Dicopper(II) Complexes of Spiro Macrobicycles With Aza and Thia Aza Donor Sets

1990 ◽  
Vol 43 (12) ◽  
pp. 2035 ◽  
Author(s):  
PV Bernhardt ◽  
P Comba ◽  
LR Gahan ◽  
GA Lawrance
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Physical Properties ◽  
Structural Parameters ◽  
Paramagnetic Resonance ◽  
Binucleating Ligands ◽  
Electron Paramagnetic

Reaction of the dicopper (II) complex of the binucleating ligand 5,5- bis (4-amino-2-azabutyl)-3,7-diazanonane-1,9-diamine with nitroethane and formaldehyde in water gives the respective macrobicyclic and macromonocyclic binucleating ligands 7,21-dimethyl-7,21-dinitro-2,5,9,12,16,19,23,26-octaazaspiro[13.13] heptacosane and 6,6-bis(4- amino-2-azabutyl)-13-methyl-13-nitro-1,4,8,11-tetraazacyclotetradecane , both as their dicopper (II) complexes. Similarly, condensation of the dicopper (II) complex of 5,5-bis(4-amino- 2-thiabutyl)-3,7-dithianonane-1,9-diamine with nitroethane and formaldehyde results in the binucleating macrobicycle 7,21-dimethyl- 7,21-dinitro-2,12,16,26-tetrathia-5,9,19,23-tetraazaspiro[13.13]-heptacosane. Physical properties of all complexes are reported and comparisons with mononuclear relatives are made. Structural parameters derived from electron paramagnetic resonance spectra are discussed.

scholarly journals Superconductivity, Electron Paramagnetic Resonance, and Raman Scattering Studies of Heterofullerides with Cs and Mg

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
V. A. Kulbachinskii ◽  
B. M. Bulychev ◽  
V. G. Kytin ◽  
A. V. Krechetov ◽  
E. A. Konstantinova ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Raman Scattering ◽  
Physical Properties ◽  
Metal Halides ◽  
Exchange Reactions ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

In the present study, the results of investigation of physical properties of heterofulleridesA3−xMxC60(A=K, Rb, Cs, M=Be, Mg, Ca, Al, Fe, Tl,x=1,2); as well asRbCsTlC60,KCsTlC60, andKMg2C60are described. All of the fullerides were synthesized by the exchange reactions of alkaline fullerides with anhydrous metal halides. Superconductivity was found inRbCsTlC60andKCsTlC60.

Theoretical Studies of the EPR Parameters of Nd3+ in LiYF4

2004 ◽  
Vol 59 (4-5) ◽  
pp. 235-238 ◽  
Author(s):  
Shao-Yi Wu ◽  
Hui-Ning Dong
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Crystal Field ◽  
Structural Parameters ◽  
Tetragonal Symmetry ◽  
Theoretical Studies ◽  
Superposition Model ◽  
Paramagnetic Resonance ◽  
Epr Parameters ◽  
Crystal Field Parameters ◽  
Electron Paramagnetic

The perturbation formulas of the electron paramagnetic resonance (EPR) parameters g∥, g⊥, A∥ and A⊥ for a 4f3(Nd3+) ion in tetragonal symmetry are established in this work. In these formulas, the contributions to the EPR parameters arising from the second-order perturbation terms and the admixtures of different states are included. Then the above formulas are applied to a tetragonal Nd3+ center in LiYF4, where the related crystal-field parameters are calculated from the superposition model and the local structural parameters of the Y3+ site occupied by the impurity Nd3+. The EPR parameters and the optical spectra within the 4I9/2 and 4I11/2 states obtained in this work agree reasonably with the observed values.

Influence of C2-Methylation of Imidazolium Based Ionic Liquids on Photoinduced Spin Dynamics of the Dissolved ZnTPP Studied by Time-Resolved EPR

2017 ◽  
Vol 231 (2) ◽  
Author(s):  
Mikhail Yu. Ivanov ◽  
Sergey A. Prikhod’ko ◽  
Nicolay Yu. Adonin ◽  
Elena G. Bagryanskaya ◽  
Matvey V. Fedin
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Ionic Liquids ◽  
Physical Properties ◽  
Spin Dynamics ◽  
Probe Molecule ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Electron Paramagnetic

AbstractUnusual physical properties of ionic liquids (ILs) can be implemented in many different applications and are very sensitive to the structure of IL. In this work we investigate the spin dynamics of probe molecule Zn tetraphenylporphyrin (ZnTPP) dissolved in a series of ILs using time-resolved electron paramagnetic resonance (TR EPR). We compare the TR EPR characteristics in C2-methylated imidazolium-based ILs [bmmim]BF

Theoretical Investigations Of The Epr G Factors For Er3+ In Pr2cuo4 Superconductor

2003 ◽  
Vol 58 (7-8) ◽  
pp. 439-442
Author(s):  
Shao-Yi Wu ◽  
Hui-Ning Dong ◽  
Peng Li
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Structural Parameters ◽  
Tetragonal Symmetry ◽  
Model Parameters ◽  
Superposition Model ◽  
Paramagnetic Resonance ◽  
Theoretical Investigations ◽  
Crystal Field Parameters ◽  
Electron Paramagnetic ◽  
G Factors

The electron paramagnetic resonance g factors g|| and g⊥ for Er3+ in the superconductor Pr2CuO4 are investigated by using the perturbation formulas of g factors for a 4f11 ion in tetragonal symmetry. In these formulas, the contributions to the g factors due to the second-order perturbation terms and the admixture of different states are considered. The crystal field parameters used in the calculations are obtained from the superposition model and the local structural parameters of the impurity Er3+ located on the host Pr3+ site. The superposition model parameters adopted in this paper are comparable with those for similar tetragonal Er3+ centers in some zircon compounds in previous work. The above investigations may be helpful to understand the electronic and magnetic properties and hence the superconductivity of the Er3+ doped Pr2CuO4.

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