Polymer supported calix[4]arene Schiff bases: A novel chelating resin for Hg2+ and dichromate anions
Yükleniyor...
Tarih
2005
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
TAYLOR & FRANCIS INC
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This article describes the synthesis and characterization of two new calix[4] arene Schiff bases and their polymeric resins. The extraction properties of these "proton switchable extractants" with alkali, transition, post transition metal cations and for dichromate anions are reported. The two new calix[4] arene based Schiff bases (5 and 6) have been synthesized from 5,17-diformyl-25,27-dipropoxy-26,28-dihydroxycalix[4]arene (4) by treatment with 3-amino-methylpyridine and 1,8-diaminooctane in two separate reaction flasks following the same procedure. Compounds 5 and 6 have been appended to a polymeric resin by treatment with Merrifield resin through a nucleophilic substitution reaction. The receptor compounds (3 and 5-8) do not extract alkali metal cations, but show some selectivity toward transition metal cations, and a particularly high selectivity to Hg2+ and Pb2+. The protonated forms of all of the calixarene-based receptors are good extractants for transferring Cr2O72-/HCr2O7- anions from an aqueous into a dichloromethane layer.
Açıklama
Anahtar Kelimeler
calix[4]arene, Merrifield resin, Schiff base, proton-switchable, dichromate anions, solvent extraction
Kaynak
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
A42
Sayı
6
