9-Anthryl and 1-pyrenyl groups as reporters of local environments and diffusion of two N,N-dialkylanilines in polyethylene films. Excited state lifetimes determine spatial information

Polymer ◽  
2004 ◽  
Vol 45 (16) ◽  
pp. 5713-5718 ◽  
Author(s):  
Oliver Schurr ◽  
Richard G. Weiss
Keyword(s):  
Excited State ◽  
Spatial Information ◽  
Polyethylene Films ◽  
Local Environments ◽  
Excited State Lifetimes ◽  
And Diffusion

Ultrafast Spectroscopy of Arylchlorodiazirines: Hammett Correlations of Excited State Lifetimes

2009 ◽  
Vol 131 (46) ◽  
pp. 16652-16653 ◽  
Author(s):  
Yunlong Zhang ◽  
Lei Wang ◽  
Robert A. Moss ◽  
Matthew S. Platz
Keyword(s):  
Excited State ◽  
Ultrafast Spectroscopy ◽  
Excited State Lifetimes

Steric Effects in the Electronic Spectra of the 3,5-Diarylaminobenzene Derivatives

1986 ◽  
Vol 41 (11) ◽  
pp. 1311-1314 ◽  
Author(s):  
A. Balter ◽  
W. Nowak ◽  
P. Milart ◽  
J. Sepioł
Keyword(s):  
Excited State ◽  
Electronic Spectra ◽  
Fluorescence Properties ◽  
Steric Effects ◽  
Quantum Yields ◽  
Spectroscopic Behaviour ◽  
Fluorescence Quantum Yields ◽  
Excited State Lifetimes ◽  
Methyl Phenyl

Absorption and fluorescence properties, excited state lifetimes and fluorescence quantum yields were determined for a series of 3,5-diarylaminobenzene derivatives in solvents of different polarities. The role of the nitrile, methyl, phenyl and naphthyl substituents is discussed. Especially the steric effects on the spectroscopic behaviour of the investigated molecules are studied.

scholarly journals Mono- Versus Bicyclic Carbene Metal Amide Photoemitters: Which Design Leads to Best Performance?

2020 ◽  
Author(s):  
Florian Chotard ◽  
Vasily Sivchik ◽  
Mikko Linnolahti ◽  
Manfred Bochmann ◽  
Alexander Romanov
Keyword(s):  
Excited State ◽  
State Energy ◽  
Conformational Flexibility ◽  
Quantum Yields ◽  
Carbene Ligands ◽  
Lumo Energy ◽  
Excited State Energy ◽  
Excited State Lifetimes

New luminescent “carbene-metal-amide” (CMA) Cu, Ag and Au complexes based on monocyclic (C6) or bicyclic six-ring (BIC6) cyclic (alkyl)(amino)carbene ligands illustrates the effects of LUMO energy stabilization, conformational flexibility and excited state energy on the photoemission properties, leading to near-quantitative quantum yields, short excited state lifetimes Cu > Au > Ag down to 0.5 µs and high radiative rates of 10<sup>6</sup> s<sup>–1</sup>.

scholarly journals Inference of Morphogen Gradient Precision from Molecular Noise Data

2021 ◽  
Author(s):  
Roman Vetter ◽  
Dagmar Iber
Keyword(s):  
Precise Measurement ◽  
Spatial Information ◽  
Domain Size ◽  
Noise Levels ◽  
New Formalism ◽  
Morphogen Gradients ◽  
Molecular Noise ◽  
Noise Data ◽  
Neural Tube Development ◽  
And Diffusion

During development, morphogen gradients provide spatial information for tissue patterning. Gradients and readout mechanisms are inevitably variable, yet the resulting patterns are strikingly precise. Measurement limitations currently preclude precise detection of morphogen gradients over long distances. Here, we develop a new formalism to estimate gradient precision along the entire patterning axis from measurements close to the source. Using numerical simulations, we infer gradient variability from measured molecular noise levels in morphogen production, decay, and diffusion. The predicted precision is much higher than previously measured—precise enough to allow even single gradients to define the central progenitor boundaries during neural tube development. Finally, we show that the patterning mechanism is optimized for precise progenitor cell numbers, rather than precise boundary positions, as the progenitor domain size is particularly robust to gradient alterations. We conclude that single gradients can yield the observed developmental precision, which provides new prospects for tissue engineering.

Direct measurements of excited-state lifetimes in Mg, Ca, and Sr†

1977 ◽  
Vol 67 (4) ◽  
pp. 488 ◽  
Author(s):  
M. D. Havey ◽  
L. C. Balling ◽  
J. J. Wright
Keyword(s):  
Excited State ◽  
Direct Measurements ◽  
Excited State Lifetimes

Excited state lifetimes and appearance potentials of benzene dimer and trimer

1989 ◽  
Vol 91 (11) ◽  
pp. 6743-6751 ◽  
Author(s):  
Hisanori Shinohara ◽  
Nobuyuki Nishi
Keyword(s):  
Excited State ◽  
Benzene Dimer ◽  
Excited State Lifetimes

scholarly journals Correction to “A Synthetically Tunable System To Control MLCT Excited-State Lifetimes and Spin States in Iron(II) Polypyridines”

2018 ◽  
Vol 140 (3) ◽  
pp. 1181-1182
Author(s):  
Steven M. Fatur ◽  
Samuel G. Shepard ◽  
Robert F. Higgins ◽  
Matthew P. Shores ◽  
Niels H. Damrauer
Keyword(s):  
Excited State ◽  
Spin States ◽  
Tunable System ◽  
Excited State Lifetimes

Halogenation Affects Driving Forces, Reorganization Energies and “Rocking” Motions in Strained [Fe(tpy)2]2+ Complexes

2021 ◽  
Author(s):  
Hyuk-Yong Kwon ◽  
Daniel Ashley ◽  
Elena Jakubikova
Keyword(s):  
Excited State ◽  
Spin Crossover ◽  
Driving Forces ◽  
Multifunctional Materials ◽  
Iron Based ◽  
Excited State Lifetimes ◽  
Reorganization Energies ◽  
Polypyridine Complexes

Controlling the energetics of spin crossover (SCO) in Fe(II)-polypyridine complexes is critical for designing new multifunctional materials or tuning the excited-state lifetimes of iron-based photosensitizers. It is well established that...

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