Relationship between extraction properties and transport through liquid membrane of amino acids by calixarene derivatives

2978-2981The relationship between the extraction ability of p-tert-butylcalix[n]arenes (n=6,8) upon some amino acid methylesters and their transport through chloroform liquid membrane in the presence of tropaeolin 00 ([4-(4'-anilinophenylazo) benzene sulphonic acid]) at pH = 5.0 has been investigated. Our results highlight that both the extractability and the transport of amino acid methylesters are essentially controlled by the structure of calixarene, the nature of amino acid, and the nature of the anion used as ion pair for cation-receptor complexes. Also the relationship between the extractability of these complexes and the structure of amino acids under study have been discussed

The Synthesis of New Triazole Ligands and Determination of Complex Stability Constants with Transition Metal Cations in Aqueous Media

WOS: 000260045800002Six new triazole compounds were synthesized. These compounds containing the substituted benzylidenamino group were obtained by reaction of 3-(pyridine-4-yl)-5-p-tolyl-4-amino-4H-1,2,4-triazole 1 with the corresponding aldehyde. The reduced forms were prepared with NaBH4 in methanol. The structures of the compounds were determined by IR, H-1 NMR, and C-13 NMR spectral data, and their interaction with cations such as Li+, Na+, K+, Rb+, Cs+, Ba2+ Sr2+, Ca2+, Cu2+, Cr3+, Co2+, Ni2+, Zn2+, Cd2+, Pb2+ and Ag+ were investigated by using UV-visible spectrophotometry. Of the tested metal cations, Cu2+, Cr3+, Co2+, Ni2+, Zn2+, Cd2+, Pb2+ and Ag+ complexed with the ligands. The complex stability constants (log(10) K) were measured in slightly acidic aqueous media at 25.0 +/- 0.1 degrees C. These stability constants were determined by measuring the increase in solubility of the nearly insoluble ligand molecule due to complex formation with a soluble cation, and this method is discussed. It was found that the position of chlorine atoms on the benzene ring strongly affects the complexation of Cu2+ ion with these ligands.Deutsches Textilforschungszentrum Nord-West; Scientific and Technical Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)The authors thank the Deutsches Textilforschungszentrum Nord-West and The Scientific and Technical Research Council of Turkey (TUBITAK) for the financial support of this study

Enantioselective transport of some amine compounds through liquid membranes

Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal