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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 3
BKCSDE 32(3)
March 20, 2011 

Novel Silver(I) Ion Selective PVC Membrane Electrode Based on the Schiff Base (N2E,N2'E)-N2,N2'-Bis(Thiophen-2-ylmethylene)-1,1'-Binaphthyl-2,2'-Diamine
Eunseon Jeong, Mohammad Shamsuddin Ahmed, Haesang Jeong, Eunhee Lee, Seungwon Jeon *
Schiff base, Silver-ion selective electrode, Potentiometry, Ionophore, PVC membrane
A potentiometric sensor based on the Schiff base (N2E,N2'E)-N2,N2'-bis(thiophen-2-ylmethylene)-1,1'- binaphthyl-2,2'-diamine has been synthesized and explored as an ionophore PVC-based membrane sensor selective for the silver (Ag+) ion. Potentiometric investigations indicate a high affinity of this receptor for the silver ion. Seven membranes have been fabricated with different compositions, with the best performance shown by the membrane with an ionophore composition (w/w) of: 1.0 mg, PVC: 33.0 mg, DOA: 66.0 mg in 1.0 mL THF. The sensor worked well within a wide concentration range of 1.0 × 10−2 to 1.0 × 10−7 M, at pH 5, at room temperature (slope 57.4 mV/dec.), and with a rapid response time of 9 s; the sensor also showed good selectivity towards the silver ion over a huge number of interfering cations, with the highest selectivity coefficient for Hg2+ at −3.7. Thus far, the best lower detection limit was 4.0× 10−8 M.
800 - 804
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