Ultrafast Excited-State Dynamics of Rhenium(I) Photosensitizers [Re(Cl)(CO)3(N,N)] and [Re(imidazole)(CO)3(N,N)]+: Diimine Effects

0358797 - ÚFCH JH 2012 RIV US eng J - Článek v odborném periodiku
Nahhas, A. E. - Consani, C. - Blanco-Rodríguez, A. M. - Lancaster, K. M. - Braem, O. - Cannizzo, A. - Towrie, M. - Clark, I. P. - Záliš, Stanislav - Chergui, M. - Vlček, Antonín
Ultrafast Excited-State Dynamics of Rhenium(I) Photosensitizers [Re(Cl)(CO)3(N,N)] and [Re(imidazole)(CO)3(N,N)]+: Diimine Effects.
Inorganic Chemistry. Roč. 50, č. 7 (2011), s. 2932-2943. ISSN 0020-1669. E-ISSN 1520-510X
Grant CEP: GA MŠMT(CZ) ME10124; GA MŠMT(CZ) LD11082
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: rhenium * photosynthesis * diimine effects
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 4.601, rok: 2011

Femto- to picosecond excited-state dynamics of the complexes [Re(L)(CO)3(N,N)]n (N,N = bpy, phen, 4,7-dimethyl-phen (dmp); L = Cl, n = 0; L = imidazole, n = 1+) were investigated using fluorescence up-conversion, transient absorption in the 650−285 nm range (using broad-band UV probe pulses around 300 nm) and picosecond time-resolved IR (TRIR) spectroscopy in the region of CO stretching vibrations. Optically populated singlet charge-transfer (CT) state(s) undergo femtosecond intersystem crossing to at least two hot triplet states with a rate that is faster in Cl (100 fs)−1 than in imidazole (150 fs)−1 complexes but essentially independent of the N,N ligand. TRIR spectra indicate the presence of two long-lived triplet states that are populated simultaneously and equilibrate in a few picoseconds. The minor state accounts for less than 20% of the relaxed excited population.
Trvalý link: http://hdl.handle.net/11104/0006409