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

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.

Reductive intramolecular hydrogen transfer in a d8 metal hydride promoted by carbon monoxide addition. An experimental study and its theoretical implications

1984 ◽  
Vol 23 (7) ◽  
pp. 922-929 ◽  
Author(s):  
Franco Cecconi ◽  
Carlo A. Ghilardi ◽  
Paolo Innocenti ◽  
Carlo Mealli ◽  
Stefano Midollini ◽  
...  
Keyword(s):  
Experimental Study ◽  
Carbon Monoxide ◽  
Metal Hydride ◽  
Hydrogen Transfer ◽  
Intramolecular Hydrogen

Theoretical study on intramolecular hydrogen transfer of 1-methylbutyl peroxide radical

2013 ◽  
Vol 53 (6) ◽  
pp. 431-437 ◽  
Author(s):  
Min Li ◽  
Li-Feng Xie ◽  
Xue-Hai Ju ◽  
Feng-Qi Zhao
Keyword(s):  
Hydrogen Transfer ◽  
Theoretical Study ◽  
Peroxide Radical ◽  
Intramolecular Hydrogen

scholarly journals Ultrafast dynamics of a bi-stable azopyridine Ni-porphyrin spin switch after photoexcitation in the porphyrin B-bands

2019 ◽  
Vol 205 ◽  
pp. 05019
Author(s):  
Sebastian Megow ◽  
Julia Bahrenburg ◽  
Mark Dittner ◽  
Birthe Kohly ◽  
Joachim Gripp ◽  
...  
Keyword(s):  
High Spin ◽  
Room Temperature ◽  
Ultrafast Dynamics ◽  
Time Resolved ◽  
Spin Switch ◽  
Absorption Measurements

Femtosecond time-resolved absorption measurements of a magnetically bi-stable azopyridine Ni-porphyrin in solution at room temperature show that the photo-induced dynamics are dominated by transient low-spin ⇄ high-spin interconversion involving Ni (d2) and (d, d) states.

Energy and Charge Transfer in Electroluminescent Polymer/Porphyrin Blends

1999 ◽  
Vol 560 ◽  
Author(s):  
V. Cleave ◽  
G. Yahioglu ◽  
P. Le Barny ◽  
R.H. Friend ◽  
N. Tessler ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Charge Separation ◽  
Emission Spectra ◽  
Time Resolved ◽  
Show Evidence ◽  
Homo And Lumo ◽  
Lumo Level ◽  
Photoluminescence Efficiency ◽  
Absorption Measurements ◽  
Triplet Excitons

ABSTRACTWe present a study of the effects of blending electroluminescent polymers with platinum (II) octaethylporphyrin (PtOEP). We find that in the case of polymers which are measured to have HOMO and LUMO levels respectively below and above those of the PtOEP, and which have emission spectra overlapping the PtOEP absorption spectra, energy transfer occurs as expected. We find further evidence, in the form of steady state and time-resolved electroluminescence and photoluminescence measurements, which indicates additional transfer of triplet excitons between polymer and porphyrin. Where the polymers have emission spectra overlapping the absorption spectra of PtOEP, but which are measured to have a HOMO or LUMO level between those of the porphyrin, quenching of the photoluminescence efficiency occurs. We propose this is due to charge separation between the porphyrin and the polymer, and show evidence for this in the form of photoinduced absorption measurements.

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