Synergistic extraction of sodium and potassium picrates with mixture of c-methyl calix[4]resorcinarene and 4’ –amino-benzo-15-crown-5
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VERZIU, Cezar. Synergistic extraction of sodium and potassium picrates with mixture of c-methyl calix[4]resorcinarene and 4’ –amino-benzo-15-crown-5. In: International Conference of Young Researchers . Ediția 8, 11-12 noiembrie 2010, Chişinău. Chişinău: Tipogr. Simbol-NP SRL, 2010, p. 80. ISBN 978-9975-9898-4-8..
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International Conference of Young Researchers
Ediția 8, 2010
Conferința "International Conference of Young Researchers "
Chişinău, Moldova, 11-12 noiembrie 2010

Synergistic extraction of sodium and potassium picrates with mixture of c-methyl calix[4]resorcinarene and 4’ –amino-benzo-15-crown-5


Pag. 80-80

Verziu Cezar
 
Universitatea Politehnică din Bucureşti
 
Disponibil în IBN: 5 mai 2021


Rezumat

This paper presents extraction behaviour of sodium and potassium picrates from aqueous phase to an organic phase( chloroform ) using three types of extractants: 4’aminobenzo-15- crown -5 ( fig.1) C -methyl calix[4]resorcinarene(fig.2), and an equimolecular mixture of both supramolecular compounds. Variation of concentration of extractants in aqueous phase was also examined. The concentrations of sodium and potassium cations from chloroform solution were determined by the concentrations of picrates from aqueous phase.All macrocyclic ligands show a moderate affinity for sodium and potassium cations. The extractability is given by equation: %E= [M]+ org/[.M]+ aq. initial.100 The percent of extractability can be determined from the absorbance spectra according to equation: %E= Ai-Af/Ai.100 For all examined concentrations, C- methyl calix[4]resorcinarene exhibit a poor extractability for both cations. For equimolecular mixture of extractants it was found a synergistic extraction : %Ecalixarene+ %E crown-ether< %Ecalixarene-crown ether mixture. In the extraction process, 4’aminobenzo-15- crown -5 forms charged complex with cations , and then associate with C- methyl calix[4]resorcinarene through π- π stacking interactions and hydrogen bonds.

Cuvinte-cheie
picrates, Calixarenes, crown –ethers, synergistic extraction

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