Sodium–carboxylate contact ion pair formation induces stabilization of palmitic acid monolayers at high pH

2017 ◽  
Vol 19 (16) ◽  
pp. 10481-10490 ◽  
Author(s):  
Ellen M. Adams ◽  
Bethany A. Wellen ◽  
Raphael Thiraux ◽  
Sandeep K. Reddy ◽  
Andrew S. Vidalis ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Palmitic Acid ◽  
Ion Pair ◽  
Pair Formation ◽  
High Ph ◽  
Ion Pair Formation ◽  
Sodium Carboxylate ◽  
Contact Ion Pair ◽  
Theory And Experiments

Theory and experiments show that ion-pair formation drives adsorption of deprotonated fatty acids to the interface.

Direct Observation of Contact Ion-Pair Formation in Aqueous Solution

2009 ◽  
Vol 121 (33) ◽  
pp. 6252-6256 ◽  
Author(s):  
Mark R. Antonio ◽  
May Nyman ◽  
Travis M. Anderson
Keyword(s):  
Aqueous Solution ◽  
Direct Observation ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation ◽  
Contact Ion Pair

Contact Ion Pair Formation between Hard Acids and Soft Bases in Aqueous Solutions Observed with 2DIR Spectroscopy

2013 ◽  
Vol 117 (49) ◽  
pp. 15306-15312 ◽  
Author(s):  
Zheng Sun ◽  
Wenkai Zhang ◽  
Minbiao Ji ◽  
Robert Hartsock ◽  
Kelly J. Gaffney
Keyword(s):  
Aqueous Solutions ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation ◽  
Contact Ion Pair ◽  
2Dir Spectroscopy

Elektronentransfer und Kontaktionen-Bildung, 42 [1,2] Cyclovoltammetrische und ESR / ENDOR-Untersuchungen der Einelektronen-Reduktion von Diphenochinonen / Electron Transfer and Contact Ion Pair Formation, 42 [1,2] Cyclovoltammetric and ESR / ENDOR Investigations of the One-Electron Reduction of Diphenoquinones

1995 ◽  
Vol 50 (11) ◽  
pp. 1699-1716
Author(s):  
Andreas John ◽  
Hans Bock
Keyword(s):  
Radical Anion ◽  
Ion Pairs ◽  
Ion Pair ◽  
Pair Formation ◽  
Coupling Constants ◽  
Semiquinone Radical ◽  
Additional Information ◽  
Ion Pair Formation ◽  
Contact Ion Pair ◽  
The Difference

Semiquinone radical anions are prototype compounds for contact ion pair formation with metal counter cations. In order to investigate the still open question whether bulky alkyl groups can sterically interfere, diphenoquinone derivatives O=C(RC=CH)2C=C(HC=CR)2C=O with R = C(CH3)3, CH(CH3)2 and CH3 have been selected and the following ESR/ENDOR results are obtained for the alkaline metal cations: The tetrakis(tert-butyl)-substituted radical anion only adds Li⊕ and Na⊕, while K⊕ forms no ion pair. The 3,3ʹ,5,5ʹ-tetra(isopropyl)diphenoquinone radical anion is accessible to all cations Me⊕, although Rb⊕ and Cs⊕ seem to be present solvent-separated in solution. The tetramethyl-substituted radical anion unfortunately polymerizes rapidly. Additional information concerns the ESR/ENDOR proof for ion triple radical cation formation [Li⊕ M•⊖Li⊕]•⊕, or the difference in the coupling constants upon Me⊕ docking at one δ⊖O=C group, suggesting that about 87% of the spin density is located in the cation-free molecular half of the diphenoquinone radical anion. Based on the wealth of ESR/ENDOR information, crystallization of the contact ion pairs and their structural characterization should be attempted.

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