Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/20899
Título: p-tert-butyldihomooxacalix[4]arene/p-tert-butylcalix[4]arene
Transition and heavy metal cation extraction and transport studies by ketone and ester derivatives
Autor: Marcos, PM
Ascenso, JR
Segurado, MAP
Pereira, JLC
Palavras-chave: Chemistry, Multidisciplinary
Crystallography
Data: 2002
Editora: KLUWER ACADEMIC PUBL
Citação: JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY. - Vol. 42, n. 40271 (APR 2002), p. 281-288
Resumo: The binding properties of two phenylketones ( 2a and 3a) and two ethylesters ( 2b and 3b) derived from p-tert-butyldihomooxacalix[4]arene or from p-tert-butylcalix[4]arene, in the cone conformation, towards transition (Ag+, Ni2+, Cu2+, Co2+, Zn2+, Fe2+ and Mn2+) and heavy (Cd2+, Hg2+ and Pb2+) metal cations have been determined by extraction studies with metal picrates and liquid membrane transport experiments with the same salts. The affinity of these ligands for Ag+ has also been investigated by H-1 NMR spectroscopy. Both ketones are better extractants than the esters, and show a strong preference for Ag+, while Cu2+ is the most extracted cation with the esters. H-1 NMR titrations with AgSO3CF3 indicate 1 : 1 complexes for all ligands, those with ketones are more stable, on the NMR time scale, than those with esters. Both esters are good carriers for Ag+, and 2b exhibits the highest transport rate (4.7 mumol h(-1)) found until now with dihomooxacalix[4]arene derivatives.
URI: http://hdl.handle.net/10451/20899
ISSN: 0923-0750
Aparece nas colecções:FF - Produção Científica 2000-2009

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