scholarly journals The Effects of Ion-pair Formation on the ESR Spectra of the Anion Radicals of 4-NitropyridineN-Oxide and 4-Nitropyridine

1973 ◽  
Vol 46 (3) ◽  
pp. 737-741 ◽  
Author(s):  
Yoshiko Kawamura (née \={O}ishi) ◽  
Koichi Nishikida ◽  
Tanekazu Kubota
Keyword(s):  
Esr Spectra ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation ◽  
Anion Radicals

Elektronentransfer und Ionenpaar-Bildung, 48 [1] Titrationen von Tetraphenyl-p-benzochinon mit Natrium- und Kaliummetall in aprotischen Lösungen / Electron Transfer and Ion Pair Formation, 48 [ 1 ] Titrations of Tetraphenyl-p-benzoquinone with Sodium and Potassium Metals in Aprotic Solutions

1996 ◽  
Vol 51 (9) ◽  
pp. 1222-1228 ◽  
Author(s):  
Hans Bock ◽  
Markus Kleine
Keyword(s):  
Electron Transfer ◽  
Radical Anion ◽  
Esr Spectra ◽  
Electron Transfer Reaction ◽  
Ion Pair ◽  
Pair Formation ◽  
Reaction Products ◽  
Ion Pair Formation ◽  
Electron Reduction ◽  
Sodium And Potassium

UV/VIS and ESR spectra of electron transfer reaction products in aprotic (cH⊕ < 0,1 ppm) solution can be measured in an especially designed and sealed glass apparatus and provide information on unknown facets of the microscopic pathway through the network of interdependent equilibria. For tetraphenyl-p-benzoquinone in tetrahydrofuran, single-electron reduction by a sodium metal mirror produces a red solution and, unexpectedly, after addition of 2.2.2. cryptand, contact with a potassium metal mirror generates a green (!) one. For both, ESR/ENDOR spectra prove the presence of tetraphenyl-p-benzoquinone radical anion. UV/VIS measurements provide the clue: In the equilibrium revealed by repetetive spectra recording, M·⊖solv + Me⊕solv ⇄ [M·⊖···Me⊖]solv, the radical anion is green (vm = 16900 cm-1) and the contact ion pair red (vm=18900 cm-1 ). On ion pair formation, therefore, the excitation energy of the radical anion increases by 0.25 eV.

Extraction of organic acids by ion-pair formation with tri-n-octylamine

1985 ◽  
Vol 178 ◽  
pp. 189-195 ◽  
Author(s):  
M. Puttemans ◽  
L. Dryon ◽  
D.L. Massart
Keyword(s):  
Organic Acids ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation

Charge-transfer stabilization of molecular bicimers: ion pair formation in diarylmethanes

1988 ◽  
Vol 92 (7) ◽  
pp. 1703-1705 ◽  
Author(s):  
R. J. Locke ◽  
Steve H. Modiano ◽  
E. C. Lim
Keyword(s):  
Charge Transfer ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation
Sign in / Sign up

Export Citation Format

Share Document