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Selective Complexation of Hg2+ by Biscalix[4]arene Nitriles
(Marcel Dekker Inc, 2000) Memon, Shahabuddın; Uysal, Gülderen; Yılmaz, Mustafa
Ionophoric biscalix[4]arenyl nitriles in which the lower rims are linked via a single site on each calixarene were synthesized. Their complexing abilities were studied by the liquid-liquid extraction of alkali (Li+, Na+, K+, and Cs+) and selected transition metal (Cu2+, Co2+,Cd2+, Ni2+, and Hg2+) cations. We found a novel selectivity of these compounds toward Hg+2 cations through examination of the extraction.
Synthesis and Comparative Complexation Studies of Schiff Base Derivatives of p-Tert Butylcalix[4]arene Copolymers
(Marcel Dekker Inc, 2000) Memon, Shahabuddın; Yılmaz, Aytan; Yılmaz, Mustafa
Two different Schiff base derivatives of p-tert butylcalix[4]arene 3, 6 in which one of them carrying two oxime groups, while the other has a 1,8-octylenediimino bridge, are synthesized. Treatment of these monomers with triethylene ditosylate provided corresponding copolymers 5, 7. Their complexing properties with selected alkali and transition metals are reported here. It has been concluded that the binding ability of Schiff base-calix-arene derivatives in transferring the metal cations is due to the presence of soft pi-donor systems in the macrocyclic structure.