ISSN:
1573-1111
Keywords:
Calix[4]arene
;
Na+ selective ionophore
;
lower rim bridged calix[4]arene
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Six kinds of tetra alkylester type calix[4]arene derivatives, (R1=R2=CH3∶1, C2H5∶2, C3H7∶3,n-C4H9∶4,t-C4H9∶5,n-C10H21∶6), a diethyl-didecyl mixed ester type (R1=C2H5, R2 =C10H21∶7), and three kinds of lower rim bridged types (R1=C2H5, R2−R2=―(CH2)10―∶8, ―(CH2)12―∶9, ―(CH2)2(OCH2CH2)3―∶10) were characterized by electrochemical measurement to elucidate the effect of the length of the alkyl group of alkoxycarbonyl substituents on Na+ selectivity. To obtain excellent Na+ selective ionophores, introduction of short chain alkyl groups rather than long chain ones, such as a decyl group, and maintenance of sufficient solubility of the calix[4]arene derivatives in the membrane solvent are required concurrently. Among the calix[4]arenes tested, 25,26,27,28-tetrakis[(ethoxycarbonyl)methoxy]-p-tert-butylcalix[4]arene2, and the diethyl-didecyl mixed ester type derivative7 are the best ionophores for a Na+ selective electrode. On the other hand, sodium selectivity of the bridged type derivative9 is comparable or even superior to that of the known bis(12-crown-4).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00708991
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