scholarly journals Influence of local microenvironment on the double hydrogen transfer in porphycene

2020 ◽  
Vol 22 (30) ◽  
pp. 17117-17128
Author(s):  
Piotr Kasprzycki ◽  
Przemysław Kopycki ◽  
Arkadiusz Listkowski ◽  
Aleksander Gorski ◽  
Czesław Radzewicz ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Hydrogen Transfer ◽  
Time Resolved ◽  
Double Hydrogen

Time-resolved studies of the double hydrogen transfer in porphycene indicate strong coupling of the reaction to the dynamics of the local microenvironment.

The long and winding road to new porphycenes

2012 ◽  
Vol 16 (05n06) ◽  
pp. 589-602 ◽  
Author(s):  
Igor Czerski ◽  
Arkadiusz Listkowski ◽  
Jan Nawrocki ◽  
Natalia Urbańska ◽  
Hubert Piwoński ◽  
...  
Keyword(s):  
Fluorescence Polarization ◽  
Hydrogen Transfer ◽  
Single Molecules ◽  
Tert Butyl ◽  
Tautomeric Forms ◽  
By Products ◽  
Double Hydrogen

We describe attempts — not always successful — made over the years to improve the efficiency of porphycene synthesis and to produce novel compounds, custom-designed for specific purposes. New porphycenes are reported, some of them obtained rather unexpectedly as by-products of the planned reactions. Structure and energy computations of possible tautomeric forms in porphycenes substituted by one, two, three, and four tert-butyl groups lead to predictions regarding the kinetics and mechanisms of intramolecular double hydrogen transfer. The occurrence of tautomerization in single molecules of tert-butylsubstituted porphycenes is demonstrated by using fluorescence polarization techniques.

scholarly journals Vesicle adhesion in the electrostatic strong-coupling regime studied by time-resolved small-angle X-ray scattering

Soft Matter ◽  
2020 ◽  
Vol 16 (17) ◽  
pp. 4142-4154 ◽  
Author(s):  
Karlo Komorowski ◽  
Jannis Schaeper ◽  
Michael Sztucki ◽  
Lewis Sharpnack ◽  
Gerrit Brehm ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Small Angle ◽  
Lipid Vesicles ◽  
Strong Coupling Regime ◽  
Divalent Ions ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

We have used time-resolved small-angle X-ray scattering (SAXS) to study the adhesion of lipid vesicles in the electrostatic strong-coupling regime induced by divalent ions.

Time-resolved CIDNP study of hydrogen transfer in the photolysis of carbonyl-containing compounds

1989 ◽  
Vol 139 (2-3) ◽  
pp. 301-306 ◽  
Author(s):  
Yu.P. Tsentalovich ◽  
A.A. Obynochny ◽  
R.Z. Sagdeev
Keyword(s):  
Hydrogen Transfer ◽  
Time Resolved

Calculations of Mode-Specific Tunneling of Double-Hydrogen Transfer in Porphycene Agree with and Illuminate Experiment

2014 ◽  
Vol 5 (15) ◽  
pp. 2723-2727 ◽  
Author(s):  
Zahra Homayoon ◽  
Joel M. Bowman ◽  
Francesco A. Evangelista
Keyword(s):  
Hydrogen Transfer ◽  
Double Hydrogen

scholarly journals Photoinduced Intramolecular Hydrogen Transfer Reaction of Ortho Nitrobenzyl Compounds

1999 ◽  
Vol 19 (1-4) ◽  
pp. 357-362 ◽  
Author(s):  
Hiroaki Takahashi ◽  
Yoshiki Watanabe ◽  
Makoto Sakai ◽  
Masanori Tachikawa
Keyword(s):  
Nitro Group ◽  
Absorption Spectra ◽  
Hydrogen Transfer ◽  
Transfer Reaction ◽  
Resonance Raman ◽  
Polar Solvents ◽  
Time Resolved ◽  
Hydrogen Transfer Reaction ◽  
Intramolecular Hydrogen

Time-resolved resonance Raman and absorption spectra have revealed that the photoinduced intramolecular hydrogen transfer reaction of ortho nitrobenzyl compounds is initiated by the abstraction of methylene hydrogen by the ortho nitro group to generate the ortho aci-nitro acid isomer. In polar solvents the ortho aci-nitro acid is dissociated into the aci-nitro anion and a proton, and the proton is captured by other hydrogen accepting sites, such as 2-pyridyl, 4-pyridyl and 4-nitro groups to generate the ortho N—H quinoid, para N—H quinoid and para aci-nitro acid isomers, respectively. For 2-nitroethylbenzene and 2- and 4-(2′-nitrobenzyl)pyridines the structure of the aci-nitro anion is very similar to that of their respective ortho aci-nitro acid, while for 2,4-dinitroethylbenzene the structure of the aci-nitro anion quite resembles that of the para aci-nitro acid.

Intramolecular hydrogen transfer in the o‐tolyl radical studied by time resolved absorption measurements

1986 ◽  
Vol 84 (3) ◽  
pp. 1943-1944 ◽  
Author(s):  
Teijiro Ichimura ◽  
Yuji Mori ◽  
Minoru Sumitani ◽  
Keitaro Yoshihara
Keyword(s):  
Hydrogen Transfer ◽  
Time Resolved ◽  
Intramolecular Hydrogen ◽  
Absorption Measurements
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