SciELO - Scientific Electronic Library Online

 
vol.49 issue4VANADIUM(III) COMPLEXES IN AQUEOUS SOLUTION WITH THE DICARBOXYLIC OXALIC, MALONIC AND SUCCINIC ACIDS author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

CACERES, PABLO J; COSTAMAGNA, JUAN; DE NAMOR, ANGELA DANIL  and  MATSUHIRO, BETTY. LOWER RIM p-TERT-BUTYLCALIX[4]ARENE DERIVATIVES CONTAINING GALACTITOL PENDANTS: COMPLEXATION OF 5,11,17,23-TETRAKIS-(1,1-DIMETHYLETHYL)-25,27-DIHYDROXY -26,28-BIS-2-N-(1-DEOXY-D-GALACTITYL)-AMINOETHOXYCALIX[4]ARENE WITH Pb(II) AND F(-I). J. Chil. Chem. Soc. [online]. 2004, vol.49, n.4, pp.281-284. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072004000400002.

Reductive amination of D-galactose with the bisubstituted p-tert-butylcalix[4]arylethylamine in the presence of sodium cyanoborohydride allowed the introduction of one or two galactitol residues as pendants on the lower rim. The bisubstituted secondary amine, 5,11,17,23-tetrakis-(1,1-dimethylethyl)-25,27-dihydroxy-26,28-bis-2-N-(1-deoxy-D-galactityl)-aminoethoxycalix[4]arene (III) was obtained in 24.1% yield. Complexation of this compound with Pb (II) and F(-I) was studied by 1H-NMR and spectrophotometric titration in acetonitrile, showing a stoichiometry of 1:2 (ligand:ion) with equilibrium constants of log K1=2.22 ± 0.08 and log K2=2.07 ± 0.07 for Pb(II), and log K1=1.21 ± 0.05 and log K2=1,17 ± 0.04 for F (-I) ion

Keywords : calix-sugars; galactitol derivatives of calix[4]arenes; ligands; complexation.

        · text in English

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License