43 refs., 7 figs.

• OSTI ID: 5662619
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:44; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
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Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400500 -- Photochemistry
ABSORPTION SPECTRA
ANISOTROPY
CARBOHYDRATES
CHEMICAL REACTIONS
CHEMISTRY
DEXTRIN
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORESCENCE
LUMINESCENCE
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOSYNTHESIS
POLYSACCHARIDES
SACCHARIDES
SPECTRA
SPECTROSCOPY
SYNTHESIS