The triplet state of anthracene in liquid solutions

Livingston, Robert; Tanner, D. W.

doi:10.1039/tf9585400765

Cited by 39 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The energy levels of these triplet RP states are above those of 3 *An and 3 *NI, so that spin-selective CR can occur from the triplet RPs to produce (DMJ-An-FN n -3 *NI) and (DMJ-An-PE n P-3 *NI) (E T = 2.03 eV), [15] as well as (DMJ-3 *An-FN n -NI) and (DMJ-3 *An-PE n P-NI), respectively (E T = 1.85 eV). [16] For spin-selective CR to 3 *NI and 3 *An, the broad absorption features at 480 nm and 430 nm [17] persist on the microsecond timescale and appear as plateaus in the kinetic traces (Figure 2, insets). The decay-associated spectra for the FN 2 and PE 2 P bridges indicate that CR to both 3 *An and 3 *NI is limited by the lifetimes of their RPs ( Figure S2 in the Supporting Information).…”

mentioning

confidence: 99%

Comparing Spin‐Selective Charge Transport through Donor–Bridge–Acceptor Molecules with Different Oligomeric Aromatic Bridges

Scott¹,

Ricks²,

Colvin³

et al. 2010

Angew Chem Int Ed

View full text Add to dashboard Cite

Burning bridges: The exponential distance dependence (β value) of singlet and triplet charge recombination (CR) pathways is determined for three donor-bridge-acceptor (DBA) molecules. p-Phenylethynylene and fluorenone bridges have similar β values, which differ significantly from those of p-phenylene bridges, thus implying that β for both singlet and triplet CR is system-dependent, not bridge-specific.

show abstract

mentioning

confidence: 99%

Comparing Spin‐Selective Charge Transport through Donor–Bridge–Acceptor Molecules with Different Oligomeric Aromatic Bridges

Scott¹,

Ricks²,

Colvin³

et al. 2010

Angew Chem Int Ed

View full text Add to dashboard Cite

show abstract

“…The concentration dependence is due to 3 An-3 An, triplet-triplet annihilation, Eq. 7 (30,31). Its appearance demonstrates the existence of a pathway for long-range, (Fig.…”

Section: Resultsmentioning

confidence: 99%

Sensitization of ultra-long-range excited-state electron transfer by energy transfer in a polymerized film

Ito

Fang

Brennaman

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Distance-dependent energy transfer occurs from the Metal-toLigand Charge Transfer (MLCT) excited state RuðbpyÞ 3 2þÃ to an anthracene-acrylate derivative (Acr-An) incorporated into the polymer network of a semirigid poly(ethyleneglycol)dimethacrylate monolith. Following excitation, RuðbpyÞ 3 2þÃ to Acr-An triplet energy transfer occurs followed by long-range, Acr-3 An-Acr-An → Acr-An-Acr-3 An, energy migration. With methyl viologen dication (MV 2þ ) added as a trap, Acr-3 An þ MV 2þ → Acr-An þ þ MV þ electron transfer results in sensitized electron transfer quenching over a distance of approximately 90 Å.luminescence | time-resolved spectroscopy | polymer matrix M olecular level electron and energy transfer in rigid and semirigid media are important in applications from imaging to electron transfer in biological membranes (1-4). In photosystem II, the chlorophyll singlet excited state 1 P 680 Ã is formed by light absorption by an antenna complex followed by highly efficient long-range energy transfer sensitization (5). Oxidative quenching of 1 P 680 Ã is followed by electron transfer activation of the Oxygen Evolving Complex (OEC) where water is oxidized to oxygen.Although well understood in solution (6-10), molecular level electron and energy transfer are less well understood in rigid media where diffusion is inhibited and reaction barriers significantly altered (11). There is theoretical (12, 13) and experimental insight into both processes in rigid media with the latter studied largely in low temperature glasses and, to a lesser extent, in plastics and polymeric films (14-17). Important fundamental issues remain to be elucidated along with the possible exploitation of randomly oriented, fixed site geometries in local and long-range electron and energy transfer applications.Poly(ethyleneglycol)dimethacrylate (PEG-DMA) films and monoliths, Fig. 1A, or photochemical polymerization under mild conditions (21, 22) to give optically transparent materials with features conformable to the nanoscale. They have proven useful in exploring medium effects on the properties of Metal-to-Ligand Charge Transfer (MLCT) excited states (23). Here, we report the use of a MLCT excited state in demonstrating sensitized electron transfer induced by ultralong-range energy transfer over a distance of approximately 90 Å.Structures relevant to the study are shown in Fig. 1A. They include the PEG-DMA derivative with n ¼ 9 (PEG-DMA550), the salt ½RuðbpyÞ 3 ðPF 6 Þ 2 , (bpy is 2,2′-bipyridine), and an acrylate derivative of anthracene (Acr-An). The acrylate tail allows the energy and electron transfer active anthracene group to be incorporated into the polymer network as it forms. Fig. 1 B and C show corrected emission spectra and emission decay profiles, respectively, for RuðbpyÞ 3 2þÃ with and without added Acr-An in poly-PEG-DMA550. The data provide clear evidence for emission quenching by Acr-An. Emission intensity measurements show that quenching was 55% complete with 300 mM AcrAn in the initial solution. Time-resolved emission measure...

show abstract

“…Most of the reported systems have been studied by the triplet-triplet absorption technique, with oxygen concentrations considerably above those used here. [24][25][26] If the static model is satisfactory for the dye-gel adsorbate reported here, why is it not appropriate for fluid media? One possible explanation is that the ground-state dye-oxygen complex might be too unstable in fluid media.…”

Section: S-02*-^s + 02* (4)mentioning

confidence: 99%