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Three novel 25,27-dihydroxy-26,28-bis(3-benzylselenopropoxy)-5,11,17,23-tetra-tert-butylcalix[4]-arene (2), 25,27-dihydroxy-26,28-bis[3-(2-hydroxyethylseleno)propoxy]-5,11,17,23-tetra-tert-butyl-calix[4]arene (3) and 25, 27-dihydroxy-26,28-bis(3-propylselenopropoxy)-5,11,17,23-tetra-tert-butyl-calix[4]arene (4) were synthesized for the comparison of their ion-selectivity in ion-selective electrodes (ISE). X-ray structure of the CH/π complex of 4?CH2Cl2 was elucidated. ISEs based on 2—4 as neutral ionophores were prepared, and their selectivity coefficients for Ag+ (log KAg,M ) were investigated against some main group metal ions and transition metal ones using the fixed pot interference method (FIM). These ISEs showed excellent Ag+ selectivity over most of the interfering cations ex- amined. It is evident that the stronger Hg2+ interference may not be produced while hard donors (hydroxy) are close to the soft selenium donors.
Three novel 25,27-dihydroxy-26,28-bis (3-benzylselenopropoxy) -5,11,17,23-tetra-tert- butylcalix [4] -arene -bis [3- (2-hydroxyethylseleno) propoxy] -5,11,17,23-tetra-tert-butyl-calix [4] arene (3) and 25,27-dihydroxy-26,28- propylselenopropoxy) -5,11,17,23-tetra-tert-butyl-calix [4] werene (4) were synthesized for the comparison of their ion-selective ion-selective electrodes ISEs based on 2-4 as neutral ionophores were prepared, and their selectivity coefficients for Ag + (log KAg, M) were investigated against some main group metal ions and transition metal ones using the fixed These ISEs showed excellent selectivity for Ag + selectivity over most of the interfering cations ex-amined. It is characterized that the stronger Hg2 + interference may not be produced while hard donors (hydroxy) are close to the soft selenium donors.