LOWER RIM ALKYLAMMONIUM-SUBSTITUTED CALIX[4]ARENES AS PROTON-SWITCHABLE EXTRACTANTS FOR CHROMATE AND DICHROMATE ANIONS

Authors
GEORGIEV EM WOLF N ROUNDHILL DM
Citation
Em. Georgiev et al., LOWER RIM ALKYLAMMONIUM-SUBSTITUTED CALIX[4]ARENES AS PROTON-SWITCHABLE EXTRACTANTS FOR CHROMATE AND DICHROMATE ANIONS, Polyhedron, 16(9), 1997, pp. 1581-1584
Citations number
15
Categorie Soggetti
Chemistry Inorganic & Nuclear",Crystallography
Journal title
Polyhedron → ACNP
ISSN journal
02775387
Volume
16
Issue
9
Year of publication
1997
Pages
1581 - 1584
Database
ISI
SICI code
0277-5387(1997)16:9<1581:LRACAP>2.0.ZU;2-2
Abstract
The compound 27-bis(2-aminoethoxy)-26,28-dihydroxycalix[4]arene (2) ha s been synthesized by the borane reduction of 5,11, -26,28-dihydroxyca lix-26,28-dihydroxycalix[4]arene (1). The protonated alkylammonium for m of 2 is an effective extractant for transferring the anions CrO42- a nd Cr2O72- from an aqueous into a chloroform layer. The monoanions Cl- , CH3CO2- and NO3-, and dianions SO42-, MoO42- and WO42- have little e ffect on the extraction of CrO42- and CrO72-. Deprotonation of the dia lkylammonium cation results in reversal with CrO42- and Cr2O72- migrat ing back into the aqueous layer. (C) 1997 Elsevier Science Ltd.