Ultrafast Dynamics of Metal Complexes of Tetrasulphonated Phthalocyanines
| Autor: | Marc Tondusson, Halina Abramczyk, Geoffrey Galle, Arkadiusz Jarota, Eric Freysz |
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| Přispěvatelé: | Institute of Applied Radiation Chemistry [Łódź University of Technology], Łódź University of Technology, Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), research project 'Preparation and implementation of new fields of studies in response to the needs of a contemporary labour market and requirements of knowledgebased economy' UDA-POKL.04.01.01.-00-213-/08-00 and NCN Grant Nr 3845/B/T02/2009/37 |
| Rok vydání: | 2012 |
| Předmět: |
Indoles
Time Factors Molecular Structure 010405 organic chemistry Chemistry Relaxation (NMR) Nanosecond 010402 general chemistry Photochemistry 01 natural sciences Fluorescence spectroscopy 0104 chemical sciences [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Chemical physics Picosecond Femtosecond Organometallic Compounds Vibrational energy relaxation Thermodynamics Molecule [CHIM.COOR]Chemical Sciences/Coordination chemistry Physical and Theoretical Chemistry Ground state |
| Zdroj: | Journal of Physical Chemistry A Journal of Physical Chemistry A, American Chemical Society, 2012, 116 (16), pp.4000-4009. ⟨10.1021/jp3017979⟩ |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/jp3017979 |
| Popis: | International audience; A promising material in medicine, electronics, optoelectronics, electrochemistry, catalysis, and photophysics, tetrasulphonated aluminum phthalocyanine (AlPcS4), is investigated by means of steady-state and time-resolved pump?probe spectroscopies. Absorption and steady-state fluorescence spectroscopy indicate that AlPcS4 is essentially monomeric. Spectrally resolved pump-probe data are recorded on time scales ranging from femtoseconds to nanoseconds. The nature of these fast processes and pathways of the competing relaxation processes from the initially excited electronic states in aqueous and organic (dimethyl sulfoxide) solutions are discussed. The decays and bleaching recovery have been fitted in the ultrafast window (0-10 ps) and later time window extending to nanoseconds (0-1 ns). While the excited-state dynamics have been found to be sensitive to the solvent environment, we were able to show that the fast dynamics is described by three time constants in the ranges of 115-500 fs, 2-25 ps, and 150-500 ps. We were able to ascribe these three time constants to different processes. The shortest time constants have been assigned to vibrational wavepacket dynamics. The few picosecond components have been assigned to vibrational relaxation in the excited electronic states. Finally, the 150-500 ps components represent the decay from S1 to the ground state. The experimental and theoretical treatment proposed in this paper provides a basis for a substantial revision of the commonly accepted interpretation of the Soret transition (B transition) that exists in the literature. |
| Databáze: | OpenAIRE |
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