WWRC 94-25
SERS Study of the Interaction of Alkali Metal Ions with
a Thiol-Derivatized Dibenzo-18-Crown-6
Abstract
This report demonstrates that crown ethers can be modified
with thiol functionalities and anchored to silver surfaces without
loss of activity. Once attached the responsivity of the crown
can be examined with surface-enhanced Raman spectroscopy.
The crown examined was a diaminodibenzo-18-crown-6 coupled
to mercaptoucotinic acid with DCC to form an amide. We
found that the derivitized diaminodibenzo-18-crown-6 responded
to alkali chlorides. The Kformation and selectivity were
determined and followed a trend similar to that observed in
aqueous solutions. An ionic strength test indicated that the
phenomenon was due to the cation and not the anion. However,
a larger Kformation was observed with SCN-.
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