Switching between coherent and incoherent singlet fission via solvent-induced symmetry-breaking.

08:00 EDT 11th October 2019 | BioPortfolio

Summary of "Switching between coherent and incoherent singlet fission via solvent-induced symmetry-breaking."

Singlet fission in organic semiconductors causes a singlet exciton to decay into a pair of triplet excitons and holds potential for increasing the efficiency of photovoltaic devices. In this combined experimental and theoretical study, we reveal that a covalent dimer of the organic semiconductor tetracene undergoes activated singlet fission by qualitatively different mechanisms depending on the solvent environment. We show that intramolecular vibrations are an integral part of this mechanism, giving rise to mixing between charge transfer and triplet pair excitations. Both coherent or incoherent singlet fission can occur, depending on transient solvent-induced energetic proximity between the states, giving rise to complex variation of the singlet fission mechanism and timescale in the different environments. Our results suggest a more general principle for controlling the efficiency of photochemical reactions by utilizing transient interactions to tune the energetics of reactant and product states and switch between incoherent and coherent dynamics.


Journal Details

This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126


DeepDyve research library

PubMed Articles [11298 Associated PubMed Articles listed on BioPortfolio]

Singlet-triplet Fission of Carotenoid Excitation in the Purple Phototrophic Bacteria Thermochromatium tepidum.

Singlet fission of carotenoid excitation is studied in purple phototrophic bacterium Thermochromatium tepidum. Using time-resolved EPR and magnetic field-induced modulation of fluorescence yield it is...

First Principle Prediction of Intramolecular Singlet Fission and Triplet Triplet Annihilation Rates.

Intramolecular singlet fission and triplet-triplet annihilation (TTA) has been experimentally observed and reported. However, problems remain in theoretically accounting for the corresponding intramol...

Singlet Fission from Upper Excited Electronic States of Cofacial Perylene Dimer.

Singlet fission directly from upper excited vibrational and electronic states of cofacial perylene dimers bypassing the relaxed state S1 was detected within 50 fs. This process competes well with vibr...

Anisotropic Singlet Fission in Single Crystalline Hexacene.

Singlet fission is known to improve solar energy utilization by circumventing the Shockley-Queisser limit. The two essential steps of singlet fission are the formation of a correlated triplet pair and...

Tuning Spin Dynamics in Crystalline Tetracene.

Tetracene is the archetypal material undergoing singlet fission - the generation of a pair of triplet excitons from one singlet exciton. Here, using time-resolved electron spin resonance, we show how ...

Clinical Trials [3298 Associated Clinical Trials listed on BioPortfolio]

Sodium Pertechnetate (99Tc) Injection Generator: 99mTc From Neutron-activation 99Mo v 99mTc From Fission 99Mo

A non-fission sourced, solvent generator produced 99mTc intravenous injection, as 99mTc -MDP, is to be used as a bone scan diagnostic radiopharmaceutical for assessment of bone pathology u...

The Effect of Solvent Usage on Post-treatment Pain

No clinical evidence has been yet published regarding the comparison of postoperative pain after removal of the root canal fillings with or without solvent. The aim of this study was to ev...

Targeting Mitochondrial Fusion and Fission to Prevent Atherosclerosis: Getting the Balance Right

Our preliminary data suggests that pharmacological inhibition of the mitochondrial fission protein, Drp1, reduced atherosclerotic plaque volume and attenuated macrophage accumulation withi...

Efficacy and Safety of Fibrin Sealant Vapor Heated Solvent/Detergent Treated (FS VH S/D) for Hemostasis in Subjects Undergoing Total Hip Replacement

The purpose of the study is to monitor the safety of FS VH S/D and evaluate whether FS VH S/D is superior to standard treatment in reducing blood loss in subjects undergoing total hip repl...

Changes in Hyperprolactinemia Secondary to Antipsychotics After Switching to Quetiapine

Hyperprolactinaemia is a common side effect of some antipsychotics (APS), including some atypicals. Clinical consequences of hyperprolactinaemia are broad including amenorrhea, galactorrhe...

Medical and Biotech [MESH] Definitions

An excited state of molecular oxygen generated photochemically or chemically. Singlet oxygen reacts with a variety of biological molecules such as NUCLEIC ACIDS; PROTEINS; and LIPIDS; causing oxidative damages.

Gene rearrangement of the B-lymphocyte which results in a substitution in the type of heavy-chain constant region that is expressed. This allows the effector response to change while the antigen binding specificity (variable region) remains the same. The majority of class switching occurs by a DNA recombination event but it also can take place at the level of RNA processing.

The pressure required to prevent the passage of solvent through a semipermeable membrane that separates a pure solvent from a solution of the solvent and solute or that separates different concentrations of a solution. It is proportional to the osmolality of the solution.

Devices containing fissionable material in sufficient quantity and so arranged as to be capable of maintaining a controlled, self-sustaining NUCLEAR FISSION chain reaction. They are also known as atomic piles, atomic reactors, fission reactors, and nuclear piles, although such names are deprecated. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Abnormally high temperature intentionally induced in living things regionally or whole body. It is most often induced by radiation (heat waves, infra-red), ultrasound, or drugs.

Quick Search

DeepDyve research library

Searches Linking to this Article