scholarly journals Anion binding of a neutral bis(cyclopeptide) in water–methanol mixtures containing up to 95% water

2014 ◽  
Vol 12 (44) ◽  
pp. 8851-8860 ◽  
Author(s):  
Fabian Sommer ◽  
Stefan Kubik
Keyword(s):  
Water Content ◽  
Anion Binding ◽  
Anion Receptor ◽  
Weakly Coordinating

Selectivity of a synthetic anion receptor reverses from strongly coordinating sulfate to weakly coordinating iodide anions upon increasing the water content of the solution.

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.

Anion receptor molecules. Synthesis and some anion binding properties of macrocyclic guanidinium salts

1978 ◽  
pp. 934 ◽  
Author(s):  
Bernard Dietrich ◽  
Thomas M. Fyles ◽  
Jean-Marie Lehn ◽  
Lila G. Pease ◽  
Deborah L. Fyles
Keyword(s):  
Anion Binding ◽  
Anion Receptor ◽  
Binding Properties ◽  
Guanidinium Salts

Anion receptor molecules. Synthesis and anion-binding properties of polyammonium macrocycles

1981 ◽  
Vol 103 (5) ◽  
pp. 1282-1283 ◽  
Author(s):  
B. Dietrich ◽  
M. W. Hosseini ◽  
J. M. Lehn ◽  
R. B. Sessions
Keyword(s):  
Anion Binding ◽  
Anion Receptor ◽  
Binding Properties

Solution and gas phase evidence of anion binding through the secondary bonding interactions of a bidentate bis-antimony(iii) anion receptor

2018 ◽  
Vol 20 (1) ◽  
pp. 46-50 ◽  
Author(s):  
J. Qiu ◽  
B. Song ◽  
X. Li ◽  
A. F. Cozzolino
Keyword(s):  
Gas Phase ◽  
Anion Binding ◽  
Anion Receptor ◽  
Esi Ms ◽  
Nmr Titrations ◽  
Secondary Bonding

Solution and gas phase evidence of halide binding to a bis-antimony(iii) anion receptor is demonstrated through NMR titrations and ESI-MS.

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