Radical cation of HP(O)(OMe)2: electron paramagnetic resonance evidence for competition between bonding to solvent, a 1,2-hydrogen shift, and a 1,4-hydrogen shift

1990 ◽  
Vol 86 (12) ◽  
pp. 2173 ◽  
Author(s):  
Robert Janes ◽  
Martyn C. R. Symons
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Radical Cation ◽  
Paramagnetic Resonance ◽  
Hydrogen Shift ◽  
Electron Paramagnetic

The electron paramagnetic resonance spectrum of S3N2+

1984 ◽  
Vol 62 (6) ◽  
pp. 1124-1126 ◽  
Author(s):  
Shirley A. Fairhurst ◽  
Keith F. Preston ◽  
Leslie H. Sutcliffe
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectrum ◽  
Radical Cation ◽  
Ground State ◽  
Resonance Spectrum ◽  
Nitrogen Compounds ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The epr spectrum of a persistent sulfur nitride radical cation, common to the oxidation of many sulphur–nitrogen compounds, has been obtained from materials highly enriched in both 15N and 33S. Analyses of solution and frozen spectra show that the carrier is planar S3N2+ and that its ground state is 2A2 in C2v. symmetry.

scholarly journals Electrochemical Studies on Vanadyl Complex with meso-5,10,15,20-tetrakis(2,5-Dimethoxyphenyl) porphyrin using Electron Paramagnetic Resonance and Cyclic Voltammetry

2020 ◽  
Vol 33 (1) ◽  
pp. 26-30
Author(s):  
A. MURUGAN ◽  
V. THANDIAYYAKONE ◽  
S. KUMARASAMY ◽  
C.R. RAVIKUMAR ◽  
S. MUTHAIAH ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Cyclic Voltammetry ◽  
Radical Cation ◽  
Cation Radical ◽  
Zero Field ◽  
Cyclic Voltammogram ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Broad Absorption Band ◽  
Electron Paramagnetic

The oxidation products of transition metal complexes with porphyrin are being examined currently by many research groups. meso- 5,10,15,20-tetrakis(2,5-Dimethoxyphenyl)porphyrin [T(2,5-(OCH3)2)PP] and its coordination compound with oxovanadium(IV) resulting in VO[T(2,5-(OCH3)2)PP] were prepared by the standard procedures. The resulting complex was characterized with or without the addition of antimony pentachloride by infrared (IR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy and cyclic voltammetry (CV). The UV-visible absorption spectrum of porphyrin ligand-based oxidation of vanadyl porphyrin VO[T(2,5-(OCH3)2)PP] in the presence of 0.5 mM SbCl5 has shown bands at 425, 540 and 650 nm. The final electro-oxidation product has a broad absorption band centered at 650 nm. It is characteristic of a porphyrin mono- cation which is seen due to oxidation at 0.0995V of ΔE value in the cyclic voltammogram of VO[T(2,5-(OCH3)2)PP]. These spectral features observed during the oxidation are in good agreement with the stepwise formation of mono-cation radical and di-cation. The EPR spectrum of VO[T(2,5-(OCH3)2)PP] suggests that it could be oxidized to the radical cation by oxidation with SbCl5 in dichloromethane. A radical cation is observed at low temperature and this spectrum corresponds to monomeric π-cation radical. A spectrum of fifteen lines is observed on the further addition of SbCl5 in dichloromethane. Thus, monomeric π-cation radical is recognized as [VO(TPP)]+. It is confirmed by the appearance of a new band at 1275 cm-1 in the IR spectrum. Zero field splitting (ZFS) was calculated from the triplet state on the EPR spectrum. It is suggested that ZFS interaction occurs from the dipolar coupling between the two electrons. Keywords: meso-Vanadyl porphyri

Sign in / Sign up

Export Citation Format

Share Document