Synthesis and Extraction Studies of a Versatile Calix[4]arene-Based "Proton-switchable Extractant" for Toxic Metals and Dichromate Anions
Yükleniyor...
Dosyalar
Tarih
2003
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The article describes the syntheses and extraction properties of a new calixarene based extractant 5, which has been synthesized from 5,11,17,23-tetra-tert-butyl-25,27-bis(chlorocarbonyl-methoxy)-26,28-dihydroxycalix[4]arene (4) by treatment with isoniazid (isonicotinic acid hydrazide) in the presence of pyridine. The compound 5 was converted to its methyl iodide salt (6) by refluxing 5 with methyl iodide in acetonitrile. In this synthesis it was thought to explore the role of pyridinium sites in the extraction of HCr2O7-/Cr2O72- anions. The complexing properties of 5 toward selected alkali/transition metal cations and HCr2O7-/Cr2O72- anions are reported. It has been observed that receptor 5 does not extract alkali metal cations but shows an excellent selectivity toward transition metals. The protonated pyridinium form of 5 is an effective form for transferring the HCr2O7-/Cr2O72- anions from an aqueous into a dichloromethane layer.
Açıklama
Anahtar Kelimeler
Calixarene, Solvent extraction, Alkali and transition metals, Dichromate anions
Kaynak
Journal of Inclusion Phenomena and Macrocyclic Chemistry
WoS Q Değeri
Q2
Scopus Q Değeri
Q3
Cilt
45
Sayı
3-4
Künye
Tabakcı, M., Memon, S., Yılmaz, M., Roundhill, D. M., (2003). Synthesis and Extraction Studies of a Versatile Calix[4]arene-Based "Proton-switchable Extractant" for Toxic Metals and Dichromate Anions. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 45(3-4), 265-270.
