Abstract of Paper Presented at the Symposium on Metal ChelateChemistry at Brooklyn Polytechnic Institute on April 26, 1952 Page: 4 of 10
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1. Direct measurement by titration (pH or Redox).
2. Direct determination of the concentration of species from
3. Relative and absolute determination by polarigraphic
4. Relative and absolute determination from exchange rates,
using isotopic metal ions.
5. Competition between two chelating agents for the same
a. In one phase
b. In two liquid phases (extraction equilibrium).
c. In one liquid and one solid phase (ion exchange
As a result of a general survey of the stability of complex compounds, it is
possible to set down the number of factors which influence the stability of all
complex compounds, irrespective of whether they be chelates or not. They may be
divided into properties of the central metal atom, such as charge-radium ratios
and available orbitals, and properties of the complex group, such as polarizability,
size and basicity. In addition to these, however, there are a number of character-
istics found uniquely in chelate compounds. These are:
1. Steric effects involving the size and shape of the chelate
2. Entropy effects arising from differences in the number of
particles on either side of the chelation equilibrium (or
expressed otherwise, in terms of the necessity for simul-
taneous making or breaking of two or more ligends).
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Calvin, Melvin. Abstract of Paper Presented at the Symposium on Metal ChelateChemistry at Brooklyn Polytechnic Institute on April 26, 1952, report, April 1, 1952; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc882357/m1/4/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.