Počet záznamů: 1

Ultrafast Excited-State Dynamics ef [Re(L)(CO)(3)(bpy)](n) Complexes: Involvement of the Solvent

  1. 1.
    0347663 - UFCH-W 2011 RIV US eng J - Článek v odborném periodiku
    Nahhas, A. E. - Cannizzo, A. - van Mourik, F. - Blanco-Rodríguez, A. M. - Záliš, Stanislav - Vlček Jr., Antonín - Chergui, M.
    Ultrafast Excited-State Dynamics ef [Re(L)(CO)(3)(bpy)](n) Complexes: Involvement of the Solvent.
    Journal of Physical Chemistry A. Roč. 114, č. 22 (2010), s. 6361-6369 ISSN 1089-5639
    Grant CEP: GA MŠk OC09043
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: ultrafast excited-state dynamics * spectroscopy * TD-DFT
    Kód oboru RIV: CG - Elektrochemie
    Impakt faktor: 2.732, rok: 2010

    Ultrafast excited-state dynamics of [Re(L)(CO)(3)(bpy)](n) (L = Cl, Br, n = 0; L = 4-ethyl-pyridine (Etpy), n = 1+; bpy = 2,2'-bipyridine) have been investigated in dimethylformamide (DMF) solution by fluorescence up-conversion (FIUC) and UV - vis transient absorption (TA) with similar to 100 is time,resolution. TA was also measured in the [1-ethyl-3-methyl-imidazolium]BF4 ionic liquid. The complexes show a very broad fluorescence band at 540-550 nm at zero time delay, which decays with 100-140 Is (depending on L) by intersystem crossing (ISC) to pi pi* intraligand ((IL)-I-3) and a Re(L)(CO)(3) -> bpy charge-transfer ((CT)-C-3) excited states. A second emission decay component (1.1-1.7 ps). apparent in the red part of the spectrum, is attributed to (IL)-I-3 -> (CT)-C-3 conversion, leaving phosphorescence from the lowest (CT)-C-3 state as the only emission signal at longer time delays. The triplet conversion is slower in DMF than acetonitrile, commensurate with solvation times.
    Trvalý link: http://hdl.handle.net/11104/0006027