scholarly journals Long range charge transfer in trimetallic mixed-valence iron complexes mediated by redox non-innocent cyanoacetylide ligands

2014 ◽  
Vol 43 (17) ◽  
pp. 6291-6294 ◽  
Author(s):  
Josef B. G. Gluyas ◽  
Andrew J. Boden ◽  
Samantha G. Eaves ◽  
Herrick Yu ◽  
Paul J. Low
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Long Range ◽  
Mixed Valence ◽  
Iron Complexes ◽  
Redox Active

A redox active 9-atom, 10-bond –CC–CN{Fe(dppx)2}NC–CC– bridge is shown to be effective at promoting electron transfer between metal centres separated by some 15 Å.

scholarly journals Sensitization of ultra-long-range excited-state electron transfer by energy transfer in a polymerized film

2012 ◽  
Vol 109 (38) ◽  
pp. 15132-15135 ◽  
Author(s):  
Akitaka Ito ◽  
David J. Stewart ◽  
Zhen Fang ◽  
M. Kyle Brennaman ◽  
Thomas J. Meyer
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Excited State ◽  
Charge Transfer ◽  
Long Range ◽  
Methyl Viologen ◽  
Polymer Network ◽  
Triplet Energy ◽  
Ligand Charge Transfer ◽  
Triplet Energy Transfer

Distance-dependent energy transfer occurs from the Metal-to-Ligand Charge Transfer (MLCT) excited state to an anthracene-acrylate derivative (Acr-An) incorporated into the polymer network of a semirigid poly(ethyleneglycol)dimethacrylate monolith. Following excitation, to Acr-An triplet energy transfer occurs followed by long-range, Acr-3An—Acr-An → Acr-An—Acr-3An, energy migration. With methyl viologen dication (MV2+) added as a trap, Acr-3An + MV2+ → Acr-An+ + MV+ electron transfer results in sensitized electron transfer quenching over a distance of approximately 90 Å.

scholarly journals Electrical conductivity in two mixed-valence liquids

2015 ◽  
Vol 17 (21) ◽  
pp. 14107-14114 ◽  
Author(s):  
Wenzhi Yao ◽  
Steven P. Kelley ◽  
Robin D. Rogers ◽  
Thomas P. Vaid
Keyword(s):  
Electrical Conductivity ◽  
Electron Transfer ◽  
Exchange Rate ◽  
Rate Constants ◽  
Room Temperature ◽  
Mixed Valence ◽  
Electrical Current ◽  
Active Species ◽  
Redox Active

Two mixed-valence room-temperature liquids are reported: BuFc–[BuFc+][NTf2−] (BuFc = n-butylferrocene) and TEMPO–[TEMPO+][NTf2−]. Both are conductors of DC electrical current, and their conductivity is modeled based on the electron-transfer self-exchange rate constants of their constituent redox-active species.

scholarly journals Efficient long-range electron transfer processes in polyfluorene–perylene diimide blends

Nanoscale ◽  
2018 ◽  
Vol 10 (23) ◽  
pp. 10934-10944 ◽  
Author(s):  
Anna Isakova ◽  
Safakath Karuthedath ◽  
Thomas Arnold ◽  
Jonathan R. Howse ◽  
Paul D. Topham ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Symmetry Breaking ◽  
Long Range ◽  
Perylene Diimide ◽  
Transfer Processes ◽  
Interfacial States ◽  
Donor Acceptor ◽  
Excimer Formation ◽  
Electron Transfer Processes

Symmetry-breaking charge transfer in donor–acceptor blends comprising perylene diimide avoids strongly-bound interfacial states and outperforms excimer formation.

scholarly journals Stereochemical effects on intervalence charge transfer

2008 ◽  
Vol 80 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Deanna M. D'Alessandro ◽  
F. Richard Keene
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Recent Progress ◽  
Mixed Valence ◽  
Intramolecular Electron Transfer ◽  
The Past ◽  
Electronic Delocalization ◽  
Intervalence Charge Transfer ◽  
Electron Transfer Properties ◽  
Transfer Properties

Recent work has revealed the first observation of stereochemical effects on intervalence charge transfer (IVCT) in di- and trinuclear mixed-valence complexes. The differential IVCT characteristics of the diastereoisomers of polypyridyl complexes of ruthenium and osmium offer a new and intimate probe of the fundamental factors that govern the extent of electronic delocalization and the barrier to electron transfer. These findings challenge prior assertions that the inherent stereochemical identity of such complexes would have no influence on the intramolecular electron-transfer properties of polymetallic assemblies. This article provides a brief review of the past 40 years of mixed-valence research and looks at recent progress in stereochemical effects on IVCT. The implications of the findings are considered within the context of the existing theoretical and experimental framework for IVCT.

scholarly journals Mimicking Natural Photosynthesis: Designing Ultrafast Photosensitized Electron Transfer into Multiheme Cytochrome Protein Nanowires

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2143
Author(s):  
Daniel R. Marzolf ◽  
Aidan M. McKenzie ◽  
Matthew C. O’Malley ◽  
Nina S. Ponomarenko ◽  
Coleman M. Swaim ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Model Systems ◽  
Covalent Attachment ◽  
Chemical Labeling ◽  
Covalent Bonds ◽  
Time Resolved ◽  
Redox Active ◽  
Dynamics Simulations ◽  
Ultrafast Charge Transfer

Efficient nanomaterials for artificial photosynthesis require fast and robust unidirectional electron transfer (ET) from photosensitizers through charge-separation and accumulation units to redox-active catalytic sites. We explored the ultrafast time-scale limits of photo-induced charge transfer between a Ru(II)tris(bipyridine) derivative photosensitizer and PpcA, a 3-heme c-type cytochrome serving as a nanoscale biological wire. Four covalent attachment sites (K28C, K29C, K52C, and G53C) were engineered in PpcA enabling site-specific covalent labeling with expected donor-acceptor (DA) distances of 4–8 Å. X-ray scattering results demonstrated that mutations and chemical labeling did not disrupt the structure of the proteins. Time-resolved spectroscopy revealed three orders of magnitude difference in charge transfer rates for the systems with otherwise similar DA distances and the same number of covalent bonds separating donors and acceptors. All-atom molecular dynamics simulations provided additional insight into the structure-function requirements for ultrafast charge transfer and the requirement of van der Waals contact between aromatic atoms of photosensitizers and hemes in order to observe sub-nanosecond ET. This work demonstrates opportunities to utilize multi-heme c-cytochromes as frameworks for designing ultrafast light-driven ET into charge-accumulating biohybrid model systems, and ultimately for mimicking the photosynthetic paradigm of efficiently coupling ultrafast, light-driven electron transfer chemistry to multi-step catalysis within small, experimentally versatile photosynthetic biohybrid assemblies.

Rapid formation of small mixed-valence luminescent silver clusters via cation-coupled electron-transfer in a redox-active porous ionic crystal based on dodecamolybdophosphate

Nanoscale ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 5460-5466 ◽  
Author(s):  
Sayaka Uchida ◽  
Tomoki Okunaga ◽  
Yuki Harada ◽  
Shotaro Magira ◽  
Yasuto Noda ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Ionic Crystal ◽  
Mixed Valence ◽  
Silver Clusters ◽  
Redox Active ◽  
Rapid Formation

Rapid formation of small mixed-valence luminescent silver clusters via cation-coupled electron-transfer by redox-active polyoxometalate-based porous crystals is reported.

Sign in / Sign up

Export Citation Format

Share Document