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Hard and soft porphyrins: equilibrium constants for Cd²⁺ and Pb²⁺ with water-soluble free base porphyrins

RAY HALL SELF

Department of Chemistry, Howard University, Washington, DC 20059, USA

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and

P. HAMBRIGHT

Department of Chemistry, Howard University, Washington, DC 20059, USA

Corresponding author: Department of Chemistry, Howard University, Washington, DC 20059, USA.

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https://doi.org/10.1002/(SICI)1099-1409(200004/05)4:3<256::AID-JPP204>3.0.CO;2-VCited by:4 (Source: Crossref)

Abstract

Equilibrium constants (1:1) for the reactions of cadmium(II) and lead(II) with water-soluble free base porphyrins of differing basicities (pK₃) are reported. Soft porphyrins with low pK₃ values favor the softer Cd(II), while harder porphyrins with higher pK₃ values have more affinity for the relatively harder Pb(II) ion.

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