Abstract
A series of ethyl acetate (nBP-Es) and trioxyethylene ether (nBP-OE) derivatives of linear all-ortho methylene-linked oligomers of p-tert-butylphenol (n = 1–7) were prepared, and cation extraction properties were determined. For alkali metal cations, nBP-Es showed the affinity, and especially 5BP-Es showed the selectivity for Na+. On the other hand, nBP-OE also showed sufficient affinity; however, the extraction behavior was completely different from that of nBP-Es, that is, the affinity of even membered BP-OE was higher than that of the odd membered. nBP-Es extracted cations by forming a cavity winding around them, while nBP-OE extracted with two trioxyethylene chain picking up cations. For alkaline earth metal cations, nBP-Es extracted more than that for alkali cations. Particularly, 7BP-Es showed the highest affinity for larger cations, Sr2+ and Ba2+, among phenolic oligomers and 18-crown-6 compound. On the other hand, nBP-OE showed a lower affinity than that for alkali cations. It was concluded that the linear phenolic oligomers extracted alkali and alkaline earth metal cations and the kind of ion ligand introduced influenced the affinity and the selectivity. © 1996 John Wiley & Sons, Inc.
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