Chelate Compounds

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Chelate Compounds


one of the classes of complex compounds. A classical example of a chelate compound is copper glycinate:

The donor (a glycine radical of structure NH2CH2COO-) is simultaneously linked to the central atom (Cu) by two functional groups. The Cu—O bond is ionic, and the Cu—N bond is covalent. The central atom is, as it were, drawn toward the inside of the donor; hence the name of compounds of this type. Chelate compounds are characterized by low solubility in water and by anomalous colors that differ greatly for different metal ions (which has led to their extensive application in analytical chemistry as very sensitive and selective re-agents). A well-known special volumetric method of analytical chemistry, complexometry, is based on the formation of chelate compounds of various metals with polybasic amino acids, especially Trilon B (a disodium salt of ethylenediaminetetraacetic acid). The most important natural pigments, chlorophyll and hemoglobin, are chelate compounds.


Grinberg, A. A. Vvedenie v khimiiu kompleksnykh soedinenii, 3rd ed. Moscow-Leningrad, 1966.
Shvartsenbakh, G. “Kompleksometricheskoe titrovanie.” In Kompleksometriia. Moscow, 1958.
Basolo, F., and R. Johnson. Khimiia koordinatsionnykh soedinenii. Moscow, 1966. (Translated from English.)
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Shimura, "Optical rotatory dispersion and circular dichroism," in Spectroscopy and Structure of Metal Chelate Compounds, K.
: Summary: Capillary zone electrophoretic procedure has been developed for the speciation of Cr (III) and Cr (VI) along with separation from Au (III) and As (V) as chelate compounds of 2- acetylpyridine-4-phenylthiosemicarbazone (APPT).
APPT is reported to react with various cations to form stable colored chelate compounds suitable for spectrophotometric detection [30-34].
Borate buffer of pH 7 gave some mobility to the chelate compounds, but indicated poor resolution and sensitivity.
Co-developed with Ginza San Espero Omori Clinic and La Belle Vie, Inc., the new lychee-flavored beverage contains chelate compounds such as L-cystine, malic acid, methylsulfonylmethane and phytic acid, discharging poisonous metals from the body.