Related Experiment Video
Updated: Feb 10, 2026
08:17
Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
Published on: July 4, 2011
15.7K
A2B corroles: Fluorescence signaling systems for sensing fluoride ions
Omprakash Yadav1, Atul Varshney1, Anil Kumar1
1Department of Applied Chemistry, Delhi Technological University, Delhi 42, India.
Summary
New corrole compounds act as highly sensitive chemosensors for detecting fluoride ions. These molecules exhibit the highest quantum yield among free base porphyrinoid systems, enabling selective fluoride detection in toluene.
Area of Science:
- Organic Chemistry
- Analytical Chemistry
- Materials Science
Background:
- Corroles are macrocyclic compounds with unique photophysical properties.
- Chemosensors are crucial for detecting specific ions in various solutions.
- Fluoride ion detection is important in environmental and industrial monitoring.
Purpose of the Study:
- To synthesize and characterize novel free base corrole derivatives.
- To evaluate the potential of these corroles as chemosensors for fluoride ions.
- To investigate the mechanism of fluorescence quenching upon fluoride binding.
Main Methods:
- Synthesis of four free base corroles (1-4) with varying substituents.
- Characterization using spectroscopic techniques (e.g., NMR, Mass Spectrometry).
- Fluorescence spectroscopy to study the interaction with fluoride ions in toluene.
Main Results:
- Successful synthesis and characterization of four new corrole compounds.
- Demonstrated selective and sensitive detection of fluoride ions in toluene.
- Corroles exhibited the highest quantum yield among known free base porphyrinoid systems.
- Fluorescence quenching observed, attributed to static and dynamic factors.
Conclusions:
- The synthesized corroles are effective chemosensors for fluoride ion detection.
- The high quantum yield and fluorescence quenching mechanism provide a basis for sensitive detection.
- These findings open avenues for developing advanced sensor materials.
Related Concept Videos
03:27Ions and Ionic Charges
79.3K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
79.3K
02:54Trends in Lattice Energy: Ion Size and Charge
26.8K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
26.8K
01:19Ion Channels
91.5K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.5K
02:57The Sense of Self: Reflected Self-Appraisal and Social Comparison
56.1K
According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
56.1K
03:24Common Ion Effect
47.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
47.0K
03:11Precipitation of Ions
30.3K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
30.3K