Triplet state formation efficiency of 9, 10-diphenyl anthracene. by Safaa Salih Al-Omar

Cover of: Triplet state formation efficiency of 9, 10-diphenyl anthracene. | Safaa Salih Al-Omar

Published by University of East Anglia in Norwich .

Written in English

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Thesis (Ph.D.) - University of East Anglia, School of Chemical Sciences, 1977.

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Open LibraryOL13845684M

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A series of tetraphenylethene 9,10‐diphenylanthracene (TPE‐DPA) derivatives have been synthesized, and their photophysical properties studied. Photoluminescence measurements in PMMA, neat films and nanoparticle dispersions reveal that different aggregation states are formed, which leads to different photophysical by: 5.

Triplet State Formation Efficiency of 9, 10 - Diphenyl Anthracene. Author: Al-Omar, S. Unsubstituted anthracene has a fluorescence quantum yield of about 30%, a consequence of the high intersystem crossing rate and a triplet yield of approximately 70%.

22 Substituting anthracene at the 9- and positions can drastically alter the probability of these transitions, e.g. 9,dimethylanthracene 10-diphenyl anthracene. book a fluorescence quantum yield of about 70% 23 and has been successfully used in triplet–triplet annihilation systems Cited by:   Bodipy–Anthracene Dyads as Triplet Photosensitizers: Effect of Chromophore Orientation on Triplet-State Formation Efficiency and Application in Triplet–Triplet Annihilation Upconversion.

Organic Letters19 (17), DOI: /t.7bCited by: First published on 13th October The synthesis and photophysical characterization of a palladium(II) porphyrin – anthracene dyad bridged via short and conformationally rigid bicyclo[]octadiene spacer were achieved.A spectroscopic investigation of the prepared molecule in solution has been undertaken to study electronic energy transfer in excited singlet and triplet states between Cited by: 5.

Using 9,di(naphthyl)anthracene (ADN) and its tertiary butyl derivative, 2-t-butyl-9,di-(2-naphthyl) anthracene as emitters, Tang et al.

reported blue emissions with good chromaticity and luminance efficiency of cd A −1 corresponding to the CIE coordinates of (, ) and a half-lifetime of 4, hr with an initial light. Pizzoferrato et al. 9-bromo(4-methoxyphenyl)anthracene: 1 g ( × 10−3 mol) of 9,10dibromoanthracene was dissolved - in 20 ml of toluene and g (× 10−3 mol) of 4methoxyphenyl boronic acid were added.

To the obtained - mixture, 20 mg of Pd(AcO) 2, 40 mg of triphenylphosphine and 5 ml of a 1 M Na 2CO 3 solution were added. The. Laquai et al. 9 also reported Triplet state formation efficiency of 9 PSBTBT:PC 60 BM blends (with a silicon atom bridgehead) show a higher charge generation efficiency, but less triplet state formation at similar free charge carrier concentrations.

The film morphology of the two blends are similar in terms of crystallinity, phase segregation, and interfacial contacts. The absorption maximum of the triplet state of the anthracene moiety (– nm) may be obscured by the intense Soret band of the porphyrin.

Attempts were made to observe depletion of the anthracene absorption resulting from triplet state formation at nm, where the porphyrin does not absorb excessively. However, these were inconclusive. 9,diphenylanthracene is a member of the class of anthracenes that is anthracene in which both of the hydrogens on the central ring are substituted by phenyl groups.

It has a role as a fluorochrome and a photosensitizing agent. The excited triplet- singlet- and ground-state properties as well as singlet oxygen generation capability of four brominated BODIPY dyes were measured in toluene with laser flash photolysis, fluorescence spectroscopy, time-correlated single-photon counting, and absorption spectroscopy.

The triplet–triplet (T1–Tn) absorption spectra were identified for four dyes 1B, 2B, 4B. Production of triplet excited states of π-conjugated organic molecules in high yields without using heavy atoms remains challenging. The direct formation of triplet excited states from singlet charge-separated states is a promising approach.

Here, we show that spin-allowed electron-transfer reactions largely control such a formation, yet the spin-forbidden transition can outcompete the spin. The triplet state energy level of the natural cis-carotenoid bixin (methyl hydrogen 9′Z-6,6′-diapocarotene-6,6′-dioate) was determined using laser-induced photoacoustic calorimetry (PAC) in acetonitrile/methanol () energy-transfer process with anthracene as sensitizer in O 2-saturated solution was used to populate the carotenoid triplet state.

Bodipy–Anthracene Dyads as Triplet Photosensitizers: Effect of Chromophore Orientation on Triplet-State Formation Efficiency and Application in Triplet–Triplet Annihilation Upconversion. Organic Letters19 (17), DOI: /t.7b   Bodipy–Anthracene Dyads as Triplet Photosensitizers: Effect of Chromophore Orientation on Triplet-State Formation Efficiency and Application in Triplet–Triplet Annihilation Upconversion.

Organic Letters19 (17), DOI: /t.7b   Zhijia Wang, Jianzhang Zhao, Bodipy–Anthracene Dyads as Triplet Photosensitizers: Effect of Chromophore Orientation on Triplet-State Formation Efficiency and Application in Triplet–Triplet Annihilation Upconversion, Organic Letters.

10,10'-Diphenyl-9,9'-bianthracene | C40H26 | CID - structure, chemical names, physical and chemical properties, classification, patents, literature. Recently we have measured the triplet state of anthracene itself (∼ eV or nm).

The reduction of the triplet state energy of the anthracene derivative, 8 d, is fully in line with the anthracene measurement and clearly reflects the conjugated substituents on the anthracene in 8 d aiding a more delocalised triplet state.

Herein, we modified anthracene moiety of Bodipy-anthracene dyad with the phenylethynyl group (BDP-An, Scheme 1), in order to tune the energy levels and the triplet state quantum hysical properties of BDP-An were studied with steady-state and time-resolved transient spectroscopies, electrochemistry as well as theoretical calculations.

To verify SOCT-ISC mechanism. Request PDF | OnDamir Dzebo and others published Intramolecular Triplet-Triplet Annihilation Upconversion in 9,Diphenylanthracene Oligomers and Dendrimers | Find, read and cite.

Google Scholar. Bäckstrom, H. J., and Sandros, K.,The quenching of the long-lived fluorescence of biacetyl in solution, Acta. Chem. Scand. – Google Scholar. Beckett, A., and Porter, G.,Primary photochemical processes in aromatic molecules. Part 9. Bilayer solid-state show low efficiency thresholds of mW/cm2, however, suffer detrimental effects from parasitic low-energy excimer formation.

9, 10–diphenyl anthracene with. Taking into account previous findings on triplet excited state relaxation channels, 33 this confirms that triplet–triplet annihilation between two anthracene localized triplet states takes place, which results in the formation of a singlet excited state of anthracene: Por-b-3.

This is consistent with the reported bimolecular quenching constant k Q = × 10 10 M −1 s −1 of singlet excited state of anthracene by TEMPO. 11 For An we attempted to correlate the efficiency of formation of the CT state to the length separating the two moieties.

Pyrene Fluorescence Quenching and Triplet-state Formation in the. Experiments in which known triplet state scavengers (e.g., O2, anthracene) were added suggested that the triplet state of benzene was the main agent of the isomerization, and the concentration.

9,DIPHENYL-9,DIHYDRO-ANTHRACENE-9,DIOL AldrichCPR; Linear Formula: C26H20O2; find null-S MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich. S1, has the same energy level as an upper vibrational level of the triplet state.

Direct transition from the ground state, usually a singlet state, for a molecule with an even number of electrons, to an excited triplet state is theoretically forbidden, which means that the reverse transition from triplet to ground state will be difficult.

A fabricated device using 2-(biphenylyl)-9,di(naphthaleneyl)anthracene as an emitting material exhibits a maximum quantum efficiency of % (power efficiency of lm/W, current.

Quantity Value Units Method Reference Comment; Δ sub H°: ± kJ/mol: Review: Roux, Temprado, et al., There are insufficient literature values to properly evaluate the data and insufficient information to construct thermochemical cycles or estimate values for comparison, and one must rely solely upon reported uncertainities and the quality of the measurements.

The rate of decay of the triplet state of anthracene, dissolved in hexane, tetrahydrofuran, and glycerol, has been measured at temperatures ranging from 30 to —70°C.

In fluid solvents at ordinary temperatures, the decay appears to be chiefly the result of bimolecular triplet-triplet interaction and of a bimolecular quenching reaction involving an unknown quencher, present in trace amounts.

An ECL mechanism based on the formation of the CT excited state by radical ion annihilation or production of the triplet state followed by triplet-triplet annihilation, with perhaps some excimer.

Quantity Value Units Method Reference Comment; Δ f H° solid: ± kJ/mol: Review: Roux, Temprado, et al., There are insufficient literature values to properly evaluate the data and insufficient information to construct thermochemical cycles or estimate values for comparison, and one must rely solely upon reported uncertainities and the quality of the measurements.

@article{osti_, title = {Energy transfer from triplet acetophenones to 9,dibromoanthracene (S/sub 1/): role of its T/sub n/ state}, author = {Catalani, L H and Wilson, T}, abstractNote = {The efficiency of energy transfer to 9,dibromoanthracene (S/sub 1/) (DBA, x 10/sup -4/ M) from triplet acetophenone, methyl-substituted acetophenones, and indanone (1) ( M, E/sub T.

A long-lived triplet excited state of the well-known fluorophore boron dipyrromethene (Bodipy) was observed for the first time via efficient radical-enhanced intersystem crossing (EISC). The triplet state has been obtained in two dyads in which the Bodipy unit is linked to a nitroxide radical, 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO), with two different length spacers.

A study has been made of the electronic transitions between the lowest triplet state of anthracene and its ground state. Low‐temperature spectroscopic study of the phosphorescence revealed a sharp emission band with a 0,0‐frequency (T→S) at 14 cm—1 (EPA rigid glass solution at 77°K).

A vibrational analysis in terms of known Raman frequencies indicates that the transition is of a u. Other names: DPA; 9,Diphenylanthracene Permanent link for this species. Use this link for bookmarking this species for future reference.

Information on this page: Notes; Other data available: Gas phase thermochemistry data; Condensed phase thermochemistry data; Phase change data; Mass spectrum (electron ionization) UV/Visible spectrum; Gas. Using [18 O]-labeled triplet, ground state molecular oxygen [18 O 2 (3 Σ g-)], chemical trapping of 18 O 2 (1 Δ g) with disodium salt of anthracene-9,diyldiethane-2,1-diyl disulfate yielding the corresponding double-[18 O]-labeled 9,endoperoxide, was detected through mass spectrometry.

The relationship between structure and upconversion performance of four anthracene‐based acceptors, named as anthracene (An), 9,10‐diphenylanthracene (DPA), 9,10‐di(naphthalen‐1‐yl)anthracene (DNACl) and 9,10‐di(naphthalen‐1‐yl)anthracene‐2‐carbonitrile (DNACN), doped with Pd(II)tetraphenylporphyrin (PdTPP) was studied.

Decay times (in ps) belonging to the various species are (*S1), (*CT), 60 (CT), and ns (T). FC species is not shown. (d) Relative triplet and charge transfer state formation efficiency as functions of laser fluence for the COARSE and.

Heavy atom-free BODIPY-anthracene dyads (BADs) generate locally excited triplet states by way of photoinduced electron transfer (PeT), followed by recombination of the resulting charge-separated states (CSS).

Subsequent quenching of the triplet states by molecular oxygen produces singlet oxygen (1O2), which reacts with the anthracene moiety yielding highly fluorescent species.

We present a model to describe collective features of singlet fission in molecular crystals and analyze it using many-body theory. The model we develop allows excitonic states to delocalize over several chromophores which is consistent with the character of the excited states in many molecular crystals, such as the acenes, where singlet fission occurs.Quantity Value Units Method Reference Comment; Δ f H° gas: ± kJ/mol: Review: Roux, Temprado, et al., There are insufficient literature values to properly evaluate the data and insufficient information to construct thermochemical cycles or estimate values for comparison, and one must rely solely upon reported uncertainities and the quality of the measurements.Although the triplet states of graphene undoubtedly are complex, two features connected to triplet-state antiaromaticity can be important for the understanding of graphene photochemistry.

First, for PAHs such as anthracene, pyrene, chrysene and triphenylene, T 1 antiaromaticity localizes to a single or a few rings (Fig.

3 and Supplementary.

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