scholarly journals Using sulfur bridge oxidation to control electronic coupling and photochemistry in covalent anthracene dimers

2019 ◽  
Vol 10 (32) ◽  
pp. 7561-7573 ◽  
Author(s):  
Chad D. Cruz ◽  
Jennifer Yuan ◽  
Clàudia Climent ◽  
Nathan T. Tierce ◽  
Peter R. Christensen ◽  
...  
Keyword(s):  
Excited State ◽  
Oxidation State ◽  
Sulfur Atom ◽  
Sulfur Oxidation ◽  
Electronic Coupling ◽  
Intersystem Crossing ◽  
State Behavior

For anthracene dimers bridged by a sulfur atom, modulating the sulfur oxidation state profoundly affects excited state behavior. The SO2-bridge supports long-lived states and photodimerization, while the S-bridge undergoes intersystem crossing.

Optical and electrochemical properties of ethynylaniline derivatives of phenothiazine, phenothiazine-5-oxide and phenothiazine-5,5-dioxide

2014 ◽  
Vol 16 (24) ◽  
pp. 12266-12274 ◽  
Author(s):  
Kim D. Thériault ◽  
Todd C. Sutherland
Keyword(s):  
Excited State ◽  
Electrochemical Properties ◽  
Oxidation State ◽  
Sulfur Oxidation ◽  
Homo Energy ◽  
Derivatives Of

Modifications in the sulfur oxidation state of phenothiazine results in dramatic changes to the excited-state geometry with little effect on the HOMO energy.

Sulfur-Bridged Terthiophene Dimers: How Sulfur Oxidation State Controls Interchromophore Electronic Coupling

2015 ◽  
Vol 137 (39) ◽  
pp. 12552-12564 ◽  
Author(s):  
Chad D. Cruz ◽  
Peter R. Christensen ◽  
Eric L. Chronister ◽  
David Casanova ◽  
Michael O. Wolf ◽  
...  
Keyword(s):  
Oxidation State ◽  
Sulfur Oxidation ◽  
Electronic Coupling

scholarly journals Controlling ultralong room temperature phosphorescence in organic compounds with sulfur oxidation state

2021 ◽  
Vol 12 (1) ◽  
pp. 188-195
Author(s):  
Zhen Xu ◽  
Clàudia Climent ◽  
Christopher M. Brown ◽  
Duane Hean ◽  
Christopher J. Bardeen ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Oxidation State ◽  
Room Temperature ◽  
Sulfur Oxidation ◽  
Intersystem Crossing ◽  
Room Temperature Phosphorescence ◽  
Lone Pairs ◽  
Orbital Mixing

Sulfur lone pairs in bridged dimers enhance intersystem crossing and phosphorescence through orbital mixing and electrostatic screening.

Spin-Forbidden Excitation Enables Infrared Photoredox Catalysis

2020 ◽  
Author(s):  
Tomislav Rovis ◽  
Benjamin D. Ravetz ◽  
Nicholas E. S. Tay ◽  
Candice Joe ◽  
Melda Sezen-Edmonds ◽  
...  
Keyword(s):  
Excited State ◽  
Ground State ◽  
Intersystem Crossing ◽  
Photoredox Catalysis ◽  
Infrared Irradiation ◽  
Triplet Excitation ◽  
New Family ◽  
Ir Light

We describe a new family of catalysts that undergo direct ground state singlet to excited state triplet excitation with IR light, leading to photoredox catalysis without the energy waste associated with intersystem crossing. The finding allows a mole scale reaction in batch using infrared irradiation.

scholarly journals Thermochromic aggregation-induced dual phosphorescence via temperature-dependent sp3-linked donor-acceptor electronic coupling

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Wang ◽  
Zhubin Hu ◽  
Xiancheng Nie ◽  
Linkun Huang ◽  
Miao Hui ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Electronic Coupling ◽  
Temperature Dependent ◽  
Molecular Systems ◽  
Donor And Acceptor ◽  
Theoretical Investigations ◽  
Donor Acceptor ◽  
And Control ◽  
Two Temperature

AbstractAggregation-induced emission (AIE) has proven to be a viable strategy to achieve highly efficient room temperature phosphorescence (RTP) in bulk by restricting molecular motions. Here, we show that by utilizing triphenylamine (TPA) as an electronic donor that connects to an acceptor via an sp3 linker, six TPA-based AIE-active RTP luminophores were obtained. Distinct dual phosphorescence bands emitting from largely localized donor and acceptor triplet emitting states could be recorded at lowered temperatures; at room temperature, only a merged RTP band is present. Theoretical investigations reveal that the two temperature-dependent phosphorescence bands both originate from local/global minima from the lowest triplet excited state (T1). The reported molecular construct serves as an intermediary case between a fully conjugated donor-acceptor system and a donor/acceptor binary mix, which may provide important clues on the design and control of high-freedom molecular systems with complex excited-state dynamics.

INTERSYSTEM CROSSING OF THE ELECTRONICALLY EXCITED DIDEUTEROETHYLENE MOLECULES FORMED IN BENZENE PHOTOSENSITIZATION

1966 ◽  
Vol 44 (18) ◽  
pp. 2173-2180 ◽  
Author(s):  
Terumi Terao ◽  
Shun-Ichi Hirokami ◽  
Shin Sato ◽  
R. J. Cvetanović
Keyword(s):  
Excited State ◽  
Experimental Evidence ◽  
Rate Constants ◽  
Intersystem Crossing ◽  
Molecular Decomposition ◽  
Electronically Excited

Experimental evidence is presented for a rapidly occurring intersystem crossing of the electronically excited dideuteroethylene molecules initially formed in the benzene-photosensitized reaction at 2 537 Å and 25 °C to another excited state which is responsible for the internal H-atom scrambling. The mechanism is entirely analogous to that previously postulated for the photoexcited states sensitized by Hg(3P1) atoms but the rate constants for intersystem crossing and molecular decomposition are drastically decreased as a result of the smaller amount of energy available for the excitation.

Solvent-Controlled Excited State Behavior:  2-(2‘-Pyridyl)indoles in Alcohols

1996 ◽  
Vol 118 (14) ◽  
pp. 3508-3518 ◽  
Author(s):  
Jerzy Herbich ◽  
Chi-Ying Hung ◽  
Randolph P. Thummel ◽  
Jacek Waluk
Keyword(s):  
Excited State ◽  
State Behavior

Triplet Excited State Behavior of Naphthalene-Based Pseudopeptides in the Presence of Energy Donors

2012 ◽  
Vol 116 (33) ◽  
pp. 9957-9962 ◽  
Author(s):  
Paula Bonancía ◽  
Laura Vigara ◽  
Francisco Galindo ◽  
Santiago V. Luis ◽  
M. Consuelo Jiménez ◽  
...  
Keyword(s):  
Excited State ◽  
Triplet Excited State ◽  
State Behavior
Sign in / Sign up

Export Citation Format

Share Document