The base hydrolysis of coordinated fluorophosphate

Abstract

[(NH₃)₅CoO₃PF]⁺ undergoes base hydrolysis in 0.1-0.3 M NaOH, µ = 1.0, at 25ºC to generate free FPO₃^2-, F- and [(NH₃)₄Co(OH)(NH₂PO₃)] with a second-order rate constant k₂ 3.3 × 10 mol^-1 s^-1 where k₂ is the composite rate constant for FPO₃^2- release and hydrolysis of F^- with the two products being formed in approximately equal amounts. The measured rate constitutes an estimated enhancement of about 10¹⁰ over the base hydrolysis of the uncoordinated FPO₃²- ion under the same conditions when the concentration of the coordinated nucleophile is taken into account.