Here, naphthalene
diamine-based β-diketone derivative (compound
LH) was successfully used as a dual signaling probe for divalent cations,
Fe
2+
and Cu
2+
ions, in bimodal methods (colorimetric
and fluorometric). It showed fluorescent enhancement for Fe
2+
ion by photoinduced electron transfer mechanism and fluorescence
quenching for Cu
2+
ion by charge-transfer process. Binding
stoichiometry for [LH–(Fe
2+
)
2
] and [LH–(Cu
2+
)
2
] was found to be 1:2 by Job’s plot method
and, the binding constants were calculated as 1.6638 × 10
10
and 9.22929 × 10
8
M
–1
,
respectively. Compound LH exhibited OR and XOR logic gate behavior
with H
+
, Fe
2+
, and Cu
2+
as inputs.
Further, the compound LH and bovine serum albumin binding interaction
showed quenching of fluorescence by Förster resonance energy-transfer
mechanism.
We report the first antipyrine-derived fluorescent chemosensor for highly selective and sensitive detection of vanadyl ions by an inhibited PET mechanism, with DFT studies.
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