Publication
Complexation and transport of alkali, alkaline earth, transition and heavy metal cations by p-tert-butyldihomooxacalix[4]arene tetra(diethyl)amide
| dc.contributor.author | Marcos, PM | |
| dc.contributor.author | Felix, S | |
| dc.contributor.author | Ascenso, JR | |
| dc.contributor.author | Segurado, MAP | |
| dc.contributor.author | Pereira, JLC | |
| dc.contributor.author | Khazaeli-Parsa, P | |
| dc.contributor.author | Hubscher-Bruder, V | |
| dc.contributor.author | Arnaud-Neu, F | |
| dc.date.accessioned | 2015-12-30T10:17:02Z | |
| dc.date.available | 2015-12-30T10:17:02Z | |
| dc.date.issued | 2004 | |
| dc.description.abstract | The binding properties of the tetra( diethyl) amide ( 2) derived from p-tert-butyldihomooxacalix[4]arene, in the cone conformation, towards alkali, alkaline earth, transition (Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+) and heavy (Ag+, Cd2+, Hg2+ and Pb2+) metal cations have been established by extraction studies of metal picrates from an aqueous solution into dichloromethane, transport experiments with the same salts through a dichloromethane membrane and stability constant measurements in methanol. Results concerning the calorimetric study of Na+ and K+ complexes in methanol are presented. The affinity of 2 for some cations (Na+, K+, Ba2+, Ag+ and Zn2+) has been investigated by H-1 NMR spectrometry, as well. The results are compared to those obtained with the analogous calix[4]arene tetraamide derivative 3. Amide 2 displays a preference for the alkali cations (mainly Na+ and K+) in contrast to amide 3 that prefers the alkaline earth cations. Ag+ and Cd2+ soft Lewis acids are also strongly bound by both amides. H-1 NMR titrations confirm the formation of 1: 1 complexes between 2 and all cations studied, also suggesting that they should be located inside the cavity defined by the phenoxy and carbonyl oxygen atoms. 2 shows transport rates that do not follow the same trends as the stability constants or extraction percentages; it can therefore be characterized as a selective receptor. | |
| dc.format | application/pdf | |
| dc.identifier.citation | NEW JOURNAL OF CHEMISTRY. - Vol. 28, n. 6 (2004), p. 748-755 | |
| dc.identifier.doi | http://dx.doi.org/10.1039/b401423p | |
| dc.identifier.issn | 1144-0546 | |
| dc.identifier.uri | http://hdl.handle.net/10451/20902 | |
| dc.language.iso | eng | |
| dc.publisher | ROYAL SOC CHEMISTRY | |
| dc.subject | Chemistry, Multidisciplinary | |
| dc.title | Complexation and transport of alkali, alkaline earth, transition and heavy metal cations by p-tert-butyldihomooxacalix[4]arene tetra(diethyl)amide | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 755 | por |
| oaire.citation.startPage | 748 | por |
| oaire.citation.title | NEW JOURNAL OF CHEMISTRY | por |
| oaire.citation.volume | Vol. 28 | por |
| rcaap.rights | restrictedAccess | |
| rcaap.type | article |