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Phosphonate Complexes. Part 6. Influence of Steric Effects, Solvation, and Chelation on Stability

DOI: 10.1039/DT9810002423

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2423 - 2428 (1981)

Update date:2022-08-17

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Authors:

Wozniak, MichelWozniak, Michel

Nowogrocki, GuyNowogrocki, Guy

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Article abstract of DOI:10.1039/DT9810002423

The interaction of some phosphonic acids RPO(OH)2, chosen to introduce different controlling factors (R=But, cyclo-C6H11, pH, n-C10H21, Me2NCMe2, CH2SEt, CH2CH2CO2(-)), with Ca(II) and Cu(II) has been investigated by potentiometry at 25 deg C, I=0.1 mol dm-3 (K).The selection of the species and the refinement of the stability constants illustrates the applicability of a new version of the program MUCOMP.Examination of linear free-energy plots indicates that factors other than polar effects are of significance, i.e. chelate formation with the potentially bidentate ligands and particularly solvation effects which preferentially stabilize the complexes of α- branched-chain phosphonates.Other features (steric hindrance, predominance of some microscopic forms) are discussed.

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