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Related Concept Videos

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...

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Related Experiment Video

Updated: Jul 12, 2026

Bridging the Bio-Electronic Interface with Biofabrication
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Published on: June 6, 2012

Electro-optical evidence for the chelate effect at semiconductor surfaces.

G C Lisensky, R L Penn, C J Murphy

    Science (New York, N.Y.)
    |May 18, 1990
    PubMed
    Summary

    Amine adsorption enhances semiconductor photoluminescence (PL), allowing measurement of surface changes. This technique characterizes semiconductor surfaces and molecular interactions using PL intensity.

    Area of Science:

    • Materials Science
    • Surface Chemistry
    • Photochemistry

    Background:

    • Semiconductor surface properties influence electronic and optical behavior.
    • Photoluminescence (PL) is sensitive to surface conditions.
    • Amine adsorption can modify semiconductor surfaces.

    Purpose of the Study:

    • To investigate the effect of amine adsorption on n-type cadmium sulfide (n-CdS) and n-type cadmium selenide (n-CdSe) photoluminescence.
    • To utilize PL changes to quantify semiconductor surface properties and amine-surface interactions.
    • To explore the role of chelation in amine-semiconductor interactions.

    Main Methods:

    • Immersion of n-CdS and n-CdSe substrates in amine-cyclohexane solutions.
    • Measurement of band-edge photoluminescence (PL) intensity changes upon amine adsorption.

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  • Analysis of PL intensity dependence on amine concentration to determine depletion width and adduct formation constants.

    • Main Results:

    • Monoamines and diamines reversibly enhanced the PL intensity of n-CdS and n-CdSe.
    • PL enhancement correlated with amine-induced contractions in the semiconductor depletion width.
    • Ethylenediamine and o-phenylenediamine showed distinct behavior, suggesting chelation to surface Cd(2+) ions.
    • Adduct formation constants were estimated from PL intensity versus concentration data.

    Conclusions:

    • Photoluminescence is a viable contactless, in situ technique for characterizing semiconductor surface landscapes.
    • The study correlates molecular properties of amines with their interactions at semiconductor surfaces.
    • PL measurements provide insights into steric and electronic effects at the semiconductor-amine interface.