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Related Concept Videos

Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Solution Composition During Acid/Base Titrations01:17

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The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
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Common Ion Effect

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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:
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Classifying Matter by Composition03:35

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Copper Ion Fluorescent Probe Based on Zr-MOFs Composite Material.

Jing Chen1, Haiyong Chen1, Tiansheng Wang1

  • 1Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China.

Analytical Chemistry
|March 12, 2019
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Summary

A new metal-organic framework (MOF) probe detects copper ions (Cu2+) with high sensitivity. This novel sensor offers reliable environmental monitoring and surpasses World Health Organization standards for drinking water.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer tunable properties for sensing applications.
  • Developing sensitive and selective probes for heavy metal detection is crucial for environmental safety.
  • Porphyrin-based MOFs (PCNs) exhibit unique photophysical properties suitable for fluorescence sensing.

Purpose of the Study:

  • To develop a novel ratiometric fluorescent probe for sensitive and selective detection of copper ions (Cu2+).
  • To utilize a composite MOF structure for enhanced stability and built-in correction capabilities.
  • To establish a reliable platform for Cu2+ determination in environmental and biological samples.

Main Methods:

  • Synthesis of a composite MOF by encapsulating UiO-66(OH)2 within a porphyrin MOF (PCN-224).
  • Characterization of the composite MOF's structure and fluorescence properties.
  • Evaluation of the probe's selectivity and sensitivity towards Cu2+ through fluorescence quenching experiments.

Main Results:

  • The composite MOF probe exhibited excellent fluorescence performance with distinct green and red emission signals.
  • UiO-66(OH)2 served as an internal reference, correcting for environmental interferences.
  • The probe demonstrated selective quenching of PCN-224 fluorescence by Cu2+, enabling ratiometric detection.
  • A low limit of detection (LOD) of 0.068 nM for Cu2+ was achieved, surpassing WHO drinking water standards.

Conclusions:

  • The developed ratiometric MOF probe provides a highly sensitive and reliable method for Cu2+ detection.
  • The built-in correction mechanism enhances the probe's robustness in complex matrices.
  • This sensor has significant potential for real-time monitoring of copper ions in environmental and biological systems.