Communication
RSC Advances
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Scheme 2 (a) General representation of the symbol of an INHIBIT gate (formal
combination of a NOT, YES and AND gate); (b) the corresponding truth table of this
logic gate; (c) the output signals of this logic gate in the presence of different inputs.
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also showed a reversible shift (upfield to downfield) with the
addition of Al3+ and then PPi. From this study we concluded that
RIH has a strong affinity towards the Al3+ ion and RIH–Al3+
behaves as a good ensemble for the selective recognition of PPi.
In this case, the behavior of RIH mimics the INHIBIT gate
which can be integrated24 by combining a NOT, a YES, and an
AND gate (Scheme 2). In this logic gate, Al3+ and PPi are used as
inputs. For the input, the presence of Al3+ and PPi are defined as a
‘‘1’’ state and the absence of the molecules define the ‘‘0’’ state.
One of them i.e. Al3+ in this case, should lead to absorption and
fluorescence in its occupied state, equivalent to a YES operation
(input 1, Scheme 2). The interaction of the other input i.e. PPi in
this case (input 2, Scheme 2) with its corresponding receptor
should lead to absorption and fluorescence quenching, thereby
implementing the necessary NOT gate. The receptor i.e. RIH
(occupied or free) acts in parallel on the absorption and
fluorescence output signal, which implements the required AND
function. In the presence of both inputs, the quenching (by input
2) should override the absorption and fluorescence enhancement
by input 1, in accordance with the truth table shown in Scheme 2.
In conclusion, a new rhodamine probe bearing an isatin
moiety (RIH) has been synthesized for the selective detection of
Al3+ in aqueous solution. The RIH–Al3+ complex was utilized as a
fluorescence chemosensor for PPi. The ‘‘off–on–off’’ behavior of the
RIH towards Al3+ and PPi is also mimicking the INHIBIT logic
gate.
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The authors thank the DST and CSIR (Govt. of India) for
financial support. S. P. and A. M. acknowledge the UGC and CSIR,
respectively, for providing fellowships.
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