Abstract
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 CaII and CuII has been investigated by potentiometry at 25 °C, I= 0.1 mol dm–3(K[NO3]). 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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