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phenylhydrazine and salicylaldehyde, which displayed a high
selectivity for Pb2+ ion in 1:1 (v:v) CH3OH:H2O at excitation
wavelength 410 nm. This excitation wavelength is much
higher than the UV/Visible absorption peaks of the probe.
The interaction between the probe and Pb2+ ion results the
high fluorescence intensity. The presence of the other metal
ions in the solution does not offer any hindrance to the en-
hancement in the fluorescence intensity. The remarkable in-
crease in the fluorescence intensity of ca 100 times on
interaction with Pb2+ was accompanied by a blue shift in the
emission spectra. A 1:1 complexation between L and Pb2+ ion
is proved to be formed which snaps the PET process in L
leading to fluorescent enhancement.
Acknowledgment UGC, New Delhi and DST, New Delhi are
thanked for financial support to the Department. PG thanks the former
for fellowship under RFSMS.
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