(Invited) Tetracene Molecular Architectures for High-Yield and Long-Lived Individual Triplet States through Singlet Fission

2021 ◽  
Vol MA2021-01 (15) ◽  
pp. 726-726
Author(s):  
Taku Hasobe ◽  
Hayato Sakai ◽  
Yasuhiro Kobori ◽  
Nikolai Tkachenko
Keyword(s):  
High Yield ◽  
Triplet States ◽  
Singlet Fission ◽  
Molecular Architectures

scholarly journals Multiple exciton generation in quantum dots versus singlet fission in molecular chromophores for solar photon conversion

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140412 ◽  
Author(s):  
Matthew C. Beard ◽  
Justin C. Johnson ◽  
Joseph M. Luther ◽  
Arthur J. Nozik
Keyword(s):  
Semiconductor Nanocrystals ◽  
Power Conversion ◽  
Photovoltaic Cell ◽  
Solar Fuels ◽  
Triplet States ◽  
Singlet Fission ◽  
Multiple Exciton Generation ◽  
A Cell ◽  
Solar Electricity ◽  
Conversion Efficiencies

Both multiple exciton generation (MEG) in semiconductor nanocrystals and singlet fission (SF) in molecular chromophores have the potential to greatly increase the power conversion efficiency of solar cells for the production of solar electricity (photovoltaics) and solar fuels (artificial photosynthesis) when used in solar photoconverters. MEG creates two or more excitons per absorbed photon, and SF produces two triplet states from a single singlet state. In both cases, multiple charge carriers from a single absorbed photon can be extracted from the cell and used to create higher power conversion efficiencies for a photovoltaic cell or a cell that produces solar fuels, like hydrogen from water splitting or reduced carbon fuels from carbon dioxide and water (analogous to biological photosynthesis). The similarities and differences in the mechanisms and photoconversion cell architectures between MEG and SF are discussed.

scholarly journals Spin Dynamics of Quintet and Triplet States Resulting from Singlet Fission in Oriented Terrylenediimide and Quaterrylenediimide Films

2020 ◽  
Vol 124 (18) ◽  
pp. 9822-9833 ◽  
Author(s):  
Youn Jue Bae ◽  
Xingang Zhao ◽  
Matthew D. Kryzaniak ◽  
Hiroki Nagashima ◽  
Joseph Strzalka ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Triplet States ◽  
Singlet Fission

The radiation-induced formation of excited states of aromatic hydrocarbons in benzene and cyclohexane, II. Yields of excited singlet and triplet state solute molecules

1972 ◽  
Vol 328 (1575) ◽  
pp. 457-479 ◽  
Keyword(s):  
Excited States ◽  
Pulse Radiolysis ◽  
Singlet State ◽  
Relative Yield ◽  
Excited Singlet State ◽  
High Yield ◽  
Triplet States ◽  
Excited Singlet ◽  
Concentration Dependences ◽  
Radiation Induced

The concentration dependences of the yield of excited triplet states, G ( 3 S*), and the concentration dependences of the relative yield of radiation-induced fluorescence obtained on pulse radiolysis of solutions of naphthalene, anthracene, pyrene and 2,5-diphenyloxazole (PPO) are reported. The yields of excited singlet state solute molecules, G ( 1 S*), formed on pulse radiolysis of naphthalene-cyclohexane and naphthalene-benzene solutions has been determined by comparing the intensity of the radiation-induced fluorescence with that obtained on photo-excitation. It is concluded that intersystem crossing (i.s.c.) from the excited singlet state is an important process in the formation of the high yield of triplet excited states of the solute. Under certain conditions this process accounts for up to 50 % of G ( 3 S*) in cyclohexane and the entire G ( 3 S*) in benzene solutions.

scholarly journals Quintet-triplet mixing determines the fate of the multiexciton state produced by singlet fission in a terrylenediimide dimer at room temperature

2019 ◽  
Vol 116 (17) ◽  
pp. 8178-8183 ◽  
Author(s):  
Michelle Chen ◽  
Matthew D. Krzyaniak ◽  
Jordan N. Nelson ◽  
Youn Jue Bae ◽  
Samantha M. Harvey ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Single Photon ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Spin Dynamics ◽  
High Yield ◽  
Resonance Spectroscopy ◽  
Singlet Fission ◽  
Photophysical Process ◽  
Time Resolved

Singlet fission (SF) is a photophysical process in which one of two adjacent organic molecules absorbs a single photon, resulting in rapid formation of a correlated triplet pair (T1T1) state whose spin dynamics influence the successful generation of uncorrelated triplets (T1). Femtosecond transient visible and near-infrared absorption spectroscopy of a linear terrylene-3,4:11,12-bis(dicarboximide) dimer (TDI2), in which the two TDI molecules are directly linked at one of their imide positions, reveals ultrafast formation of the (T1T1) state. The spin dynamics of the (T1T1) state and the processes leading to uncoupled triplets (T1) were studied at room temperature for TDI2aligned in 4-cyano-4′-pentylbiphenyl (5CB), a nematic liquid crystal. Time-resolved electron paramagnetic resonance spectroscopy shows that the (T1T1) state has mixed5(T1T1) and3(T1T1) character at room temperature. This mixing is magnetic field dependent, resulting in a maximum triplet yield at ∼200 mT. The accessibility of the3(T1T1) state opens a pathway for triplet–triplet annihilation that produces a single uncorrelated T1state. The presence of the5(T1T1) state at room temperature and its relationship with the1(T1T1) and3(T1T1) states emphasize that understanding the relationship among different (T1T1) spin states is critical for ensuring high-yield T1formation from singlet fission.

scholarly journals Microfluidic light-driven synthesis of tetracyclic molecular architectures

2018 ◽  
Vol 14 ◽  
pp. 2418-2424 ◽  
Author(s):  
Javier Mateos ◽  
Nicholas Meneghini ◽  
Marcella Bonchio ◽  
Nadia Marino ◽  
Tommaso Carofiglio ◽  
...  
Keyword(s):  
Reaction Time ◽  
Biologically Active ◽  
High Yield ◽  
Synthetic Method ◽  
Cycloaddition Reactions ◽  
Direct Assembly ◽  
Molecular Architectures

Herein we report an effective synthetic method for the direct assembly of highly functionalized tetracyclic pharmacophoric cores. Coumarins and chromones undergo diastereoselective [4 + 2] cycloaddition reactions with light-generated photoenol intermediates. The reactions occur by aid of a microfluidic photoreactor (MFP) in high yield (up to >98%) and virtually complete diastereocontrol (>20:1 dr). The method is easily scaled-up to a parallel setup, furnishing 948 mg of product over a 14 h reaction time. Finally, a series of manipulations of the tetracyclic scaffold obtained gave access to valuable precursors of biologically active molecules.

scholarly journals Direct Observation of a Charge-Transfer State Preceding High-Yield Singlet Fission in Terrylenediimide Thin Films

2016 ◽  
Vol 139 (2) ◽  
pp. 663-671 ◽  
Author(s):  
Eric A. Margulies ◽  
Jenna L. Logsdon ◽  
Claire E. Miller ◽  
Lin Ma ◽  
Ethan Simonoff ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Direct Observation ◽  
Charge Transfer State ◽  
High Yield ◽  
Singlet Fission ◽  
A Charge ◽  
Transfer State

scholarly journals Design of carborane molecular architectures with electronic structure computations: From endohedral and polyradical systems to multidimensional networks

2009 ◽  
Vol 81 (4) ◽  
pp. 719-729 ◽  
Author(s):  
Josep M. Oliva ◽  
Douglas J. Klein ◽  
Paul von Ragué Schleyer ◽  
Luis Serrano-Andrés
Keyword(s):  
Electronic Structure ◽  
Quantum Chemical ◽  
Triplet States ◽  
Triplet Energy ◽  
Self Assembling ◽  
Energy Gaps ◽  
Molecular Architectures ◽  
High Level ◽  
Quantum Chemical Computations ◽  
Structure Properties

The 12 cage-anchoring points of the very stable icosahedral ortho-, meta-, and para-carborane allow the design of multidimensional architectures provided new self-assembling routes are devised. We provide bases for constructing carborane molecular architectures through high-level quantum chemical computations. We consider ejection mechanisms for the inner atom/ion in endohedral carborane complexes, singlet-triplet energy gaps in carborane biradicals, as well as geometry reorganization in carborane neutral and dianionic triplet states. These features, explored in monomers, are starting points for the design of molecular architectures based on electronic structure properties of carborane assemblies.

Sign in / Sign up

Export Citation Format

Share Document