Extinction coefficients for triplet-triplet absorption in ethanol solutions of anthracene, naphthalene, 2,5-diphenyloxazole, 7-diethylamino- 4-methyl coumarin and 4-methyl-7-amino-carbostyril

Dempster, D. N.; Morrow, Thomas; Quinn, Michael

doi:10.1016/0047-2670(73)80031-0

Cited by 58 publications

(5 citation statements)

References 12 publications

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“…Over the course of the next several hundred nanoseconds, a new absorption band, centered at 435 nm, appears in concert with the decrease in the Ru(bpy) 3 2+ * bleach. The new feature is consistent with triplet–triplet (T–T) absorption in PEG- 3 An with λ max = 420 nm in ethanol for 3 An …”

Section: Resultssupporting

confidence: 73%

Excited-State Dynamics in Rigid Media: Evidence for Long-Range Energy Transfer

et al. 2013

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In semirigid PEG-DMA550 films with the added anthracene derivatives PEG-An and Acr-An, energy transfer quenching of the metal-to-ligand charge transfer excited state Ru(bpy)3(2+)* to give -(3)An occurs by both rapid, static, and slow, diffusional quenching processes. The appearance of -(3)An was verified by transient absorption measurements. The kinetics of the two quenching processes have been analyzed by a Stern-Volmer kinetic analysis. The data for static quenching are consistent with energy transfer quenching with a distance dependence consistent with Dexter (exchange) energy transfer. On the basis of this analysis Bohr radii were found to be 26 and 11 Å for PEG-An and Acr-An, respectively. Evidence for triplet-triplet annihilation between triplet anthracene excited states in the films was obtained from the concentration dependences of excited-state decay. These results provide evidence for long-range energy migration between derivatized anthracenes in rigid, cross-linked PEG-DMA550 films.

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Section: Resultssupporting

confidence: 73%

Excited-State Dynamics in Rigid Media: Evidence for Long-Range Energy Transfer

et al. 2013

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“…A high energy band at 340 nm as well as a strong band at 500 nm indicate that a different type of excited state is probed, which is supported by the prolonged excited state lifetime of 210 ns. No emission or excited state absorption due to anthracene is observed. , Considering this, these data are consistent with a ligand-centered charge transfer (LCCT) state. Two potential electron configurations involve oxidation of the arylethylene and reduction of either the bpy or the second arylethylene.…”

Section: Resultsmentioning

confidence: 99%

Nature of Excited States of Ruthenium-Based Solar Cell Dyes in Solution: A Comprehensive Spectroscopic Study

et al. 2015

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The photophysical properties of a number of ruthenium complexes of the general structure [Ru(L1)(L2)(NCS)2], related to the prominent solar cell dye [Ru(dcb)2(NCS)2] (dcb = 4,4'-dicarboxylato-2,2'-bipyridine) are investigated. For L1 = dcb and dmb (dmb = 4,4'-dimethyl-2,2'-bipyridine), several variations of L2 show very little difference in the lowest energy absorption peak. Resonance Raman and density functional theory calculations have been used to assign the corresponding transitions as {Ru(NCS)2} → dcb with significant contributions of the NCS ligands. Transient absorption, time-resolved infrared, and transient resonance Raman spectroscopic techniques were used to probe the photophysics of the complexes and relatively short-lived {Ru(NCS)2} → dcb/dpb (dpb = 4,4'-diphenylethenyl-2,2'-bipyridine) excited states were observed with the exception of [Ru(dcb)(dab)(NCS)2] (dab = 4,4'-dianthracenethenyl-2,2'-bipyridine), which showed a long-lived excited state assigned as ligand centered charge separated.

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“…The value of ε T 1 T n determined for 6AC is smaller than the values for 7-aminocoumarin derivatives (C151, C120, C102, C153, C1, C1F). 14,15,[46][47][48][49] The highest ϕ S 1 T 1 values were obtained for 6AC in 1-RCl, and they decrease slightly with the 1-RCl polarity increase. Lower values of ϕ S 1 T 1 were measured in CCl 4 and ACN.…”

Section: Photophysical Studiesmentioning

confidence: 90%