Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 349620
Title Femtosecond Spectroscopic Studies of the One- and Two-Photon Excited-State Dynamics of 2,2,17,17-Tetramethyloctadeca-5,9,13-trien-3,7,11,15-tetrayne: A Trimeric Oligodiacetylene
Author(s) Balkowski, G.M.; Groeneveld, M.; Zhang, H.; Hendrikx, C.C.J.; Polhuis, M.; Zuilhof, H.; Buma, W.J.
Source The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment, & General Theory 110 (2006)40. - ISSN 1089-5639 - p. 11435 - 11439.
Department(s) Laboratory for Organic Chemistry
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) field-effect transistors - polydiacetylene vesicles - conjugated polymer - relaxation - molecules - picosecond - films - conversion - emission - oligomer
Abstract The excited-state dynamics of an oligomer of polydiacetylene, 2,2,17,17-tetramethyloctadeca-5,9,13-trien-3,7,11,15-tetrayne, dissolved in n-hexane have been studied by femtosecond fluorescence upconversion and polarized transient absorption experiments under one- and two-photon excitation conditions. Spectroscopically monitoring the population relaxation in the excited states in real time results in a distinct time separation of the dynamics. It has been concluded that the observed dynamics can be fully accounted for on the basis of the two lower excited states of the target molecule. The S1 (21Ag) state, which cannot be excited from the ground state with one-photon absorption, is verified to be populated via internal conversion in 200 ± 40 fs from the strong dipole-allowed S2 (11Bu) state. The population in the "hot" S1 state subsequently cools with a time constant of 6 ± 1 ps and decays back to the ground state with a lifetime of 790 ± 12 ps.
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