Remote control of electronic coupling – modification of excited-state electron-transfer rates in Ru(tpy)2-based donor–acceptor systems by remote ligand design

2019 ◽  
Vol 55 (16) ◽  
pp. 2273-2276 ◽  
Author(s):  
Yusen Luo ◽  
Jens H. Tran ◽  
Maria Wächtler ◽  
Martin Schulz ◽  
Kevin Barthelmes ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Remote Control ◽  
Ligand Design ◽  
Electronic Coupling ◽  
Transfer Rates ◽  
State Electron ◽  
Donor Acceptor

Electronic coupling (HDA) underlying the electron transfer (ET) can be tuned by the remote substituents R.

scholarly journals Effect of extending conjugation via thiophene-based oligomers on the excited state electron transfer rates to ZnO nanocrystals

2019 ◽  
Vol 21 (13) ◽  
pp. 6991-6998 ◽  
Author(s):  
Amanda N. Oehrlein ◽  
Antonio Sanchez-Diaz ◽  
Philip C. Goff ◽  
Miquel Planells ◽  
Neil Robertson ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Transfer Rates ◽  
Zno Nanocrystals ◽  
State Electron

Despite spectral differences of a series of thiophene dyes, their excited state electron transfer rates to ZnO nanocrystals are similar.

Effects of a phosphonate anchoring group on the excited state electron transfer rates from a terthiophene chromophore to a ZnO nanocrystal

2017 ◽  
Vol 19 (35) ◽  
pp. 24294-24303 ◽  
Author(s):  
Amanda N. Oehrlein ◽  
Antonio Sanchez-Diaz ◽  
Philip C. Goff ◽  
Gretchen M. Ziegler ◽  
Ted M. Pappenfus ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Transfer Rates ◽  
Zno Nanocrystals ◽  
State Electron ◽  
Anchoring Group ◽  
Zno Nanocrystal

Relative to carboxyl-anchored chromophores, phosphonate-anchored dyes are bound more strongly but slow the excited state electron transfer to ZnO nanocrystals.

Corrole–ferrocene and corrole–anthraquinone dyads: synthesis, spectroscopy and photochemistry

2015 ◽  
Vol 17 (40) ◽  
pp. 26607-26620 ◽  
Author(s):  
Jaipal Kandhadi ◽  
Venkatesh Yeduru ◽  
Prakriti R. Bangal ◽  
Lingamallu Giribabu
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Charge Recombination ◽  
Transfer Rates ◽  
Donor Acceptor

Two different donor–acceptor systems based on corrole–ferrocene (Cor–Fc) and corrole–anthraquinone (Cor–AQ) have been designed and synthesized. Excited state properties of these dyads indicates intramolecular photoinduced electron transfer (PET) take place in these dyads and the electron-transfer rates (kET) was found to be ∼1011s−1. The charge separation (CS) and charge recombination (CR) are found to be identical.

Intramolecular electron transfer in porphyrin-anthraquinone donor–acceptor systems with varying molecular bridges

2019 ◽  
Vol 23 (06) ◽  
pp. 628-638 ◽  
Author(s):  
Naresh Duvva ◽  
A. R. Ramya ◽  
Govind Reddy ◽  
L. Giribabu
Keyword(s):  
Electron Transfer ◽  
Ground State ◽  
Computational Analysis ◽  
Solvent Polarity ◽  
Electronic Coupling ◽  
Intramolecular Electron Transfer ◽  
Ether Linkage ◽  
Transfer Rates ◽  
Donor Acceptor ◽  
Ester Linkage

Photoinduced electron transfer has been investigated in porphyrin anthraquinone (ZnTTP-AQ) donor–acceptor dyads having either ester (ZnTTP-AQ1) or ether (ZnTTP-AQ2) linkages. Both dyads were characterized by spectroscopic and electrochemical methods. Absorption spectra show absence of any ground state interaction between the porphyrin and anthraquinone moieties. The quenched fluoresence and lifetime indicate electron transfer from the porphyrin to the anthraquinone moiety. The quenching is more pronounced in ZnTTP-AQ1 with ester linkage, suggesting efficient electronic coupling compared to the ether linkage in ZnTTP-AQ2. Computational analysis and frontier molecular orbitals confirmed the formation of charged separated state por[Formula: see text]AQ[Formula: see text]. The electron transfer rates ([Formula: see text] of these triads are found in the range 0.43 × 108 to 10.52 × 109 s[Formula: see text] and are found to be solvent polarity dependent.

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.

Light-Triggered Switching of Quantum Dot Photoluminescence through Excited-State Electron Transfer to Surface-Bound Photochromic Molecules

Nano Letters ◽  
2021 ◽  
Author(s):  
Suyog Padgaonkar ◽  
Christopher T. Eckdahl ◽  
Jakub K. Sowa ◽  
Rafael López-Arteaga ◽  
Dana E. Westmoreland ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Quantum Dot ◽  
State Electron ◽  
Photochromic Molecules
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