Chelate Formation
Chelate Formation - Related Videos
01:19
Complexation Equilibria: The Chelate Effect
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2024
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...
12:24
Supported Planar Bilayers for the Formation of Study of Immunological Synapses and Kinapse
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Cited by 18 •
2008
Supported planar bilayers are powerful tools that can be used to model the molecular interactions in an immunological synapse. Here, we show methods for anchoring cell adhesion proteins known to modulate synapse formation to the upper leaflet of the lipid bilyer and visualize synapse formation using TIRF microscopy.
04:14
Establishing a Fungal-Bacterial Co-culture for Biofilm Formation
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2026
Source: Miquel Guennoc, C., et al. New Method for Qualitative Multi-scale Analysis of Bacterial Biofilms on Filamentous Fungal Colonies Using Confocal and Electron Microscopy. J. Vis. Exp. (2017)This video demonstrates the preparation of a fungal culture on treated cellophane membranes to support colony formation and radial growth. It then shows the cultivation and preparation of soil bacterial cells for interaction assays. Finally, it illustrates how bacterial cells adhere to the fungal colony...
02:16
Solution Formation
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2020
There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride. This selective solubility...
02:37
Standard Enthalpy of Formation
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2020
Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
FAQs
Greater stability is associated with a ligand’s ability to attach to the same metal ion through multiple donor atoms rather than relying on one metal–ligand contact. The resulting connected arrangement includes a ring-shaped structure, so chelation can strengthen the overall coordination complex relative to binding by comparable monodentate ligands. This distinction is central when comparing coordination behavior.
These atoms act as donor sites by sharing electron pairs with a metal ion. When two or more such sites belong to one multidentate ligand, their coordination connects the ligand to the same metal center and generates chelate rings. Their participation determines how the ligand engages the metal and helps establish the structure of the resulting coordination complex.
Ring formation shows that multiple donor atoms from one ligand are coordinated to a single metal ion. This connected structure distinguishes a chelate from separate one-point interactions and helps explain why chelated complexes often show increased stability compared with complexes formed from comparable monodentate ligands. The ring is therefore both a structural feature and a basis for interpreting relative complex stability.
Chelate formation provides a way to coordinate metal ions into complexes, allowing their presence or behavior to be examined during metal-ion analysis. The same coordination principle can support separation by changing which metal species become incorporated into chelated complexes. Thus, chelation links molecular-scale donor binding with practical control over the handling and differentiation of metal ions.
When a multidentate ligand coordinates a metal ion, the ion becomes part of a chelated complex in solution. This gives chemistry a means to control metal availability, meaning how the metal is present within the solution’s chemical system. The principle is relevant wherever managing the presence of metal ions is an experimental or chemical objective.
Beyond analytical and separation work, the coordination principle informs the design of catalysts, sensors, and therapeutic coordination compounds. In each case, multiple donor atoms and the resulting metal-containing structure provide a framework for working with metal ions. These applications show that chelation is not only a structural concept but also a tool for developing functional chemical systems.