Charge transfer initiated by optical excitation in diester substituted biphenylpyrene as a function of the solvent characterized by excited state absorption spectroscopy

Seggern, David von; Modrakowski, Claudia; Spitz, Christian; Schlüter, A. Dieter; Menzel, Ralf

doi:10.1016/j.chemphys.2004.04.002

Cited by 3 publications

(2 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, the shape of the emission bands and the emission maxima depend strongly on the solvent used ( Figure 5 ). These phenomena are attributed to a solvatochromic shift of the emission maximum as often observed for charge transfer transitions [ 19 , 48 - 50 ]. The shape of the emission bands is independent of the sample concentration (in the 10 -4 to 10 -8 M range), thus ruling out intermolecular excimer formation.…”

Section: Resultsmentioning

confidence: 99%

Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System

D’Aléo

Cecchetto

Cola

et al. 2009

Sensors

View full text Add to dashboard Cite

The synthesis, electrochemical and photophysical properties of a branched molecule 3,5-bis(pyrene-1-yl)-4′-phenyl-2,2′:6′,2″-terpyridine are reported. Spectroscopy in different solvents reveals that an optical electron transfer from the pyrene donor to the terpyridyl electron acceptor can occur in polar media, as the system displays both charge transfer (CT) absorption and CT emission. Furthermore, the study of the zinc complex as well as the bis-protonated form shows an enhancement of the electron transfer character of the system, by an increase of the acceptor strength. This is accompanied by a large increase of the non-radiative processes. With sub-nanosecond transient absorption spectroscopy, the CT state, consisting of the pyrene radical cation and the terpyridine radical anion, has been detected. At room temperature, the study of the nanosecond transient absorption spectra reveals the formation of a low-lying triplet excited state that we attribute to the pyrene moiety through which the CT state decays. At 77K, the absence of the terpyridine triplet emission also suggests the population of a low-lying triplet state of the pyrene unit.

show abstract

Section: Resultsmentioning

confidence: 99%

Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System

D’Aléo

Cecchetto

Cola

et al. 2009

Sensors

View full text Add to dashboard Cite

show abstract

“…Vibrational cooling of electronic excited states causes a characteristic temporal evolution of transient spectra that may be monitored by ultrafast spectroscopy. [7][8][9][10][11] Following the discovery of pyrene excimer formation by Fo¨rster and Kasper, 12 pyrenyl groups have played a prominent role as chromophores in covalently linked systems to investigate the dynamics of exciplex formation and electron transfer [13][14][15][16][17][18][19][20][21][22] as well as intramolecular electronic excitation energy transfer (EET) in solution. [23][24][25][26] Recently, we reported on a donor-acceptor system consisting of a rigid s-triazine ring spacer (T) connecting an aminopyrene type donor unit (APy) and an aminobenzanthrone type acceptor unit (ABa), see Scheme 1.…”

Section: Introductionmentioning

confidence: 99%