scholarly journals Ultrafast and long-time excited state kinetics of an NIR-emissive vanadium(III) complex II. Elucidating Triplet-to-Singlet Excited-State Dynamics

2021 ◽  
Author(s):  
Patrick Zobel ◽  
Thomas Knoll ◽  
Leticia Gonzalez
Keyword(s):  
Excited State ◽  
Transition Metal ◽  
Electronic Configuration ◽  
Singlet Excited State ◽  
Complex Ii ◽  
The Earth ◽  
Earth Abundant ◽  
Long Time ◽  
Adiabatic Dynamics ◽  
Kinetics Of

We report the non-adiabatic dynamics of VIIICl3(ddpd), a complex based on the Earth-abundant first-row transition metal vanadium with d2 electronic configuration which is able to emit phosphorescence in solution in...

scholarly journals Ultrafast and long-time excited state kinetics of an NIR-emissive vanadium(III) complex I: Synthesis, spectroscopy and static quantum chemistry

2021 ◽  
Author(s):  
Matthias Dorn ◽  
Jens Kalmbach ◽  
Pit Boden ◽  
Ayla Kruse ◽  
Chahinez Dab ◽  
...  
Keyword(s):  
Excited State ◽  
Transition Metal ◽  
Quantum Chemistry ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Complex I ◽  
Ligand Field ◽  
Earth Abundant ◽  
Long Time ◽  
Kinetics Of

In spite of intense, recent research efforts, luminescent transition metal complexes with Earth-abundant metals are still very rare owing to the small ligand field splitting of 3d transition metal complexes...

Boosting the photocatalytic activity of graphite carbon nitride by designing novel MoS2–transition metal heterojunction cocatalysts

2019 ◽  
Vol 7 (42) ◽  
pp. 13211-13217 ◽  
Author(s):  
Kui Li ◽  
Ye-Zhan Lin ◽  
Yu Zhang ◽  
Mei-Ling Xu ◽  
Ling-Wang Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Transition Metal ◽  
Synergistic Effect ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
The Earth ◽  
Earth Abundant

MoS2–transition metal heterojunctions were adopted as cocatalysts on the earth-abundant g-C3N4 and displayed a synergistic effect on improving the photocatalytic performance.

scholarly journals Imaging ultrafast excited state pathways in transition metal complexes by X-ray transient absorption and scattering using X-ray free electron laser source

2016 ◽  
Vol 194 ◽  
pp. 639-658 ◽  
Author(s):  
Lin X. Chen ◽  
Megan L. Shelby ◽  
Patrick J. Lestrange ◽  
Nicholas E. Jackson ◽  
Kristoffer Haldrup ◽  
...  
Keyword(s):  
Excited State ◽  
Transition Metal ◽  
Free Electron ◽  
Free Electron Laser ◽  
Electronic Configuration ◽  
Laser Source ◽  
Relaxation Processes ◽  
Valence Orbital ◽  
X Ray ◽  
Orbital Energies

This report will describe our recent studies of transition metal complex structural dynamics on the fs and ps time scales using an X-ray free electron laser source, Linac Coherent Light Source (LCLS). Ultrafast XANES spectra at the Ni K-edge of nickel(ii) tetramesitylporphyrin (NiTMP) were measured for optically excited states at a timescale from 100 fs to 50 ps, providing insight into its sub-ps electronic and structural relaxation processes. Importantly, a transient reduced state Ni(i) (π, 3dx2−y2) electronic state is captured through the interpretation of a short-lived excited state absorption on the low-energy shoulder of the edge, which is aided by the computation of X-ray transitions for postulated excited electronic states. The observed and computed inner shell to valence orbital transition energies demonstrate and quantify the influence of the electronic configuration on specific metal orbital energies. A strong influence of the valence orbital occupation on the inner shell orbital energies indicates that one should not use the transition energy from 1s to other orbitals to draw conclusions about the d-orbital energies. For photocatalysis, a transient electronic configuration could influence d-orbital energies up to a few eV and any attempt to steer the reaction pathway should account for this to ensure that external energies can be used optimally in driving desirable processes. NiTMP structural evolution and the influence of the porphyrin macrocycle conformation on relaxation kinetics can be likewise inferred from this study.

Titanium catalysis for the synthesis of fine chemicals – development and trends

2020 ◽  
Vol 49 (19) ◽  
pp. 6947-6994 ◽  
Author(s):  
Manfred Manßen ◽  
Laurel L. Schafer
Keyword(s):  
Transition Metal ◽  
Industrial Processes ◽  
Fine Chemicals ◽  
The Earth ◽  
The Future ◽  
Earth Abundant

Atlas as a Titan(ium) is holding the earth-abundant chemistry world. Titanium is the second most abundant transition metal, is a key player in important industrial processes (e.g. polyethylene) and shows much promise for diverse applications in the future.

Excited state kinetics of neutral transition metal atoms by stimulated emission pumping: V*(3d44s,a4D)+hydrocarbons

1997 ◽  
Vol 106 (13) ◽  
pp. 5509-5525 ◽  
Author(s):  
Ye Wen ◽  
Arun Yethiraj ◽  
James C. Weisshaar
Keyword(s):  
Excited State ◽  
Transition Metal ◽  
Stimulated Emission ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Kinetics Of

Electronic structure in the transition metal block and its implications for light harvesting

Science ◽  
2019 ◽  
Vol 363 (6426) ◽  
pp. 484-488 ◽  
Author(s):  
James K. McCusker
Keyword(s):  
Electron Transfer ◽  
Electronic Structure ◽  
Excited State ◽  
Transition Metal ◽  
Solar Energy ◽  
Photoinduced Electron Transfer ◽  
Chemical Processes ◽  
Transition Series ◽  
Earth Abundant ◽  
Metal Block

Transition metal–based chromophores play a central role in a variety of light-enabled chemical processes ranging from artificial solar energy conversion to photoredox catalysis. The most commonly used compounds include elements from the second and third transition series (e.g., ruthenium and iridium), but their Earth-abundant first-row analogs fail to engage in photoinduced electron transfer chemistry despite having virtually identical absorptive properties. This disparate behavior stems from fundamental differences in the nature of 3d versus 4d and 5d orbitals, resulting in an inversion in the compounds’ excited-state electronic structure and undermining the ability of compounds with first-row elements to engage in photoinduced electron transfer. This Review will survey the key experimental observations establishing this difference in behavior, discuss the underlying reasons for this phenomenon, and briefly summarize efforts that are currently under way to alter this paradigm and open the door to new opportunities for using Earth-abundant materials for photoinduced electron transfer chemistries.

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