scholarly journals Characterization of Anthraquinone-DerivedRedox Switchable Ionophores and Their Complexes with Li+, Na+, K+, Ca+, and Mg+Metal Ions

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Vaishali Vyas ◽  
Pankaj Raizada ◽  
Uma Sharma
Keyword(s):  
Metal Ions ◽  
Reduction Potential ◽  
Earth Metal ◽  
Melting Point Determination ◽  
H Nmr ◽  
Transport Studies ◽  
Alkaline Earth Metal Ions ◽  
Point Determination ◽  
Potassium Picrate

Anthraquinone derived redox switchable ionophores 1,5 bis (2-(2-(2-ethoxy) ethoxy) ethoxy)anthracene-9,10-dione (V1) and 1,8-bis(2-(2-(2-ethoxy)ethoxy)ethoxy) anthracene—9,10-dione (V2) have been used for isolation, extraction and liquid membrane transport studies of Li+, Na+, K+, Ca2+and Mg2+metal ions. These isolated complexes were characterized by melting point determination, CV and IR,1H NMR spectral analysis. Ionophore V2shows maximum shift in reduction potential(ΔE)with Ca(Pic)2. The observed sequence for the shifting in reduction potential(ΔE)between V2and their complexes is V2calcium picrate (42 mV) > V2potassium picrate (33 mV) > V2lithium picrate (25 mV) > V2sodium picrate (18 mV) > V2magnesium picrate (15 mV). These findings are also supported by results of extraction, back extraction and transport studies. Ionophore V2complexed with KPic and showed much higher extractability and selectivity towards K+than V1. These synthetic ionophores show positive and negative cooperativity towards alkali and alkaline earth metal ions in reduced and oxidized state. Hence, this property can be used in selective separation and enrichment of metal ions using electrochemically driven ion transport.

scholarly journals Spectrophotometric and voltammetric characterization of a novel selective electroactive chemosensor for Mg2+

2013 ◽  
Vol 11 (4) ◽  
pp. 554-560 ◽  
Author(s):  
Erhan Zor ◽  
Ahmet Saf ◽  
Haluk Bingol
Keyword(s):  
Metal Ions ◽  
Alkaline Earth ◽  
High Selectivity ◽  
Earth Metal ◽  
Stoichiometric Ratio ◽  
Voltammetric Techniques ◽  
Alkaline Earth Metal Ions ◽  
Upper Rim ◽  
Voltammetric Methods

AbstractA novel azocalix[4]arene derivative, 5,11,17,23-tetrakis[(acetophenone)azo]-25,26,27,28-tetrahydroxycalix[4]arene (APC4), containing acetophenone azo groups at the upper rim was synthesized as a chemosensor. Its binding and sensing properties with alkali and alkaline earth metal ions (Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+) were investigated by UV-vis spectrophotometric and voltammetric techniques. The stoichiometric ratio and the association constant were determined spectrophotometrically as 1:1 and (1.94±0.31)×105 L mol−1 for the complex between Mg2+ and the chemosensor, respectively. Moreover, it was shown that the interaction between Mg2+ and the APC4 occurred by means of the phenol groups at the lower rim by voltammetric methods. The results of spectrophotometric and voltammetric experiments showed that the chromogenic chemosensor has high selectivity towards Mg2+ among the other used metal ions, especially the interfering Ca2+ ion.

Difference of Coordination between Alkali- and Alkaline-Earth-Metal Ions to a Symmetrical α,α′,δ,δ′-Tetramethylcucurbit[6]uril

2011 ◽  
Vol 50 (15) ◽  
pp. 6956-6964 ◽  
Author(s):  
Wen-Jian Chen ◽  
Da-Hai Yu ◽  
Xin Xiao ◽  
Yun-Qian Zhang ◽  
Qian-Jiang Zhu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Ions

Membranes for Separation of Alkali/Alkaline Earth Metal Ions: A Review

2021 ◽  
pp. 119640
Author(s):  
Yiran Wang ◽  
Wen Zhang ◽  
Xianjie Zeng ◽  
Tao Deng ◽  
Jianyou Wang
Keyword(s):  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Ions
Sign in / Sign up

Export Citation Format

Share Document