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

SYSNO ASEP	0358797
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Ultrafast Excited-State Dynamics of Rhenium(I) Photosensitizers [Re(Cl)(CO)3(N,N)] and [Re(imidazole)(CO)3(N,N)]+: Diimine Effects
Author(s)	Nahhas, A. E. (CH) Consani, C. (CH) Blanco-Rodríguez, A. M. (GB) Lancaster, K. M. (US) Braem, O. (CH) Cannizzo, A. (CH) Towrie, M. (GB) Clark, I. P. (GB) Záliš, Stanislav (UFCH-W)_{RID, ORCID} Chergui, M. (CH) Vlček, Antonín (UFCH-W)_{RID, ORCID}
Source Title	Inorganic Chemistry. - : American Chemical Society - ISSN 0020-1669 Roč. 50, č. 7 (2011), s. 2932-2943
Number of pages	12 s.
Language	eng - English
Country	US - United States
Keywords	rhenium ; photosynthesis ; diimine effects
Subject RIV	CF - Physical ; Theoretical Chemistry
R&D Projects	ME10124 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	LD11082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z40400503 - UFCH-W (2005-2011)
UT WOS	000288730400033
DOI	10.1021/ic102324p
Annotation	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.
Workplace	J. Heyrovsky Institute of Physical Chemistry
Contact	Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
Year of Publishing	2012

Number of the records: 1