Definition of chelates (Chromium Amino Acid Chelate、 Manganese Amino Acid Chelate)

Definition of chelates (Chromium Amino Acid Chelate、 Manganese Amino Acid Chelate)

Chelate, also known as innercomplex, is a complex with a ring structure formed by bonding the central ionof the complex and two or more coordination atoms of the same ligand that meetcertain conditions. Therefore, all complexes with the above-mentioned ring structure, whether it is a neutral molecule or a charged ion, are calledchelates or internal complexes. Neutral chelates, on the other hand, are calledinternal salts. Such as [Cu(acac)2]. A few atoms on each ring of a chelate arecalled multi-element rings. Depending on the conditions under which chelatesare formed, ligands containing two or more atoms that can donate lone electronpairs are called chelating agents, and therefore, chelating agents arepolydentate ligands (also known as multibase ligands). The stability of thechelate is related to its ring structure (the size of the rings and the numberof rings). Generally speaking, it is stable with five-membered rings andsix-membered rings. Complexes with more than five or six rings are generallyunstable and rare. The greater the number of quintepy rings formed by a ligandwith a central ion, the more stable the chelate is. For example, there are fivefive-membered rings in the chelate formed by calcium ions and EDTA, so it isvery stable. Metal chelates have special stability compared to non-chelating complexes with the same coordination atoms. This particular stability is due tothe formation of an annular structure. We refer to this special stability dueto chelates as chelating effects. For example, [Ni(En)2]2+ is also quite stablein highly diluted solutions. However, [Ni(NH3)6]2+ has already precipitate dnickel hydroxide precipitates under the same conditions. When the chelates and non-chelates have the same coordination atoms and similar complex types, thechelating effect is mainly caused by the increase in entropy. It is necessaryto point out that most of the chelating agents used as ligands for chelates areorganic compounds, but there are also a very small number of inorganic compounds,such as sodium tripoly phosphate and calcium ions, which can form chelates.Since Ca2+ and Mg2+ ions can form stable chelates with sodium tripoly phosphate,sodium tripoly phosphate is often added to boiler water to prevent calcium and   magnesium from forming insoluble salt precipitation and forming on the innerwall of the boiler. The chelate has high stability and few progressive dissociations. And it generally has a characteristic color, almost insoluble inwater, but soluble in organic solvents. These characteristics can be used for precipitation, solvent extraction, separation, colorimetric quantification,etc.

Definition of chelates(Chromium Amino Acid Chelate、 Manganese Amino Acid Chelate)

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