Hong-Seok Kim, seon-yun Bae, Ki Soo Kim
2008
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0
Influential Citations
2
Citations
Journal
Bulletin of The Korean Chemical Society
Abstract
The efficient synthesis of four mesitylene-based receptors 1-4 and their potentiometric response characteristics to alkali metal, alkaline earth metal, and transition metal ions, under various pH conditions are outlined. Receptor 1-based electrode exhibited more sensitive response to Ag + ion (49 mV/decade of range from 10 -6 to 10 -2 M) than the 2-based electrode (47 mV/decade of range from 3 x 10 -5 to 10 -2 M), while the 3- and 4-based ones revealed sub-Nemstian below 40 mV/pAg + . All electrodes showed substantial responses to Ag + ion under acidic condition, but there was almost nil-response to other transition metal ions (Fe 2+ , Co 2+ , Zn 2+ , Ni 2+ , Pb 2+ , Cd 2+ , Cu 2+ and Hg 2+ ). The association constant of receptor 1 toward Ag + ion, measured by 1 H NMR titration, showed the largest value (200 M -1 ) among the tested receptors. The results were interpreted with semi empirically-modeled structures.