Picosecond Dynamics of Cation-Macrocycle Interactions in the Excited State of an Intrinsic Fluorescence Probe: The Calcium Complex of 4-(N-Monoaza-15-crown-5)-4'-phenylstilbene

P. Dumon (1) , Gediminas Jonusauskas (1) , F. Dupuy (1) , P. Pee (1) , C. Rulliere (1) , J. F. Letard (2) , R. Lapouyade (2)

1 CPMOH - Centre de physique moléculaire optique et hertzienne
2 LPPM - Laboratoire de Photophysique et de Photochimie Moléculaire

Sub-picosecond absorption spectroscopy is used to examine the dynamics of calcium—azacrown interactions in the excited state of 4-(7V-monoaza-15-crown-5)-4,-phenylstilbene, in butyronitrile. This intrinsic fluorescence probe leads (in 8 ± 2 ps) to a new emitting state which is assigned to a twisted intramolecular charge transfer state. When the probe is complexed with Ca2+, the kinetic evolution of the absorption and gain bands is interpreted by a reversible breaking (in 8 ± 2 ps) of the nitrogen—calcium bond followed by the reversible formation (in 50 ± 10 ps) of a solvent-separated cation-probe pair.

Domaines: Physique [physics]; Optique [physics.optics]

P. Dumon, Gediminas Jonusauskas, F. Dupuy, P. Pee, C. Rulliere, et al.. Picosecond Dynamics of Cation-Macrocycle Interactions in the Excited State of an Intrinsic Fluorescence Probe: The Calcium Complex of 4-(N-Monoaza-15-crown-5)-4'-phenylstilbene. The Journal of physical chemistry, 1994, 98 (41), pp.10391-10396. ⟨10.1021/j100092a002⟩. ⟨hal-01549879⟩