SOLVENT EFFECT ON CARBONYL13C HYPERFINE SPLITTING OF FREE ANION RADICAL OF 9-FLUORENONE: A MEASURE FOR ANION SOLVATION POWER OF APROTIC SOLVENTS

1980 ◽  
Vol 9 (3) ◽  
pp. 301-304 ◽  
Author(s):  
Kazuo Nakamura
Keyword(s):  
Solvent Effect ◽  
Hyperfine Splitting ◽  
Anion Radical ◽  
Aprotic Solvents

Molecular Theory of Solvent Effect on Keto−Enol Tautomers of Formamide in Aprotic Solvents:  RISM-SCF Approach

1998 ◽  
Vol 102 (11) ◽  
pp. 2045-2050 ◽  
Author(s):  
Tateki Ishida ◽  
Fumio Hirata ◽  
Hirofumi Sato ◽  
Shigeki Kato
Keyword(s):  
Solvent Effect ◽  
Molecular Theory ◽  
Aprotic Solvents

Host–Guest interaction of pesticide bifenox with cyclodextrin molecules. An electrochemical study

2009 ◽  
Vol 74 (11-12) ◽  
pp. 1647-1664 ◽  
Author(s):  
Magdaléna Hromadová ◽  
Romana Sokolová ◽  
Lubomír Pospíšil ◽  
Štěpánka Lachmanová ◽  
Nicolangelo Fanelli ◽  
...  
Keyword(s):  
Complex Formation ◽  
Anion Radical ◽  
Formation Constants ◽  
Aprotic Solvents ◽  
Reduction Wave ◽  
Nitroaromatic Compound ◽  
Complex Formation Constants ◽  
Oh Groups ◽  
Stable Anion ◽  
Main Factor

The reduction of nitroaromatic compound bifenox (methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate) was studied in aprotic solvents in the absence or presence of cyclodextrin (CD) molecules of different cavity sizes. βCD and γCD form complexes with bifenox in DMSO with the complex formation constants (5 ± 2) × 102 M–1 [βCD–bifenox] and (3 ± 1) × 102 M–1 [γCD–bifenox], respectively. Bifenox yields a relatively stable anion radical in dimethyl sulfoxide, which is further reduced at more negative potentials by an overall addition of three electrons and four protons to the corresponding phenylhydroxylamine. In the presence of βCD the first reduction wave of bifenox becomes irreversible, it is shifted towards more positive potentials and the uptake of more than one electron is observed (up to four electrons during the exhaustive electrolysis). The first reduction wave of bifenox is not affected by the addition of glucose confirming that a simple availability of protons from the OH groups is not the main factor in further transformation of anion radical in the presence of βCD. The complex formation with βCD facilitates the protonation and additionally protects the molecule from disintegration into 2,4-dichlorophenol. A yield of 2,4-dichlorophenol decreases in the order βCD, γCD and αCD, respectively.

Studies on the iodide–triiodide equilibrium

1977 ◽  
Vol 55 (5) ◽  
pp. 792-797 ◽  
Author(s):  
Robert L. Benoit ◽  
Michael F. Wilson ◽  
Sing-Yeung Lam
Keyword(s):  
Free Energy ◽  
Solvent Effect ◽  
Gas Phase ◽  
Formation Enthalpy ◽  
Aprotic Solvents ◽  
Free Energies ◽  
Potentiometric Measurements ◽  
Cast Doubt ◽  
Transfer Parameters ◽  
The Enthalpy Of Formation

The solvent effect on the iodide–triiodide equilibrium has been investigated by means of calorimetric and potentiometric measurements. The aprotic solvents studied were nitromethane, nitrobenzene, sulfolane, acetonitrile, propylene carbonate, acetophenone, dimethylformamide, dimethylsulfoxide, and o-dichlorobenzene. The resulting enthalpy and free energy changes imply that the variations of the enthalpies and free energies of transfer of the iodide and triiodide ions probably are small and that there is an important non-coulombic contribution to these transfer parameters. Values were obtained for the enthalpy of formation of two solid triiodides, which together with values for other triiodides, cast doubt on reported calculated lattice enthalpies of triiodides and formation enthalpy of I3− ion in the gas phase. This latter formation enthalpy is found to be, from our solution data, more negative than −22 kcal mol−1.

An unusual hyperfine splitting in the anion radical of pyridinium bis(methoxycarbonyl)methylide

1979 ◽  
Vol 35 (1) ◽  
pp. 171-174 ◽  
Author(s):  
H Fujita ◽  
J Yamauchi ◽  
K Matsumoto ◽  
H Ohya-Nishiguchi ◽  
Y Deguchi
Keyword(s):  
Hyperfine Splitting ◽  
Anion Radical

Solvent Effect in the Electrochemical Reduction of p‐Quinones in Several Aprotic Solvents

1990 ◽  
Vol 137 (8) ◽  
pp. 2437-2443 ◽  
Author(s):  
Kazuo Sasaki ◽  
Tomoyuki Kashimura ◽  
Masahiro Ohura ◽  
Yasushi Ohsaki ◽  
Nobuaki Ohta
Keyword(s):  
Solvent Effect ◽  
Electrochemical Reduction ◽  
Aprotic Solvents

scholarly journals Kinetics and Mechanisms for Protonation of the Anthracene Anion Radical by beta-Dicarbonyl Compounds in Aprotic Solvents.

1991 ◽  
Vol 45 ◽  
pp. 292-301 ◽  
Author(s):  
Merete Folmer Nielsen ◽  
Hanne Eggert ◽  
Ole Hammerich ◽  
K. P. J. O'Reilly ◽  
Anne Ertan ◽  
...  
Keyword(s):  
Anion Radical ◽  
Aprotic Solvents ◽  
Dicarbonyl Compounds

scholarly journals Chloro complexes of cobalt(II) in aprotic solvents: stability and structural modifications due to solvent effect

2009 ◽  
Vol 62 (10) ◽  
pp. 1572-1583 ◽  
Author(s):  
Abdelghani Chiboub-Fellah ◽  
François Vierling ◽  
Jean Meullemeestre ◽  
Marie-José Schwing-Weill ◽  
Mustayeen Ahmed Khan
Keyword(s):  
Solvent Effect ◽  
Aprotic Solvents ◽  
Chloro Complexes ◽  
Structural Modifications

Solvent effect on the esr hyperfine splitting constants of some phenoxyl radicals

1968 ◽  
Vol 9 (46) ◽  
pp. 4773-4775 ◽  
Author(s):  
Y. O¯ishi ◽  
K. Mukai ◽  
H. Nishiguchi ◽  
Y. Deguchi ◽  
H. Takaki
Keyword(s):  
Solvent Effect ◽  
Hyperfine Splitting ◽  
Phenoxyl Radicals
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