Redox-active crown ethers. Electrochemical and electron paramagnetic resonance studies on alkali metal complexes of quinone crown ethers

1992 ◽  
Vol 114 (23) ◽  
pp. 8983-8991 ◽  
Author(s):  
Milagros Delgado ◽  
Robert E. Wolf ◽  
JudithAnn R. Hartman ◽  
Gillian McCafferty ◽  
Rahmi Yagbasan ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Alkali Metal ◽  
Metal Complexes ◽  
Crown Ethers ◽  
Paramagnetic Resonance ◽  
Redox Active ◽  
Electron Paramagnetic ◽  
Alkali Metal Complexes

scholarly journals Synthesis and electron paramagnetic resonance studies of chiral spin-labeled crown ethers

1984 ◽  
Vol 62 (3) ◽  
pp. 489-497 ◽  
Author(s):  
H. Dugas ◽  
P. Keroack ◽  
M. Ptak
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Crown Ether ◽  
Crown Ethers ◽  
Spin Interaction ◽  
Ion Binding ◽  
Paramagnetic Resonance ◽  
Dynamical Fluctuation ◽  
Electron Paramagnetic

The synthesis of syn and anti chiral dinitroxide [18]-crown-6 ethers and of a tetranitroxide crown ether is described. The existence of a spin–spin interaction for the syn isomer makes this spin-labeled crown ether probe particularly useful to follow by epr the effects of K+ ion binding, pH, solvent, and temperature. These observations are discussed in terms of a global dynamical fluctuation of the substituted crown ether.

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