Switching from Separated to Contact Ion-Pair Binding Modes with Diastereomeric Calix[4]pyrrole Bis-phosphonate Receptors

2012 ◽  
Vol 134 (31) ◽  
pp. 13121-13132 ◽  
Author(s):  
Moira Ciardi ◽  
Francesca Tancini ◽  
Guzmán Gil-Ramírez ◽  
Eduardo C. Escudero Adán ◽  
Chiara Massera ◽  
...  
Keyword(s):  
Ion Pair ◽  
Binding Modes ◽  
Contact Ion Pair

Steady-State Spectroscopy to Single Out the Contact Ion Pair in Excited-State Proton Transfer

2021 ◽  
Vol 12 (6) ◽  
pp. 1683-1689
Author(s):  
Alexander Grandjean ◽  
J. Luis Pérez Lustres ◽  
Stephan Muth ◽  
Daniel Maus ◽  
Gregor Jung
Keyword(s):  
Excited State ◽  
Steady State ◽  
Proton Transfer ◽  
Ion Pair ◽  
Contact Ion Pair ◽  
Excited State Proton Transfer

scholarly journals Highly Efficient, Tripodal Ion-Pair Receptors for Switching Selectivity between Acetates and Sulfates Using Solid–Liquid and Liquid–Liquid Extractions

2020 ◽  
Vol 21 (24) ◽  
pp. 9465
Author(s):  
Marta Zaleskaya ◽  
Łukasz Dobrzycki ◽  
Jan Romański
Keyword(s):  
Binding Sites ◽  
Liquid Extraction ◽  
Ion Pair ◽  
Anion Binding ◽  
Binding Modes ◽  
Anion Receptor ◽  
X Ray ◽  
Liquid Liquid Extraction ◽  
Solid Liquid Extraction ◽  
Solid Liquid

A tripodal, squaramide-based ion-pair receptor 1 was synthesized in a modular fashion, and 1H NMR and UV-vis studies revealed its ability to interact more efficiently with anions with the assistance of cations. The reference tripodal anion receptor 2, lacking a crown ether unit, was found to lose the enhancement in anion binding induced by presence of cations. Besides the ability to bind anions in enhanced manner by the “single armed” ion-pair receptor 3, the lack of multiple and prearranged binding sites resulted in its much lower affinity towards anions than in the case of tripodal receptors. Unlike with receptors 2 or 3, the high affinity of 1 towards salts opens up the possibility of extracting extremely hydrophilic sulfate anions from aqueous to organic phase. The disparity in receptor 1 binding modes towards monovalent anions and divalent sulfates assures its selectivity towards sulfates over other lipophilic salts upon liquid–liquid extraction (LLE) and enables the Hofmeister bias to be overcome. By changing the extraction conditions from LLE to SLE (solid–liquid extraction), a switch of selectivity from sulfates to acetates was achieved. X-ray measurements support the ability of anion binding by cooperation of the arms of receptor 1 together with simultaneous binding of cations.

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.

Formation of Zirconocene Fluoro Complexes: No Deactivation in the Polymerization of Olefins by the Contact-Ion-Pair Catalysts [Cp′2ZrR]+[RB(C6F5)3]−

2006 ◽  
Vol 45 (25) ◽  
pp. 4195-4198 ◽  
Author(s):  
Perdita Arndt ◽  
Ulrike Jäger-Fiedler ◽  
Marcus Klahn ◽  
Wolfgang Baumann ◽  
Anke Spannenberg ◽  
...  
Keyword(s):  
Ion Pair ◽  
Contact Ion Pair
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