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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Published on: February 27, 2019

Differential response for multiple ions: a smart probe to construct optically tunable molecular logic systems.

Monaj Karar¹, Rikitha S Fernandes², Nilanjan Dey²

¹Department of Humanities and Science, MLR Institute of Technology, Hyderabad, Telangana 500 043, India.

|March 15, 2023

Summary

This summary is machine-generated.

A novel rhodamine-based optical probe detects and differentiates copper (Cu²⁺) and mercury (Hg²⁺) ions at ppb levels. This probe also enables the selective recognition of cyanide (CN^-) and iodide (I^-) ions, forming the basis for molecular logic gates.

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Area of Science:

Chemical Sensing
Molecular Probes
Supramolecular Chemistry

Background:

Development of selective and sensitive optical probes for heavy metal ion detection is crucial for environmental monitoring.
Rhodamine derivatives are widely used as fluorescent probes due to their favorable photophysical properties.
Phenanthroline motifs offer effective metal ion binding capabilities.

Purpose of the Study:

To design and synthesize a rhodamine-based optical probe for the selective detection and discrimination of Cu²⁺ and Hg²⁺ ions.
To utilize the probe for the recognition of CN^- and I^- ions.
To construct molecular logic gates based on the probe's differential responses to various ions.

Main Methods:

One-pot synthesis of a rhodamine-based probe incorporating a phenanthroline binding unit.
Spectrophotometric and fluorometric analysis for ion detection and discrimination.
Development of pre-coated Thin-Layer Chromatography (TLC) plates for on-site detection.
Construction and characterization of molecular logic gates based on opto-chemical interactions.

Main Results:

The probe exhibited a distinct pink coloration with both Cu²⁺ and Hg²⁺, and bright red fluorescence specifically with Hg²⁺.
Selective detection and discrimination of Cu²⁺ and Hg²⁺ were achieved at parts per billion (ppb) levels.
The probe successfully recognized CN^- and I^- ions.
Multiple logic gates (OR, NOR, INHIBIT, IMPLICATION, etc.) were implemented using the probe, with tunable logic responses.

Conclusions:

A versatile rhodamine-based optical probe was developed for sensitive and selective detection of multiple toxic ions.
The probe facilitates rapid on-site detection using TLC plates.
The probe serves as a platform for constructing complex molecular logic systems with switchable functionalities.