Study by electron paramagnetic resonance of charge transfer complexes formed by adsorption of TCNE on type X- and Y-zeolites

1978 ◽  
Vol 74 (0) ◽  
pp. 530 ◽  
Author(s):  
Christian Druon ◽  
Daniel Pasquet ◽  
Pierre Tabourier ◽  
Jean-Marie Wacrenier
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Paramagnetic Resonance ◽  
Y Zeolites ◽  
Electron Paramagnetic

Electron Paramagnetic Resonance Studies of Donor-Acceptor Salts in Polymer Media

1989 ◽  
Vol 173 ◽  
Author(s):  
Yang-Cheng Fann ◽  
Susan Ann Jansen
Keyword(s):  
Electrical Conductivity ◽  
Electron Paramagnetic Resonance ◽  
Magnetic Properties ◽  
Charge Transfer ◽  
Molecular Electronics ◽  
Charge Transfer Complexes ◽  
Paramagnetic Resonance ◽  
Donor Acceptor ◽  
Electron Paramagnetic ◽  
Polymeric Medium

ABSTRACTCharge transfer complexes, their inherent electrical conductivity, magnetic properties and donor-acceptor redox relationships have been a focus of much research in the last several years. One direction has been in the design of memory devices and applications in molecular electronics.1,2 Our work has focused on analysis of such processes in a polymeric medium. Polycarbonate films of 7,7’,8,8’-Tetracyanoquinodimethane (TCNQ) and o-tolidine (o-T) complexes were studied by EPR spectroscopy from 100-300K. EPR spectra and magnetic susceptibility of the dispersed charge-transfer complexes are presented and compared with the pristine materials. These studies were carried out as a function of donor/acceptor stoichiometry and concentration within the polymer matrix. Saturation studies show significant differences as the composition varies. In addition the g-tensor and linewidth are strongly dependent on temperature and composition.

On The EPR Parameters of Divalent Cobalt in ZnX (X = S, Se, Te) And CdTe

2004 ◽  
Vol 59 (12) ◽  
pp. 938-942 ◽  
Author(s):  
Shao-Yi Wu ◽  
Hui-Ning Dong
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Charge Transfer ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Paramagnetic Resonance ◽  
A Value ◽  
Epr Parameters ◽  
Divalent Cobalt ◽  
Structure Constants ◽  
Electron Paramagnetic

The electron paramagnetic resonance (EPR) parameters g and the hyperfine structure constants A of Co2+ in ZnX (X = S, Se, Te) and CdTe are studied, using the perturbation formulas of the EPR parameters for a 3d7 ion in tetrahedra based on two mechanism models. In these formulas, both the contributions from the conventional crystal-field (CF) mechanism and those from the charge-transfer (CT) mechanism are taken into account. According to the investigations, the sign of the g-shift ΔgCT from the CT mechanism is the same as ΔgCF from the CF mechanism, whereas the contributions to the A value from the CF and CT mechanisms have opposite signs. Particularly, the contributions to the EPR parameters from the CT mechanism increase rapidly with increase of the spin-orbit coupling coefficient of the ligand and the covalency effect of the systems, i. e. S2− < Se2− < Te2−.

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